CN111294917A - Method, apparatus, storage medium and user equipment for estimating timing offset based on PDCCH - Google Patents

Abstract

A method, device, storage medium and user equipment for estimating timing offset based on PDCCH, the method for estimating timing offset based on PDCCH includes: receiving frequency domain data of a PDCCH wideband demodulation reference signal; The frequency domain channel estimation value sequence is obtained by performing correlation calculation on the signal sequence; the frequency domain channel estimation value sequence is transformed into a time domain channel estimation value sequence; the final main path position is determined based on the time domain channel estimation value sequence; the final main path position and the target The timing is compared to obtain the timing offset. The technical solution of the present invention can estimate the timing deviation more timely and accurately.

Description

Method, apparatus, storage medium and user equipment for estimating timing offset based on PDCCH

technical field

The present invention relates to the field of communication technologies, and in particular, to a method, device, storage medium and device for estimating timing offset based on PDCCH in an NR system.

Background technique

The LTE (Long Term Evolution) system refers to a long-term evolution system dominated by 3GPP, and its network architecture includes an access network (Evolved-UMTS Terrestrial Radio Access Network, referred to as E-UTRAN) part and a core network (Evolved Packet Core, referred to as EPC) )part. The NR (New Radio) system refers to the fifth-generation mobile communication system dominated by 3GPP. Its network architecture includes an access network (Next-Generation Radio Access Network, referred to as NG-RAN) and a core network (5G Core Network, referred to as 5GC) section.

Quasi Co-Location (Quasi Co-Location, QCL for short) concept is introduced in both the LTE system and the NR system. Specifically, if one antenna port and other antenna ports are configured as QCL, it means that user equipment (User Equipment, UE for short) can assume that the signal received from one antenna port (or the channel corresponding to the antenna port) is Large-scale properties are the same in whole or in part as signals received from other antenna ports (or channels corresponding to antenna ports). Large-scale properties include Doppler spread, Doppler shift, and timing offset correlation. Average delay, delay spread, average gain, etc.

In the NR system, four types of QCLs are provided, namely QCL-TypeA, QCL-TypeB, QCL-TypeC and QCL-TypeD, wherein QCL-TypeA and QCL-TypeC contain timing information. For example, when the Physical Downlink Control Channel (PDCCH for short) and a reference signal (Reference Signal, RS for short) are configured as QCL-TypeA or QCL-TypeC, the timing offset estimated by the reference signal is used. Also applies to PDCCH.

However, the timeliness and accuracy of the timing offsets estimated by these reference signals may be poor in some scenarios.

SUMMARY OF THE INVENTION

The technical problem solved by the present invention is how to estimate the timing deviation of the channel timely and accurately.

In order to solve the above technical problem, an embodiment of the present invention provides a method for estimating timing offset based on PDCCH in an NR system. The method includes: receiving frequency domain data of a PDCCH demodulation reference signal, wherein the PDCCH demodulation reference signal is configured as a wideband demodulation reference signal. The frequency domain channel estimation value sequence is obtained by performing correlation calculation between the received frequency domain data and the UE local PDCCH demodulation reference signal sequence corresponding to the PDCCH demodulation reference signal; domain channel estimation value sequence; in the time domain channel estimation value sequence, select the main path with the maximum received power of each receiving antenna at the UE, and determine the position with the most occurrences in the main path as the final main path position; the final main path position The difference obtained by comparing with the target timing saved at the UE is determined as the timing offset of the PDCCH.

Optionally, the timing of the UE is adjusted based on the timing offset of the PDCCH.

Optionally, in the time-domain channel estimation value sequence, selecting the main path with the maximum received power of each receiving antenna at the UE includes: selecting the main path with the maximum received power of each receiving antenna through the respective multipath windows of each receiving antenna. The multipath window is a numerical range related to the number of IFFT points.

Optionally, the number of IFFT points is 256, the length of the multipath window is set to 64 points, and the numerical range is between 1 and 32 and between 225 and 256.

Optionally, the PDCCH demodulation reference signal is configured as a wideband demodulation reference signal by setting the CORESET parameter precoderGranularity of the PDCCH to allContiguousRBs.

Optionally, the received frequency domain data and the UE local PDCCH demodulation reference signal sequence corresponding to the PDCCH demodulation reference signal are correlated and calculated to obtain the frequency domain channel estimation value sequence: The data and the UE local PDCCH demodulation reference signal sequence corresponding to the PDCCH demodulation reference signal are conjugated multiplied to obtain the frequency domain channel estimation value sequence. The correlation formula is:

H_cch_dmrs(l,rx,m)=R_cch_dmrs(l,rx,m)*conj(local(l,m)),

Among them, H_cch_dmrs(l,rx,m) is the frequency domain channel estimation value sequence, R_cch_dmrs(l,rx,m) is the received frequency domain data, local(l,m) is the UE local PDCCH demodulation reference signal sequence, l is a symbol, rx is a receiving antenna parameter, and m is a physical resource block parameter.

Optionally, there is no reference signal with PDCCH QCL-TYPEA or QCL-TYPEC in the time slot where the PDCCH is located.

Optionally, there is a reference signal with PDCCH QCL-TYPEA or QCL-TYPEC in the time slot where the PDCCH is located, and the period of the reference signal with PDCCH QCL-TYPEA or QCL-TYPEC is 20 milliseconds, 40 milliseconds or 80 milliseconds.

Optionally, the reference signal with PDCCH QCL-TYPEA or QCL-TYPEC is SSB or CSI-RS.

The embodiment of the present invention also provides another method for estimating timing offset based on PDCCH in an NR system, the method includes: receiving frequency domain data of a PDCCH demodulation reference signal, wherein the PDCCH demodulation reference signal is configured as a wideband demodulation reference signal; Perform correlation calculation between the received frequency domain data and the UE local PDCCH demodulation reference signal sequence corresponding to the PDCCH demodulation reference signal to obtain a frequency domain channel estimation value sequence; transform the frequency domain channel estimation value sequence into a time domain channel estimation value sequence; in the time domain channel estimation value sequence, select the main path with the maximum received power of each receiving antenna at the UE, and determine the position with the most occurrences in the main path as the final main path position; save the final main path position with the UE The difference obtained by comparing the target timing of the PDCCH is determined as the first timing deviation of the PDCCH; receiving the reference signal with PDCCH QCL-TYPEA or QCL-TYPEC; based on the reference signal with PDCCH QCL-TYPEA or QCL-TYPEC, obtain the PDCCH The second timing offset; the timing offset of the PDCCH is set according to one of the following two: if the acquisition time of the first timing offset is not later than the acquisition time of the second timing offset, then the first timing offset Set as the timing offset of PDCCH, otherwise set the second timing offset as the timing offset of PDCCH; the other of the two is: according to the sampling frequency of the PDCCH demodulation reference signal and the reference with PDCCH QCL-TYPEA or QCL-TYPEC The ratio of the sampling frequencies of the signals sets the weight of the first timing offset and the weight of the second timing offset, and the first timing offset and the second timing offset are weighted and summed to obtain the timing offset of the PDCCH.

Optionally, the timing of the UE is adjusted based on the timing offset of the PDCCH.

Optionally, in the time-domain channel estimation value sequence, selecting the main path with the maximum received power of each receiving antenna at the UE includes:

The main path with the maximum received power of each receiving antenna is selected through the respective multipath window of each receiving antenna, and the multipath window is a numerical range related to the number of IFFT points.

Optionally, the number of IFFT points is 256, the length of the multipath window is set to 64 points, and the numerical range is between 1 and 32 and between 225 and 256.

Optionally, the PDCCH demodulation reference signal is configured as a wideband demodulation reference signal by setting the CORESET parameter precoderGranularity of the PDCCH to allContiguousRBs.

Optionally, the received frequency domain data and the UE local PDCCH demodulation reference signal sequence corresponding to the PDCCH demodulation reference signal are correlated and calculated to obtain the frequency domain channel estimation value sequence: The data and the UE local PDCCH demodulation reference signal sequence corresponding to the PDCCH demodulation reference signal are conjugated multiplied to obtain the frequency domain channel estimation value sequence. The correlation formula is:

H_cch_dmrs(l,rx,m)=R_cch_dmrs(l,rx,m)*conj(local(l,m)),

Among them, H_cch_dmrs(l,rx,m) is the frequency domain channel estimation value sequence, R_cch_dmrs(l,rx,m) is the received frequency domain data, local(l,m) is the UE local PDCCH demodulation reference signal sequence, l is a symbol, rx is a receiving antenna parameter, and m is a physical resource block parameter.

Optionally, the period of the reference signal with PDCCH QCL-TYPEA or QCL-TYPEC is 10, 20, 40 or 80 milliseconds.

Optionally, the reference signal with PDCCH QCL-TYPEA or QCL-TYPEC is SSB or CSI-RS.

An embodiment of the present invention further provides an apparatus for estimating timing offset based on PDCCH in an NR system, the apparatus includes: a receiving module adapted to receive frequency domain data of a PDCCH demodulation reference signal, wherein the PDCCH demodulation reference signal is configured as a wideband demodulation signal A modulation reference signal; a calculation module, adapted to perform correlation calculation between the received frequency domain data and the UE local PDCCH demodulation reference signal sequence corresponding to the PDCCH demodulation reference signal to obtain a frequency domain channel estimation value sequence; a transformation module, suitable for Transform the frequency domain channel estimation value sequence into the time domain channel estimation value sequence; the selection module is suitable for selecting the main path with the maximum received power of each receiving antenna at the UE in the time domain channel estimation value sequence, and the number of occurrences in the main path is calculated. The most position is determined as the final main path position; the determining module is adapted to determine the difference obtained by comparing the final main path position with the target timing saved at the UE as the timing deviation of the PDCCH.

Optionally, the apparatus includes an adjustment module adapted to adjust the timing of the UE based on the timing offset of the PDCCH.

An embodiment of the present invention further provides another apparatus for estimating timing offset based on PDCCH in an NR system, the other apparatus includes: a first module, where the first module includes a first receiving sub-module, a calculating sub-module, a transforming sub-module, a selection sub-module, a Submodule and determination submodule, the first receiving submodule is adapted to receive frequency domain data of the PDCCH demodulation reference signal, wherein the PDCCH demodulation reference signal is configured as a wideband demodulation reference signal, and the calculation submodule is adapted to receive the received frequency domain data. The domain data and the UE local PDCCH demodulation reference signal sequence corresponding to the PDCCH demodulation reference signal are correlated to obtain the frequency domain channel estimation value sequence, and the transform sub-module is suitable for transforming the frequency domain channel estimation value sequence into the time domain channel estimation value. Sequence, the selection sub-module is suitable for selecting the main path with the maximum received power of each receiving antenna at the UE in the time-domain channel estimation value sequence, and determining the position with the most occurrences in the main path as the final main path position, and determining the sub-module suitable for the main path. The difference obtained by comparing the final primary path position with the target timing saved at the UE is determined as the first timing deviation of the PDCCH; the second module, the second module includes a second receiving submodule and an obtaining submodule, the second receiving The sub-module is adapted to receive a reference signal with PDCCH QCL-TYPEA or QCL-TYPEC, and the obtaining sub-module is adapted to obtain the second timing offset of the PDCCH based on the reference signal with PDCCH QCL-TYPEA or QCL-TYPEC; the third module, adapted to The timing offset of the PDCCH is set according to one of the following two: if the acquisition moment of the first timing offset is not later than the acquisition moment of the second timing offset, then the first timing offset is set as the PDCCH timing offset. Timing deviation, otherwise the second timing deviation is set as the timing deviation of PDCCH; the other of the two is: according to the sampling frequency of the PDCCH demodulation reference signal and the sampling frequency of the reference signal of PDCCH QCL-TYPEA or QCL-TYPEC The ratio of , sets the weight of the first timing offset and the weight of the second timing offset, and performs weighted summation on the first timing offset and the second timing offset to obtain the timing offset of the PDCCH.

Optionally, the another apparatus includes a fourth module, and the fourth module is adapted to adjust the timing of the UE based on the timing offset of the PDCCH.

The embodiment of the present invention also discloses a storage medium, on which computer instructions are stored, the computer instructions execute the steps of the method for estimating timing offset based on PDCCH in an NR system when the computer instructions are running.

The embodiment of the present invention also discloses another storage medium on which computer instructions are stored, and when the computer instructions run, the steps of the method for estimating timing offset based on PDCCH in the another NR system are executed.

An embodiment of the present invention also discloses a user equipment, including a memory and a processor, the memory stores computer instructions that can be run on the processor, and when the processor runs the computer instructions, the processor executes the PDCCH-based estimation timing in the NR system The steps of the bias method.

The embodiment of the present invention also discloses another user equipment, including a memory and a processor, the memory stores computer instructions that can be run on the processor, and when the processor runs the computer instructions, the processor executes the PDCCH-based PDCCH in the other NR system. Steps of the estimation timing offset method.

Compared with the prior art, the technical solutions of the embodiments of the present invention have the following beneficial effects:

Compared with the possibly longer period of the reference signal of PDCCH QCL-typeA or QCL-typeC, when the PDCCH demodulation reference signal (De-Modulate Reference Signal, referred to as DM-RS) is configured as a wideband demodulation reference signal (wideband DM -RS), since the period of the reference signal is short, it can effectively adapt to the channel that changes rapidly.

Moreover, compared with the possibly smaller number of RSs configured with the reference signal of PDCCH QCL-typeA or QCL-typeC (there are fewer samples, thus affecting the accuracy of the timing estimation result), when the PDCCH DM-RS is configured When it is a wideband DM-RS, the number of RSs in the PDCCH DM-RS will be greater than the number of RSs configured in the reference signal, so that the timing offset can be estimated more accurately.

Description of drawings

1 is a flowchart of a method for estimating timing offset based on PDCCH in an NR system according to an embodiment of the present invention;

2 is a flowchart of a method for estimating timing offset based on PDCCH in another NR system according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an apparatus for estimating timing offset based on PDCCH in an NR system according to an embodiment of the present invention.

FIG. 4 is a schematic structural diagram of an apparatus for estimating timing offset based on PDCCH in another NR system according to an embodiment of the present invention.

Detailed ways

The prior art utilizes the reference signal of PDCCH QCL-typeA or QCL-typeC to adjust the timing of the PDCCH, such as a channel state information reference signal (Channel State Information Reference Signal, referred to as CSI-RS) (which is configured with trs). -Info or not configured with trs-Info), synchronization signal block (Synchronization signal block, SSB for short). However, on the one hand, if the period of these reference signals is long, when there are fast-changing channels, the timing of the reference signals cannot keep up with the changes of these fast-changing channels in time; on the other hand, these reference signals are in the frequency domain. When the number of RSs occupied on the network is small, the accuracy of timing estimation is also poor.

For example, the period of CSI-RS for tracking can be configured as 10, 20, 40, 80 milliseconds (please refer to Section 5.1.6.1.1 of 3GPP protocol TS 38.214), when the period is configured When it is a large period (such as 40 or 80 milliseconds), in the case where the channel changes rapidly (for example, the period of change is less than 40 or 80 milliseconds), the timing information estimated by using CSI-RS will be untimely; and, if If the CSI-RS used for tracking is configured with a smaller number of RSs, the samples will be sampled less, which will affect the accuracy of timing offset estimation.

In contrast, in the technical solution of the present invention, when the PDCCH DM-RS is configured as a wideband DM-RS (that is, the parameter precoderGranularity of the Control Resource Set (CORESET) of the PDCCH is set to allContiguousRBs), a On the one hand, the signal period is short, and even every downlink time slot is issued, so that more dense PDCCH DM-RS can be scheduled to estimate timing information, so that the timing deviation can be estimated in a more timely manner. The number of RSs is greater than the number of RSs of the above-mentioned reference signal (eg, CSI-RS), and the samples sampled are also higher, thereby improving the accuracy of timing offset estimation. The technical solution of the present invention can estimate the timing deviation in a more timely and accurate manner, so that the timing deviation can be corrected more quickly and accurately, thereby effectively improving the reception performance of various subsequent downlink channels, such as physical downlink channels. Shared Channel (PhysicalDownlink Shared Channel, PDSCH for short), PDCCH, etc.

The technical solution of the present invention is implemented at the UE, and the PDCCH DM-RS configuration information received by the UE is set using high-layer signaling (eg, Radio Resource Control (RRC) signaling).

In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

1 is a flowchart of a method 100 for estimating timing offset based on PDCCH in an NR system according to an embodiment of the present invention, including the following steps:

Step S110: Receive frequency domain data of a PDCCH demodulation reference signal, wherein the PDCCH demodulation reference signal is configured as a wideband demodulation reference signal;

Step S120: Perform correlation calculation between the received frequency domain data and the UE local PDCCH demodulation reference signal sequence corresponding to the PDCCH demodulation reference signal to obtain a frequency domain channel estimation value sequence;

Step S130: Transform the frequency-domain channel estimation value sequence into a time-domain channel estimation value sequence;

Step S140: Select the main path with the maximum received power of each receiving antenna at the UE in the time-domain channel estimation value sequence, and determine the position with the most occurrences in the main path as the final main path position;

Step S150: Determine the difference obtained by comparing the final primary path position with the target timing saved at the UE as the timing offset of the PDCCH.

In the implementation of step S110, the UE receives a PDCCH DM-RS, and the PDCCH DM-RS is configured as a wideband DM-RS.

Specifically, CORESET indicates the number of resource blocks (Resource Blocks, referred to as RBs) occupied by the PDCCH in the frequency domain and the number of symbols (Symbols) occupied in the time domain, where the number of occupied RBs is determined by ControlResourceSetInformation Element (also called It is set for the parameter frequencyDomainResources in ControlResourceSet IE). The number of occupied symbols is set by the parameter duration in ControlResourceSet IE. The precoding property is set by the parameter precoderGranularity in ControlResourceSet IE. The precoderGranularity can be set to allContiguousRBs or sameAsREG-bundle. When the precoderGranularity is set to allContiguousRBs, the PDCCH DM-RS is characterized as a wideband DM-RS. The ControlResourceSet IE is sent by the base station to the UE via the downlink at the RRC layer (see section 7.3.2.2 of 3GPP protocol TS38.211 and section 6.3.2 of TS 38.331).

The CORESET concept is introduced in the NR system, but not in the LTE system. In NR systems, the parameter precoderGranularity is used to configure precoding. However, the prior art does not consider that the parameter precoderGranularity is used to configure other applications than precoding. Specifically, the prior art does not take into account that when the parameter precoderGranularity is set to allContiguousRBs, the PDCCH DM-RS has a short period and can estimate timing information in time, nor does it take into account that when the parameter precoderGranularity is set to allContiguousRBs, the number of RSs in the PDCCH DM-RS is greater than The number of RSs for reference signals (eg, CSI-RS) can improve the accuracy of timing offset estimation.

In the implementation of step S120, correlation calculation is performed between the frequency domain data of the PDCCH DM-RS received by the UE and the PDCCH DM-RS sequence corresponding to the PDCCH DM-RS and stored locally in the UE to obtain a frequency domain channel estimate sequence of values.

In one embodiment, the received PDCCH DM-RS frequency domain data and the UE local PDCCH DM-RS sequence corresponding to the PDCCH DM-RS are conjugated multiplied by a correlation formula to obtain a frequency domain channel estimation value sequence, the The relevant formula is the following formula (1):

H_cch_dmrs(l,rx,m)=R_cch_dmrs(l,rx,m)*conj(local(l,m)) (1)

Among them, H_cch_dmrs(l,rx,m) is the frequency domain channel estimation value sequence, R_cch_dmrs(l,rx,m) is the received PDCCH DM-RS frequency domain data, local(l,m) is the UE local PDCCH DM- RS sequence, conj() is the conjugate function, l is the symbol (according to the actual configuration, l=l_start, or l=l_start, l_start+1, or l=l_start, l_start+1, l_start+2, l_start is PDCCH associated The start symbol of CORESET), rx is the receiving antenna parameter (rx is 0, 1, ..., Rx_ant-1) (Rx_ant is the number of receiving antennas), m is the physical resource block parameter (m is 0, 1, 2, ... ..., Nprb*3-1, where Nprb is the number of physical resource blocks (Physical resource blocks, PRBs for short) occupied by the CORESET associated with the PDCCH.

Through the correlation formula, L_symb*Rx_ant frequency-domain channel estimation values can be obtained, where L_symb is the number of symbols of the wideband DM-RS in the PDCCH.

In the implementation of step S130, the frequency-domain channel estimation value sequence is transformed into a time-domain channel estimation value sequence.

In one embodiment, the frequency-domain channel estimation value sequence is transformed into a time-domain channel estimation value sequence through an inverse fast Fourier transform (Inverse Fast Fourier Transform, IFFT for short), please refer to the following formula (2):

h_cch_dmrs(l,rx,n)=ifft(H_cch_dmrs,Nfft) (2)

Among them, h_cch_dmrs(l,rx,n) is the time domain channel estimation value sequence, H_cch_dmrs(l,rx,m) is the frequency domain channel estimation value sequence, ifft() is the IFFT function, l is the symbol (according to the actual configuration, l =l_start, or l=l_start, l_start+1, or l=l_start, l_start+1, l_start+2, l_start is the start symbol of the CORESET associated with the PDCCH), rx is the receiving antenna parameter (rx is 0, 1, ... ..., Rx_ant-1), n is the number of resource elements (Resource Element, RE for short) occupied by the PDCCH DM-RS, the specific number depends on the configuration of the base station, Nfft is the value of log2(3*Nprb) rounded up.

In the implementation of step S140, the final dominant path position is determined based on the time-domain channel estimation value sequence calculated by formula (2).

Specifically, the time-domain channel estimation value sequence calculated by formula (2) involves Rx_ant receiving antennas at the UE, each receiving antenna receives multipath signals respectively, and each receiving antenna is determined by setting its own multipath window. The respective effective multipath signals of each receiving antenna, and the position of the maximum power received by each receiving antenna in its corresponding multipath window is determined as the main path of the receiving antenna. Compare the main diameters of all receiving antennas, and determine the position with the most occurrences among these main diameters as the final main diameter position.

More specifically, the time-domain channel estimation value sequence calculated by formula (2) has noise and needs to be de-noised. The multipath window takes the signal outside the window as a noise path and sets it to zero, and takes the signal inside the window as an effective signal; the multipath window is a numerical range related to the number of IFFT points, where the value i represents the first channel estimation value sequence in the time domain. i values. How many samples of the time-domain channel estimate are needed to cover the delay spread can be determined from the multipath delay spread, ie, the multipath window can be dynamically adjusted to cover the multipath delay spread.

For example, the subcarrier spacing is 30Khz, the sampling frequency is 122.88Mhz, the number of IFFT points is 256, and the time resolution of the time-domain channel estimation value sequence after IFFT processing is 4/122.88μs. If it is desired to adjust the main path to the position of 1, when the received timing signal has no deviation, the main path will fall at the position where the number of IFFT points is 1. If the timing signal is received i samples ahead (indicating that the timing is shifted forward by i* 4/122.88μs), the main diameter will fall at the position of i+1, if the timing signal is received with a lag of i samples (indicating that the timing is shifted backward by i*4/122.88μs), the main diameter will fall at 257- The position of i (IFFT has a cyclic shift feature); the calculation to adjust the major diameter to other desired positions is similar to the calculation described above for the position where the major diameter is expected to be adjusted to 1. In one embodiment, the number of IFFT points is 256, the length of the multipath window is set to 64 points, and the numerical range of the multipath window can be set between 1 and 32 and between 225 and 256.

For determining the final major diameter position, please refer to the following formula (3):

Pos=PathSelect(Pos_h_pss) (3)

Among them, Pos is the final main path position, Pos_h_pss is the main path of each receiving antenna, and PathSelect is the final main path position selection function.

The technical solution of the present invention is not applicable to the situation where the parameter precoderGranularity in the ControlResourceSet IE is set to the sameAsREG-bundle. Specifically, in this case, since the precoding is based on REG-bundles, different REG-bundles may have different phase differences, which will lead to the maximum power received by each receiving antenna after transformation to the time domain (also referred to as The main diameter power of the receiving antenna is not obvious, so the main diameter of the receiving antenna cannot be distinguished, and the final main diameter position cannot be calculated. Therefore, setting the parameter precoderGranularity in ControlResourceSet IE to sameAsREG-bundle cannot be used to calculate timing offset.

In the implementation of step S150, the difference obtained by comparing the final primary path position calculated by the formula (3) with the target timing saved at the UE is determined as the timing deviation of the PDCCH, please refer to the following formula (4):

△t=Pos–Pos_target (4)

Among them, Δt is the timing deviation, Pos is the final main diameter position, and Pos_target is the target timing.

In a specific embodiment, the timing of the UE is adjusted based on the determined timing offset. As a result, the timing deviation can be corrected more quickly and accurately at the UE, thereby effectively improving the reception performance of various subsequent downlink channels.

In some technical solutions of the present invention for determining the timing offset based on the wideband DM-RS in the PDCCH, there is no reference signal with the PDCCH QCL-TYPEA or QCL-TYPEC in the time slot where the PDCCH is located. This can be achieved by judging preconditions before implementing these technical solutions. The precondition judgments include judging whether it is the time slot where the PDCCH is located and judging whether there is a reference signal with the PDCCH QCL-TYPEA or QCL-TYPEC (the The reference signal is, for example, SSB or CSI-RS). The timing offset is determined by combining the precondition judgment. On the one hand, in the case where the reference signal with PDCCH QCL-TYPEA or QCL-TYPEC cannot be used to estimate the timing offset, the present invention can be based on the wideband DM-RS in the PDCCH. On the other hand, when the reference signal with PDCCH QCL-TYPEA or QCL-TYPEC is used to estimate the timing offset, the technical solution of using PDCCH-based wideband DM-RS can be avoided, thereby simplifying the estimation Design and implementation of timing offset schemes.

In other technical solutions of the present invention for determining the timing offset based on the wideband DM-RS in the PDCCH, the time slot where the PDCCH is located may have reference signals with the PDCCH QCL-TYPEA or QCL-TYPEC, but the period of these reference signals is relatively long (In a specific scenario, the longer period is, for example, 20 milliseconds, 40 milliseconds or 80 milliseconds). This can be achieved by judging the preconditions before implementing these technical solutions. The precondition judgments include judging whether it is the time slot where the PDCCH is located and judging whether there is a long period that is related to the PDCCH QCL-TYPEA or QCL-TYPEC. the reference signal (for example, the reference signal is SSB or CSI-RS). In the case where the timing offset can be estimated by using the reference signal with a longer period of the PDCCH QCL-TYPEA or QCL-TYPEC, considering that the reference signal with a longer period may not be able to estimate the fast change in a specific scenario in time The timing offset of the channel (such as PDCCH), and the wideband DM-RS in the PDCCH is actively selected to estimate the timing offset more timely.

2 is a flowchart of a method 200 for estimating timing offset based on PDCCH in another NR system according to an embodiment of the present invention, including the following steps:

Step S210: Receive frequency domain data of the PDCCH demodulation reference signal, wherein the PDCCH demodulation reference signal is configured as a wideband demodulation reference signal;

Step S220: Perform correlation calculation between the received frequency domain data and the UE local PDCCH demodulation reference signal sequence corresponding to the PDCCH demodulation reference signal to obtain a frequency domain channel estimation value sequence;

Step S230: Transform the frequency-domain channel estimation value sequence into a time-domain channel estimation value sequence;

Step S240: Select the main path with the maximum received power of each receiving antenna at the UE in the time-domain channel estimation value sequence, and determine the position with the most occurrences in the main path as the final main path position;

Step S250: The difference obtained by comparing the final primary path position with the target timing saved at the UE is determined as the first timing offset of the PDCCH;

Step S260: Receive a reference signal with PDCCH QCL-TYPEA or QCL-TYPEC;

Step S270: Obtain the second timing offset of the PDCCH based on the reference signal of the PDCCH QCL-TYPEA or QCL-TYPEC;

Step S280: Obtain the timing offset of the PDCCH according to one of the following two: if the acquisition moment of the first timing offset is not later than the acquisition moment of the second timing offset, set the first timing offset to The timing deviation of the PDCCH, otherwise the second timing deviation is set as the timing deviation of the PDCCH; the other of the two is: according to the sampling frequency of the PDCCH demodulation reference signal and the reference signal of the PDCCH QCL-TYPEA or QCL-TYPEC. The ratio of the sampling frequency sets the weight of the first timing offset and the weight of the second timing offset, and the first timing offset and the second timing offset are weighted and summed to obtain the timing offset of the PDCCH. The above steps include a first obtaining step (including steps S210, S220, S230, S240 and S250) of obtaining a first timing offset and a second obtaining step (S260 and S270) of obtaining a second timing offset, wherein the first obtaining step may be It is performed before, after or simultaneously with the second obtaining step.

For more contents of steps S210 , S220 , S230 , S240 and S250 , please refer to the above descriptions of steps S110 , S120 , S130 , S140 and S150 , respectively.

In the implementation of step S260, the UE receives a reference signal with PDCCH QCL-TYPEA or QCL-TYPEC.

Specifically, the UE receives downlink control information (Downlink Control Information, referred to as DCI for short) through the downlink, and the DCI includes QCL indication information, the QCL indication information indicates the large-scale attributes (such as timing offset) of the signal received by one antenna port. ) are the same in whole or in part as the signals received from other antenna ports. Among them, QCL-TypeA and QCL-TypeC contain timing information.

In the implementation of step S270, the UE obtains the second timing offset of the PDCCH based on the reference signal of the PDCCH QCL-TYPEA or QCL-TYPEC.

Specifically, when the PDCCH and a certain reference signal (such as CSI-RS, SSB, etc., as described above) are configured as QCL-TypeA or QCL-TypeC, the timing offset estimated by the reference signal is used. Also applies to PDCCH.

In the implementation of step S280, one of two ways may be adopted to obtain the timing offset of the PDCCH.

One way is: if the acquisition time of the first timing offset is not later than the acquisition time of the second timing offset, set the first timing offset as the timing offset of the PDCCH; otherwise, set the second timing offset as the timing offset of the PDCCH. In particular, some aspects of the present invention take into account that the reception performance of the downlink channel can be severely affected when the timing offset cannot be obtained in time. In combination with this method, the corresponding technical solution provided by the present invention simultaneously adopts two timing offset estimation methods (that is, estimating the PDCCH timing offset based on the wideband DM-RS in the PDCCH and estimating the PDCCH timing offset based on the PDCCH QCL-TYPEA or QCL-TYPEC). On the other hand, the timing deviation obtained at the previous time in these two estimation methods is set as the timing deviation of the PDCCH, so that the obtained timing deviation is more timely, thus effectively guaranteeing the subsequent downlink channel. reception performance.

Another way is to set the weight of the first timing offset and the weight of the second timing offset according to the ratio of the sampling frequency of the PDCCH demodulation reference signal and the sampling frequency of the PDCCH QCL-TYPEA or QCL-TYPEC reference signal. The timing offset of the PDCCH is obtained by performing weighted summation of the certain timing offset and the second timing offset. Specifically, compare the sampling frequency of the PDCCH demodulation reference signal with the sampling frequency of the PDCCH QCL-TYPEA or QCL-TYPEC reference signal to obtain the ratio (for example, if the ratio is 1:3, then the ratio can be The weight of the first timing offset is set to 1/4, and the weight of the second timing offset is set to 3/4), and then the first timing offset and the second timing offset are multiplied by their respective weights and then summed (that is, the weighted summation ) to calculate the timing offset of the PDCCH. In combination with this method, the corresponding technical solution provided by the present invention simultaneously adopts two timing offset estimation methods (that is, estimating the PDCCH timing offset based on the wideband DM-RS in the PDCCH and estimating the PDCCH timing offset based on the PDCCH QCL-TYPEA or QCL-TYPEC). On the other hand, the first timing offset and the second timing offset estimated by these two estimation methods are weighted and summed to obtain the timing offset of the PDCCH, so that the obtained timing offset is more accurate , thereby effectively guaranteeing the reception performance of the subsequent downlink channel.

FIG. 3 is a schematic structural diagram of an apparatus 300 for estimating timing offset based on PDCCH in an NR system according to an embodiment of the present invention.

The apparatus 300 includes a receiving module 310 , a calculating module 320 , a transforming module 330 , a selecting module 340 and a determining module 350 .

Specifically, the receiving module 310 is adapted to receive frequency domain data of the PDCCH demodulation reference signal, wherein the PDCCH demodulation reference signal is configured as a wideband demodulation reference signal; the calculation module 320 is adapted to combine the received frequency domain data with the PDCCH The UE local PDCCH demodulation reference signal sequence corresponding to the demodulation reference signal performs correlation calculation to obtain a frequency domain channel estimation value sequence; the transform module 330 is adapted to transform the frequency domain channel estimation value sequence into a time domain channel estimation value sequence; selection module 340 , which is suitable for selecting the main path with the maximum received power of each receiving antenna at the UE in the time-domain channel estimation value sequence, and determining the position with the most occurrences in the main path as the final main path position; the determining module 350 is suitable for determining the final main path position. The difference obtained by comparing the position of the primary path with the target timing stored at the UE is determined as the timing offset of the PDCCH.

In a specific embodiment, the apparatus 300 includes an adjustment module adapted to adjust the timing of the UE based on the timing offset of the PDCCH.

For more details on the working principle and working mode of the apparatus 300 for estimating timing offset based on PDCCH in an NR system, reference may be made to the above-mentioned description of the method 100 for estimating timing offset based on PDCCH in an NR system, which will not be repeated here.

FIG. 4 is a schematic structural diagram of an apparatus 400 for estimating timing offset based on PDCCH in another NR system according to an embodiment of the present invention.

The other apparatus includes a first module 410 , a second module 420 and a third module 430 .

Specifically, the first module 410 includes a first receiving sub-module 411, a computing sub-module 412, a transforming sub-module 413, a selection sub-module 414 and a determining sub-module 415, and the first receiving sub-module 411 is adapted to receive the PDCCH demodulation reference signal The frequency domain data of , wherein the PDCCH demodulation reference signal is configured as a wideband demodulation reference signal; the calculation sub-module 412 is adapted to combine the received frequency domain data and the UE local PDCCH demodulation reference signal sequence corresponding to the PDCCH demodulation reference signal Perform correlation calculation to obtain a sequence of channel estimation values in the frequency domain; the transform submodule 413 is adapted to transform the sequence of channel estimation values in the frequency domain into a sequence of channel estimation values in the time domain; the selection submodule 414 is adapted to select UEs in the sequence of channel estimation values in the time domain The main path with the maximum received power of each receiving antenna at the location, and the position with the most occurrences in the main path is determined as the final main path position; the determination sub-module 415 is adapted to compare the final main path position with the target timing saved at the UE to determine The obtained difference is determined as the first timing offset of the PDCCH. The second module 420 includes a second receiving sub-module 421 and an obtaining sub-module 422. The second receiving sub-module 421 is adapted to receive a reference signal with PDCCH QCL-TYPEA or QCL-TYPEC; the obtaining sub-module 422 is adapted to Or the second timing offset of the PDCCH is obtained from the reference signal of QCL-TYPEC. The third module 430 is adapted to set the timing offset of the PDCCH according to one of the following two: if the acquisition moment of the first timing offset is not later than the acquisition moment of the second timing offset, then the first timing offset The deviation is set to the timing deviation of the PDCCH, otherwise the second timing deviation is set to the timing deviation of the PDCCH; the other of the two is: according to the sampling frequency of the PDCCH demodulation reference signal and the PDCCH QCL-TYPEA or QCL-TYPEC The ratio of the sampling frequency of the reference signal sets the weight of the first timing offset and the weight of the second timing offset, and the first timing offset and the second timing offset are weighted and summed to obtain the timing offset of the PDCCH.

In a specific embodiment, the further apparatus 400 includes a fourth module adapted to adjust the timing of the UE based on the timing offset of the PDCCH.

For more details on the working principle and working mode of the apparatus 400 for estimating timing offset based on PDCCH in another NR system, you can refer to the above related description about the method 200 for estimating timing offset based on PDCCH in another NR system, and details are not repeated here. .

The embodiment of the present invention discloses a storage medium on which computer instructions are stored, and when the computer instructions run, the steps of the above-mentioned method 100 for estimating timing offset based on PDCCH in an NR system are performed.

The embodiment of the present invention discloses another storage medium on which computer instructions are stored, and when the computer instructions run, the steps of the above-mentioned method 200 for estimating timing offset based on PDCCH in another NR system are executed.

The storage medium includes a read-only memory (Read-Only Memory, ROM for short), a random access memory (Random Access Memory, RAM for short), a magnetic disk or an optical disk, and the like. The storage medium also includes a non-volatile memory (Non-volatile) or a non-transitory (Non-transitory) memory and the like.

An embodiment of the present invention discloses a user equipment. The user equipment includes a memory and a processor. The memory stores computer instructions that can be run on the processor. When the processor runs the computer instructions, the processor executes the PDCCH-based timing estimation in the above-mentioned NR system. Steps of Deviation Method 100 .

The embodiment of the present invention discloses another user equipment. The user equipment includes a memory and a processor. The memory stores computer instructions that can be run on the processor. When the processor runs the computer instructions, it executes the PDCCH-based PDCCH in the above-mentioned other NR system. The steps of estimating timing offset method 200 .

The user equipment is a terminal applied in the NR system, and the terminal includes mobile terminal equipment such as a mobile phone.

Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be based on the scope defined by the claims.

Claims (25)

1. A method for estimating a timing offset based on a PDCCH in an NR system, the method comprising:

receiving frequency domain data of a PDCCH demodulation reference signal, wherein the PDCCH demodulation reference signal is configured as a broadband demodulation reference signal;

performing correlation calculation on the received frequency domain data and a UE local PDCCH demodulation reference signal sequence corresponding to the PDCCH demodulation reference signal to obtain a frequency domain channel estimation value sequence;

transforming the frequency domain channel estimation value sequence into a time domain channel estimation value sequence;

selecting a main path with the maximum receiving power of each receiving antenna at the UE in the time domain channel estimation value sequence, and determining the position with the maximum occurrence frequency in the main path as the final main path position;

and determining a difference value obtained by comparing the final main path position with a target timing saved at the UE as a timing deviation of the PDCCH.

2. The method of claim 1, wherein timing of the UE is adjusted based on a timing offset of the PDCCH.

3. The method of claim 1, wherein the selecting the main path with the maximum received power for each receiving antenna at the UE in the time domain channel estimation value sequence comprises:

and selecting a main path with maximum receiving power of each receiving antenna through a multipath window of each receiving antenna, wherein the multipath window is a numerical range related to the number of IFFT points.

4. The method according to claim 3, wherein the number of IFFT points is 256, the length of the multipath window is set to 64 points, and the value range is between 1 and 32 and between 225 and 256.

5. The method of claim 1, wherein the PDCCH demodulation reference signal is configured as the wideband demodulation reference signal by setting a CORESET parameter precoding granularity of the PDCCH to alloContiguousSRBs.

6. The method of claim 1, wherein the correlating the received frequency domain data with a UE local PDCCH demodulation reference signal sequence corresponding to the PDCCH demodulation reference signal to obtain a frequency domain channel estimation value sequence is:

and performing conjugate multiplication on the received frequency domain data and a UE local PDCCH demodulation reference signal sequence corresponding to the PDCCH demodulation reference signal through a correlation formula to obtain a frequency domain channel estimation value sequence, wherein the correlation formula is as follows:

H_cch_dmrs(l,rx,m)＝R_cch_dmrs(l,rx,m)*conj(local(l,m))，

wherein, H _ cch _ dmrs (l, rx, m) is the frequency domain channel estimation value sequence, R _ cch _ dmrs (l, rx, m) is the received frequency domain data, local (l, m) is the UE local PDCCH demodulation reference signal sequence, l is a symbol, rx is a receiving antenna parameter, and m is a physical resource block parameter.

7. The method of claim 1, wherein the PDCCH does not have a reference signal QCL-TYPEA or QCL-TYPEC from the PDCCH in a time slot in which the PDCCH is located.

8. The method of claim 1, wherein the PDCCH is in a time slot in which a reference signal corresponding to the PDCCH QCL-TYPEA or QCL-TYPEC is present, and wherein the reference signal corresponding to the PDCCH QCL-TYPEA or QCL-TYPEC has a period of 20 ms, 40 ms, or 80 ms.

9. The method of claim 7 or 8, wherein the reference signal to the PDCCH QCL-TYPEA or QCL-TYPEC is SSB or CSI-RS.

10. A method for estimating a timing offset based on a PDCCH in an NR system, the method comprising:

receiving frequency domain data of a PDCCH demodulation reference signal, wherein the PDCCH demodulation reference signal is configured as a broadband demodulation reference signal;

performing correlation calculation on the received frequency domain data and a UE local PDCCH demodulation reference signal sequence corresponding to the PDCCH demodulation reference signal to obtain a frequency domain channel estimation value sequence;

transforming the frequency domain channel estimation value sequence into a time domain channel estimation value sequence;

selecting a main path with the maximum receiving power of each receiving antenna at the UE in the time domain channel estimation value sequence, and determining the position with the maximum occurrence frequency in the main path as the final main path position;

determining a difference value obtained by comparing the final main path position with a target timing saved at the UE as a first timing deviation of the PDCCH;

receiving a reference signal with the PDCCH QCL-TYPEA or QCL-TYPEC;

obtaining a second timing offset for the PDCCH based on a reference signal to the PDCCH QCL-TYPEA or QCL-TYPEC;

obtaining a timing offset of the PDCCH according to one of: setting the first timing offset as the timing offset of the PDCCH if the obtaining time of the first timing offset is not later than the obtaining time of the second timing offset, otherwise setting the second timing offset as the timing offset of the PDCCH, wherein the other one of the two is as follows: and setting the weight of the first timing deviation and the weight of the second timing deviation according to the ratio of the sampling frequency of the PDCCH demodulation reference signal to the sampling frequency of the reference signal of the PDCCH QCL-TYPEA or QCL-TYPEC, and carrying out weighted summation on the first timing deviation and the second timing deviation to obtain the timing deviation of the PDCCH.

11. The method of claim 10, wherein timing of the UE is adjusted based on a timing offset of the PDCCH.

12. The method of claim 10, wherein the selecting the main path with the maximum received power for each receiving antenna at the UE in the time domain channel estimation value sequence comprises:

and selecting a main path with maximum receiving power of each receiving antenna through a multipath window of each receiving antenna, wherein the multipath window is a numerical range related to the number of IFFT points.

13. The method according to claim 12, wherein the number of IFFT points is 256, the length of the multipath window is set to 64 points, and the value range is between 1 and 32 and between 225 and 256.

14. The method of claim 10, wherein the PDCCH demodulation reference signal is configured as the wideband demodulation reference signal by setting a CORESET parameter precoding granularity of the PDCCH to alloconteguous rbs.

15. The method of claim 10, wherein the correlating the received frequency domain data with a UE local PDCCH demodulation reference signal sequence corresponding to the PDCCH demodulation reference signal to obtain a frequency domain channel estimation value sequence is:

and performing conjugate multiplication on the received frequency domain data and a UE local PDCCH demodulation reference signal sequence corresponding to the PDCCH demodulation reference signal through a correlation formula to obtain a frequency domain channel estimation value sequence, wherein the correlation formula is as follows:

H_cch_dmrs(l,rx,m)＝R_cch_dmrs(l,rx,m)*conj(local(l,m))，

wherein, H _ cch _ dmrs (l, rx, m) is the frequency domain channel estimation value sequence, R _ cch _ dmrs (l, rx, m) is the received frequency domain data, local (l, m) is the UE local PDCCH demodulation reference signal sequence, l is a symbol, rx is a receiving antenna parameter, and m is a physical resource block parameter.

16. The method of claim 10, wherein the reference signal associated with the PDCCH QCL-TYPEA or QCL-TYPEC has a period of 10, 20, 40, or 80 milliseconds.

17. The method of claim 10, wherein the reference signal to the PDCCH QCL-TYPEA or QCL-TYPEC is SSB or CSI-RS.

18. An apparatus for estimating a timing offset based on a PDCCH in an NR system, comprising:

the device comprises a receiving module, a transmitting module and a receiving module, wherein the receiving module is suitable for receiving frequency domain data of a PDCCH demodulation reference signal, and the PDCCH demodulation reference signal is configured to be a broadband demodulation reference signal;

the calculation module is suitable for carrying out correlation calculation on the received frequency domain data and a UE local PDCCH demodulation reference signal sequence corresponding to the PDCCH demodulation reference signal to obtain a frequency domain channel estimation value sequence;

a transformation module adapted to transform the frequency domain channel estimate sequence into a time domain channel estimate sequence;

a selection module, adapted to select a main path with the maximum receiving power of each receiving antenna at the UE in the time domain channel estimation value sequence, and determine a position with the maximum occurrence number in the main path as a final main path position;

a determining module, adapted to determine a difference obtained by comparing the final main path position with a target timing saved at the UE as a timing offset of the PDCCH.

19. The apparatus of claim 18, wherein the apparatus comprises an adjustment module adapted to adjust the timing of the UE based on a timing offset of the PDCCH.

20. An apparatus for estimating a timing offset based on a PDCCH in an NR system, comprising:

a first module, where the first module includes a first receiving submodule adapted to receive frequency-domain data of a PDCCH demodulation reference signal, where the PDCCH demodulation reference signal is configured as a wideband demodulation reference signal, a transforming submodule adapted to transform the frequency-domain channel estimation value sequence into a time-domain channel estimation value sequence, a selecting submodule adapted to select a main path with the maximum receiving power of each receiving antenna at a UE in the time-domain channel estimation value sequence, and determine a position with the maximum occurrence number in the main path as a final main path position, and a determining submodule, where the first receiving submodule is adapted to receive the frequency-domain data of the PDCCH demodulation reference signal, where the calculating submodule is adapted to perform correlation calculation on the received frequency-domain data and a UE local PDCCH demodulation reference signal sequence corresponding to the PDCCH demodulation reference signal to obtain a frequency-domain channel estimation value sequence, the determining submodule is suitable for determining a difference value obtained by comparing the final main path position with a target timing saved at the UE as a first timing deviation of the PDCCH;

a second module comprising a second receiving sub-module adapted to receive a reference signal from the PDCCH QCL-TYPEA or QCL-TYPEC, and an obtaining sub-module adapted to obtain a second timing offset for the PDCCH based on the reference signal from the PDCCH QCL-TYPEA or QCL-TYPEC;

a third module adapted to obtain a timing offset of the PDCCH according to one of: setting the first timing offset as the timing offset of the PDCCH if the obtaining time of the first timing offset is not later than the obtaining time of the second timing offset, otherwise setting the second timing offset as the timing offset of the PDCCH, wherein the other one of the two is as follows: and setting the weight of the first timing deviation and the weight of the second timing deviation according to the ratio of the sampling frequency of the PDCCH demodulation reference signal to the sampling frequency of the reference signal of the PDCCH QCL-TYPEA or QCL-TYPEC, and carrying out weighted summation on the first timing deviation and the second timing deviation to obtain the timing deviation of the PDCCH.

21. The apparatus of claim 20, wherein the apparatus comprises a fourth module adapted to adjust timing of the UE based on a timing offset of the PDCCH.

22. A storage medium having stored thereon computer instructions, wherein the computer instructions are operable to perform the steps of the PDCCH-based timing offset estimation method in an NR system according to any of claims 1 to 9.

23. A storage medium having stored thereon computer instructions, wherein the computer instructions are operable to perform the steps of the PDCCH-based timing offset estimation method in an NR system according to any of claims 10 to 17.

24. A user equipment comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor, when executing the computer instructions, performs the steps of the PDCCH-based timing offset estimation method in the NR system of any one of claims 1 to 9.

25. A user equipment comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor when executing the computer instructions performs the steps of the PDCCH-based timing offset estimation method in the NR system of any one of claims 10 to 17.

Images