CN117676794A - Method, network equipment, device and storage medium for estimating uplink timing advance - Google Patents
Method, network equipment, device and storage medium for estimating uplink timing advance Download PDFInfo
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Abstract
The embodiment of the application provides a method, network equipment, a device and a storage medium for estimating uplink timing advance, wherein the method comprises the following steps: acquiring frequency domain channel estimation on a demodulation reference signal DMRS symbol position of a physical uplink shared channel PUSCH; and carrying out uplink timing advance measurement on the frequency domain channel estimation to obtain the uplink timing advance. According to the method and the device, the frequency domain channel estimation at the DMRS symbol position of the PUSCH is obtained, and the TA is measured according to the frequency domain channel estimation, so that the TA is measured under the conditions that the measured SRS does not reach the activation detection threshold, the SRS period is large, or the SRS scheduling is not performed.
Description
Technical Field
The present disclosure relates to the field of wireless communications technologies, and in particular, to a method, a network device, an apparatus, and a storage medium for estimating an uplink timing advance.
Background
The 5G New air interface (NR) system has become the foundation of the next generation mobile network, and the 5G technology is mainly applied to three scenes of enhancing mobile bandwidth, ultra-high reliability low-delay communication, mass machine communication and the like. In a New air interface (NR) system, an important feature of uplink transmission is that different UEs perform orthogonal multiple access on time-frequency, that is, uplink transmissions from different User Equipments (UEs) in the same cell do not interfere with each other.
To ensure orthogonality of uplink transmissions, avoid intra-cell interference, the network device side (e.g., base station) requires that signals from different UEs of the same subframe but different frequency domain resources arrive at the base station at substantially aligned times. The base station can correctly decode the uplink data only by receiving the uplink data sent by the UE within the cyclic prefix range, so that the uplink synchronization requires that the time when signals from different UEs of the same subframe reach the base station falls within the cyclic prefix range. In order to guarantee time synchronization at the base station side, the NR protocol proposes a mechanism of uplink timing advance (Uplink timing advance, TA).
In the prior art, a base station determines a TA value of each UE based on uplink transmission of a corresponding UE, and most of the base stations use sounding reference signals (Sounding reference signal, SRS) to perform TA measurement, however, how to solve the problem of performing TA measurement when the measured SRS does not reach an activation detection threshold, the SRS period is large, or SRS scheduling is not performed, and the like, and the method for estimating the uplink timing advance is provided, which becomes a technical problem to be solved urgently.
Disclosure of Invention
The application provides a method, network equipment, device and storage medium for estimating uplink timing advance, which are used for solving the defect that in the prior art, under the conditions that a measured SRS does not reach an activation detection threshold, the SRS period is large, or SRS scheduling and the like are not available, TA measurement is difficult to be carried out, and realizing TA measurement based on a demodulation reference signal DMRS of a physical uplink shared channel PUSCH.
In a first aspect, an embodiment of the present application provides a method for estimating an uplink timing advance, including:
acquiring frequency domain channel estimation on a demodulation reference signal DMRS symbol position of a physical uplink shared channel PUSCH;
and carrying out uplink timing advance measurement on the frequency domain channel estimation to obtain the uplink timing advance.
Optionally, according to the method for estimating the uplink timing advance in the embodiment of the present application, the obtaining the frequency domain channel estimation at the symbol position of the demodulation reference signal DMRS of the physical uplink shared channel PUSCH includes:
generating a local reference base sequence according to the related parameters;
extracting a required local reference signal according to the time-frequency domain resource mapping and the pilot frequency pattern;
extracting the pilot symbols from the local reference signal according to the time-frequency domain resource mapping and the pilot pattern and a code division multiplexing Group CDM Group;
and carrying out conjugate complex multiplication on the pilot frequency symbol and the local reference base sequence to obtain the frequency domain channel estimation.
Optionally, according to a method for estimating an uplink timing advance in an embodiment of the present application, the multiplying the pilot symbol by a conjugate complex of a locally known base sequence to obtain the frequency domain channel estimate includes:
Carrying out conjugate complex multiplication on the pilot frequency symbol and the local reference base sequence to obtain a channel frequency domain response after eliminating reference symbol modulation;
and carrying out port separation on the channel frequency domain response to obtain the frequency domain channel estimation at the symbol position of the DMRS.
Optionally, according to a method for estimating an uplink timing advance according to an embodiment of the present application, the performing uplink timing advance measurement on the frequency domain channel estimation to obtain an uplink timing advance includes:
and selecting the frequency domain channel estimation at the first pilot symbol position of the first port of the antenna with the largest signal-to-noise ratio measurement from the pilot symbol positions to perform uplink timing advance measurement.
Optionally, according to a method for estimating an uplink timing advance according to an embodiment of the present application, the performing uplink timing advance measurement on the frequency domain channel estimation to obtain an uplink timing advance includes:
obtaining signal power according to the frequency domain channel estimation;
the signal power is accumulated according to groups to obtain an average value;
according to the average value of the signal power, calculating the angle offset caused by the uplink timing advance;
and converting the angle offset into sampling points to obtain the uplink timing advance.
Optionally, according to a method for estimating an uplink timing advance according to an embodiment of the present application, the calculating an angular offset caused by the uplink timing advance according to the average value of the signal power includes:
calculating the angle deflection caused by the uplink time delay;
and calculating a phase angle corresponding to the uplink timing advance unit.
Optionally, according to a method for estimating an uplink timing advance according to an embodiment of the present application, the converting the angular offset into a sampling point number, to obtain the uplink timing advance includes:
and calculating the uplink timing advance according to the angle deflection and the phase angle corresponding to the uplink timing advance unit.
In a second aspect, embodiments of the present application further provide a network device, including a memory, a transceiver, and a processor;
the memory is used for storing a computer program; the transceiver is used for receiving and transmitting data under the control of the processor; the processor is configured to read the computer program in the memory and perform the following operations:
acquiring frequency domain channel estimation on a demodulation reference signal DMRS symbol position of a physical uplink shared channel PUSCH;
and carrying out uplink timing advance measurement on the frequency domain channel estimation to obtain the uplink timing advance.
Optionally, according to the network device of the embodiment of the present application, the obtaining the frequency domain channel estimation at the symbol position of the demodulation reference signal DMRS of the physical uplink shared channel PUSCH includes:
generating a local reference base sequence according to the related parameters;
extracting a required local reference signal according to the time-frequency domain resource mapping and the pilot frequency pattern;
extracting the pilot symbols from the local reference signal according to the time-frequency domain resource mapping and the pilot pattern and a code division multiplexing Group CDM Group;
and carrying out conjugate complex multiplication on the pilot frequency symbol and the local reference base sequence to obtain the frequency domain channel estimation.
Optionally, according to the network device of the embodiment of the present application, the multiplying the pilot symbol by a conjugate complex of a locally known base sequence to obtain the frequency domain channel estimate includes:
carrying out conjugate complex multiplication on the pilot frequency symbol and the local reference base sequence to obtain a channel frequency domain response after eliminating reference symbol modulation;
and carrying out port separation on the channel frequency domain response to obtain the frequency domain channel estimation at the symbol position of the DMRS.
Optionally, according to the network device of the embodiment of the present application, the performing uplink timing advance measurement on the frequency domain channel estimation to obtain an uplink timing advance includes:
And selecting the frequency domain channel estimation at the first pilot symbol position of the first port of the antenna with the largest signal-to-noise ratio measurement from the pilot symbol positions to perform uplink timing advance measurement.
Optionally, according to the network device of the embodiment of the present application, the performing uplink timing advance measurement on the frequency domain channel estimation to obtain an uplink timing advance includes:
obtaining signal power according to the frequency domain channel estimation;
the signal power is accumulated according to groups to obtain an average value;
according to the average value of the signal power, calculating the angle offset caused by the uplink timing advance;
and converting the angle offset into sampling points to obtain the uplink timing advance.
Optionally, according to the network device of the embodiment of the present application, the calculating an angular offset caused by an uplink timing advance according to the average value of the signal power includes:
calculating the angle deflection caused by the uplink time delay;
and calculating a phase angle corresponding to the uplink timing advance unit.
Optionally, according to the network device of the embodiment of the present application, the converting the angle offset into a sampling point number, to obtain the uplink timing advance includes:
And calculating the uplink timing advance according to the angle deflection and the phase angle corresponding to the uplink timing advance unit.
In a third aspect, an embodiment of the present application further provides an apparatus for estimating an uplink timing advance, including:
the frequency domain channel estimation unit is used for acquiring frequency domain channel estimation at the symbol position of a demodulation reference signal DMRS of a physical uplink shared channel PUSCH;
and the uplink timing advance measuring unit is used for measuring the uplink timing advance of the frequency domain channel estimation to obtain the uplink timing advance.
In a fourth aspect, embodiments of the present application further provide a processor-readable storage medium storing a computer program for causing the processor to perform the method according to the first aspect described above.
According to the method, the network equipment, the device and the storage medium for estimating the uplink timing advance, through obtaining the frequency domain channel estimation on the DMRS symbol position of the PUSCH and measuring the TA according to the frequency domain channel estimation, the TA is measured under the conditions that the measured SRS does not reach the activation detection threshold, the SRS period is large, or the SRS scheduling is not carried out.
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For a clearer description of the present application or of the prior art, the drawings that are used in the description of the embodiments or of the prior art will be briefly described, it being apparent that the drawings in the description below are some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a method for estimating an uplink timing advance according to an embodiment of the present application;
FIG. 2 is a second flow chart of a method for estimating an uplink timing advance according to an embodiment of the present disclosure;
FIG. 3 is a third flow chart of a method for estimating an uplink timing advance according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a network device according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an apparatus for estimating an uplink timing advance according to an embodiment of the present application.
Detailed Description
In the embodiment of the application, the term "and/or" describes the association relationship of the association objects, which means that three relationships may exist, for example, a and/or B may be represented: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.
Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. The term "plurality" in the embodiments of the present application means two or more, and other adjectives are similar thereto.
The term "determining B based on a" in the present application means that a is a factor to be considered in determining B. Not limited to "B can be determined based on A alone", it should also include: "B based on A and C", "B based on A, C and E", "C based on A, further B based on C", etc. Additionally, a may be included as a condition for determining B, for example, "when a satisfies a first condition, B is determined using a first method"; for another example, "when a satisfies the second condition, B" is determined, etc.; for another example, "when a satisfies the third condition, B" is determined based on the first parameter, and the like. Of course, a may be a condition in which a is a factor for determining B, for example, "when a satisfies the first condition, C is determined using the first method, and B is further determined based on C", or the like.
The technical scheme provided by the embodiment of the application can be suitable for various systems, in particular to a 5G system. For example, suitable systems may be global system for mobile communications (global system of mobile communication, GSM), code division multiple access (code division multiple access, CDMA), wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) universal packet Radio service (general packet Radio service, GPRS), long term evolution (long term evolution, LTE), LTE frequency division duplex (frequency division duplex, FDD), LTE time division duplex (time division duplex, TDD), long term evolution-advanced (long term evolution advanced, LTE-a), universal mobile system (universal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX), 5G New air interface (New Radio, NR), and the like. Terminal devices and network devices are included in these various systems. Core network parts such as evolved packet system (Evloved Packet System, EPS), 5G system (5 GS) etc. may also be included in the system.
The terminal device according to the embodiments of the present application may be a device that provides voice and/or data connectivity to a user, a handheld device with a wireless connection function, or other processing device connected to a wireless modem, etc. The names of the terminal devices may also be different in different systems, for example in a 5G system, the terminal devices may be referred to as User Equipment (UE). The wireless terminal device may communicate with one or more Core Networks (CNs) via a radio access Network (Radio Access Network, RAN), which may be mobile terminal devices such as mobile phones (or "cellular" phones) and computers with mobile terminal devices, e.g., portable, pocket, hand-held, computer-built-in or vehicle-mounted mobile devices that exchange voice and/or data with the radio access Network. Such as personal communication services (Personal Communication Service, PCS) phones, cordless phones, session initiation protocol (Session Initiated Protocol, SIP) phones, wireless local loop (Wireless Local Loop, WLL) stations, personal digital assistants (Personal Digital Assistant, PDAs), and the like. The wireless terminal device may also be referred to as a system, subscriber unit (subscriber unit), subscriber station (subscriber station), mobile station (mobile), remote station (remote station), access point (access point), remote terminal device (remote terminal), access terminal device (access terminal), user terminal device (user terminal), user agent (user agent), user equipment (user device), and the embodiments of the present application are not limited.
The network device according to the embodiment of the present application may be a base station, where the base station may include a plurality of cells for providing services for a terminal. A base station may also be called an access point or may be a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminal devices, or other names, depending on the particular application. The network device may be operable to exchange received air frames with internet protocol (Internet Protocol, IP) packets as a router between the wireless terminal device and the rest of the access network, which may include an Internet Protocol (IP) communication network. The network device may also coordinate attribute management for the air interface. For example, the network device according to the embodiments of the present application may be a network device (Base Transceiver Station, BTS) in a global system for mobile communications (Global System for Mobile communications, GSM) or code division multiple access (Code Division Multiple Access, CDMA), a network device (NodeB) in a wideband code division multiple access (Wide-band Code Division Multiple Access, WCDMA), an evolved network device (evolutional Node B, eNB or e-NodeB) in a long term evolution (long term evolution, LTE) system, a 5G base station (gNB) in a 5G network architecture (next generation system), a home evolved base station (Home evolved Node B, heNB), a relay node (relay node), a home base station (femto), a pico base station (pico), and the like. In some network structures, the network device may include a Centralized Unit (CU) node and a Distributed Unit (DU) node, which may also be geographically separated.
Multiple-input Multiple-output (Multi Input Multi Output, MIMO) transmissions may each be made between a network device and a terminal device using one or more antennas, and the MIMO transmissions may be Single User MIMO (SU-MIMO) or Multiple User MIMO (MU-MIMO). The MIMO transmission may be 2D-MIMO, 3D-MIMO, FD-MIMO, or massive-MIMO, or may be diversity transmission, precoding transmission, beamforming transmission, or the like, depending on the form and number of the root antenna combinations.
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Fig. 1 is one of flow diagrams of a method for estimating an uplink timing advance according to an embodiment of the present application, and referring to fig. 1, an embodiment of the present application provides a method for estimating an uplink timing advance, where an execution body of the method may be a network device such as a base station, and the method includes:
Step 101, obtaining frequency domain channel estimation at the symbol position of a demodulation reference signal DMRS of a physical uplink shared channel PUSCH;
step 102, performing uplink timing advance measurement on the frequency domain channel estimation to obtain an uplink timing advance.
Specifically, in the 5G NR system, the UE may initiate Random Access (Random Access) and PRACH (physical Random Access channel), and after receiving and detecting the PRACH, the base station sends a Random Access response to the UE, where the Random Access response includes initial TA information, and informs the UE of a timing advance of subsequent uplink transmission. After the UE confirms that the random access is successful, determining the TA of the uplink signal sent by the UE on the basis of the downlink synchronization according to the initial TA obtained by the UE, so that the time for the uplink signal sent by each UE to reach the receiving end of the base station is consistent for each UE with different positions, path transmission delays and multipath delays from the base station, thereby completing the establishment of the uplink initial synchronization.
After the uplink initial synchronization is established, the time point when the uplink signal of the UE reaches the base station receiving measurement is possibly changed along with the movement of the UE, the transformation of the transmission path, the crystal oscillator offset, the doppler shift caused by the movement and the like, so that the base station needs to maintain the uplink synchronization of each UE so as to facilitate the synchronization of uplink data transmission and control information transmission of each UE. Thus, the base station determines a TA value, i.e., an uplink timing synchronization measurement, for each UE based on measuring the uplink transmission of the corresponding UE.
The uplink timing synchronization measurement is used for measuring uplink timing deviation in a tracking stage of uplink timing, and uplink data transmission of a user must keep timing synchronization all the time, because the deviation of the timing synchronization not only can cause channel detection errors of the user, but also can bring interference among multiple users to influence signal detection performance of other users, the system must periodically track and correct the uplink timing of the user so as to prevent the user from timing deviation caused by moving distance change or unexpected link interruption.
In the case where the measured SRS does not reach the activation detection threshold, the SRS period is large, or there is no SRS scheduling, etc., the TA measurement cannot be performed using the SRS. In practice, any signal sent by the UE may be used for TA measurement, and the embodiment of the present application proposes a method for estimating an uplink timing advance, and uses PUSCH DMRS to perform TA measurement.
Firstly, obtaining frequency domain channel estimation on the symbol position of the PUSCH DMRS, and preparing for subsequent TA measurement. And then, the uplink timing advance is obtained by measuring the uplink timing advance of the frequency domain channel estimation, for example, the signal power is estimated by the frequency domain channel estimation, so that the angle offset on the PUSCH DMRS symbol is obtained, and TA is obtained by conversion, wherein the unit of TA is 1 sampling point.
According to the method for estimating the uplink timing advance, by acquiring the frequency domain channel estimation at the symbol position of the DMRS of the PUSCH and measuring the TA according to the frequency domain channel estimation, the TA is measured under the conditions that the measured SRS does not reach the activation detection threshold, the SRS period is large, or the SRS scheduling is not performed.
Optionally, according to the method for estimating the uplink timing advance in the embodiment of the present application, the obtaining the frequency domain channel estimation at the symbol position of the demodulation reference signal DMRS of the physical uplink shared channel PUSCH includes:
generating a local reference base sequence according to the related parameters;
extracting a required local reference signal according to the time-frequency domain resource mapping and the pilot frequency pattern;
extracting the pilot symbols from the local reference signal according to the time-frequency domain resource mapping and the pilot pattern and a code division multiplexing Group CDM Group;
and carrying out conjugate complex multiplication on the pilot frequency symbol and the local reference base sequence to obtain the frequency domain channel estimation.
Specifically, fig. 2 is a second flowchart of a method for estimating an uplink timing advance according to an embodiment of the present application, and referring to fig. 2, the embodiment of the present application provides a method for obtaining a frequency domain channel estimate at a symbol position of a demodulation reference signal DMRS of a physical uplink shared channel PUSCH, including:
Step 201, generating a local reference base sequence according to related parameters;
generating a local reference base sequence of a PUSCH DMRS according to related parametersWherein r is E [0, N RX -1]For receiving antenna number, l' RS For the symbol position of pilot frequency, m is the index number of base sequence, N RX For the total number of receiving antennas, the related parameters may refer to parameters used for generating a base sequence, such as PCI, slot number, etc.;
step 202, extracting a required local reference signal according to the time-frequency domain resource mapping and the pilot frequency pattern;
generating the needed local reference signal according to the time-frequency domain resource mapping and the pilot frequency pattern extraction
Step 203, extracting the pilot symbols from the local reference signals according to the code division multiplexing group according to the time-frequency domain resource mapping and the pilot pattern;
extracting received pilot symbols according to CDM Group according to resource mapping and pilot pattern, and recording the received pilot symbols asWherein g is CDM group number;
and 204, performing conjugate complex multiplication on the pilot frequency symbol and the local reference base sequence to obtain the frequency domain channel estimation.
Optionally, according to a method for estimating an uplink timing advance in an embodiment of the present application, the multiplying the pilot symbol by a conjugate complex of a locally known base sequence to obtain the frequency domain channel estimate includes:
Carrying out conjugate complex multiplication on the pilot frequency symbol and the local reference base sequence to obtain a channel frequency domain response after eliminating reference symbol modulation;
and carrying out port separation on the channel frequency domain response to obtain the frequency domain channel estimation at the symbol position of the DMRS.
Specifically, pilot symbols are to be usedTo the local known base sequence->Complex conjugate multiplication is carried out to obtain channel frequency domain response after eliminating reference symbol modulation and the port separation is carried out to obtain initial LS channel estimation +.>Wherein the method comprises the steps ofFor port number, l' RS N is the symbol position where the pilot is located v Is the total number of ports. Initial frequency domain channel estimation over all DMRS symbols in a slotMarked as->
Optionally, according to a method for estimating an uplink timing advance according to an embodiment of the present application, the performing uplink timing advance measurement on the frequency domain channel estimation to obtain an uplink timing advance includes:
and selecting the frequency domain channel estimation at the first pilot symbol position of the first port of the antenna with the largest signal-to-noise ratio measurement from the pilot symbol positions to perform uplink timing advance measurement.
Specifically, after obtaining the frequency domain channel estimation at the position of the PUSCH DMRS pilot symbol, the initial channel estimation at the frequency domain effective distribution resource of the User Equipment (UE) is taken as TA measurement, and in order to reduce complexity, only the antenna with the largest signal-to-noise ratio (SNR) is taken (denoted as r max ) To estimate and take only the first pilot symbol of the first port of the antenna for TA measurement.
Optionally, according to a method for estimating an uplink timing advance according to an embodiment of the present application, the performing uplink timing advance measurement on the frequency domain channel estimation to obtain an uplink timing advance includes:
obtaining signal power according to the frequency domain channel estimation;
the signal power is accumulated according to groups to obtain an average value;
according to the average value of the signal power, calculating the angle offset caused by the uplink timing advance;
and converting the angle offset into sampling points to obtain the uplink timing advance.
Specifically, the current method for measuring the uplink timing advance of the SRS or PUSCH DMRS mainly includes a time domain matching method or a time domain channel estimation method, wherein the time domain matching method mainly converts the SRS signal or PUSCH DMRS symbol replica into the time domain through inverse discrete fourier transform, performs sliding correlation with the received signal, searches for a correlation peak value, and further obtains an uplink timing advance adjustment value. The time domain channel estimation method mainly uses a received SRS signal or a PUSCH DMRS symbol as a channel estimation sequence, and searches a maximum peak value according to an obtained time domain channel estimation result in an uplink channel estimation window so as to obtain an uplink timing advance adjustment value. However, in the current method for calculating in the time domain, if the PUSCH DMRS uses the method for calculating the time domain uplink advance in the scene of SRS-free scheduling and the like, the PUSCH DMRS needs to be converted into the time domain and then operated, which results in limited accuracy of the calculated uplink timing advance, low accuracy and long overall calculation time.
Fig. 3 is a third flowchart of a method for estimating an uplink timing advance according to an embodiment of the present application, and referring to fig. 3, an embodiment of the present application provides a method for performing uplink timing advance measurement on the frequency domain channel estimation to obtain an uplink timing advance, where the method includes:
step 301, selecting a frequency domain channel estimation at a first pilot symbol position of a first port of an antenna with a maximum signal-to-noise ratio measurement from the pilot symbol positions;
and performing measurement calculation of the TA value by utilizing the frequency domain channel estimation on the first pilot symbol of the first port of the antenna with the maximum SNR.
Step 302, obtaining signal power according to the frequency domain channel estimation;
for receiving antenna r=r max Port, portPilot frequency l RS The calculation formula for the signal power estimate on =0 is as follows:
wherein: r=r max ,l RS ＝0,/>Frequency domain on the igroup-th packet for the user equipment iUEAnd distributing resources, wherein igroup is a positive integer. />The calculation formula of the length K of (2) is as follows:
for the number of RBs allocated on the igroup packet, and (2)> Where configuration type represents configuration type1,configuration type2 represents configuration type 2.
Step 303, the signal power is accumulated according to groups to obtain an average value;
the calculation formula for the signal power according to the group accumulation average is as follows:
Wherein N is group Is the number of RB packets.
Step 304, according to the average value of the signal power, calculating the angle offset caused by the uplink timing advance;
optionally, according to the network device of the embodiment of the present application, the calculating an angular offset caused by an uplink timing advance according to the average value of the signal power includes:
calculating the angle deflection caused by the uplink time delay;
and calculating a phase angle corresponding to the uplink timing advance unit.
Specifically, the calculation formula for calculating the angular deflection due to the upward delay is as follows:
the calculation formula for calculating the phase angle corresponding to 1 TA unit is as follows:
wherein: n (N) FFT For sampling point number N TA For 1 TA corresponding sample number, N TA The calculation formula of (2) is as follows:
wherein ceil is the rounding operation, F s For the sampling rate, SCS is the subcarrier spacing.
Step 305, converting the angle offset into a sampling point number to obtain the uplink timing advance;
optionally, according to a method for estimating an uplink timing advance according to an embodiment of the present application, the converting the angular offset into a sampling point number, to obtain the uplink timing advance includes:
and calculating the uplink timing advance according to the angle deflection and the phase angle corresponding to the uplink timing advance unit.
Specifically, the calculation formula for calculating the TA estimation value is as follows:
wherein,for angular deflection due to upstream delay, < >>Phase angle corresponding to 1 TA unit, N 0 The number of subcarriers spaced by adjacent DMRS in the frequency domain is represented.
Where for configuration type & ports 1001-1007 represent for configuration type1 and ports 1001-2007,for configuration type1&port1001-1007 represent for configuration type 2 and ports 1001-10011.
According to the method for estimating the uplink timing advance, the uplink channel time delay is measured by solving the angle offset, so that the precision of the solved uplink timing advance is improved, the accuracy is improved, and the calculation time consumption is reduced. The method for estimating the uplink timing advance provided by the embodiment of the application can acquire a more accurate TA value without time-frequency domain conversion, and greatly reduces the time consumption of an estimation process. Meanwhile, the time delay estimation is carried out by utilizing the frequency domain phase, and the time delay estimation method is more accurate than the time domain estimation method under the condition of smaller sampling points, so that the efficiency and the accuracy of the time delay estimation are improved under a certain scene.
The methods provided in each of the above embodiments of the present application are illustrated by the following specific examples.
The method for estimating the uplink timing advance provided in embodiment 1 and the embodiments of the present application are applied to the following scenarios: when the terminal adjusts the TA, but no SRS signal is up, the uplink synchronization and demodulation at this time need to use the TA measured by the PUSCH DMRS;
the frequency domain channel estimation at the DMRS symbol position of PUSCH is obtained to obtain the uplink timing advance, for example, the signal power is estimated by the frequency domain channel estimation, so as to obtain the angular offset at the DMRS symbol of PUSCH, and the TA is obtained by conversion.
The method for estimating the uplink timing advance provided in embodiment 2 and the embodiments of the present application are applied to the following scenarios: under the scene that the SRS signal activation detection threshold is not exceeded, the TA requiring the measurement of the PUSCH DMRS; the frequency domain channel estimation at the DMRS symbol position of PUSCH is obtained to obtain the uplink timing advance, for example, the signal power is estimated by the frequency domain channel estimation, so as to obtain the angular offset at the DMRS symbol of PUSCH, and the TA is obtained by conversion.
The method for estimating the uplink timing advance provided in embodiment 3 and the embodiments of the present application are applied to the following scenarios: the period of SRS signal is larger (more than 80 ms), or TA measured by PUSCH DMRS is needed when there is no SRS scheduling; the frequency domain channel estimation at the DMRS symbol position of PUSCH is obtained to obtain the uplink timing advance, for example, the signal power is estimated by the frequency domain channel estimation, so as to obtain the angular offset at the DMRS symbol of PUSCH, and the TA is obtained by conversion.
The method for estimating the uplink timing advance provided in embodiment 4 and the embodiments of the present application are applied to the following scenarios: the PUSCH DMRS performs TA measurement in a schedule according to a certain period, for example, taking a period of 5 ms or 10 ms as an example, and is used for supplementing a TA sample value of SRS signal measurement; the frequency domain channel estimation at the DMRS symbol position of PUSCH is obtained to obtain the uplink timing advance, for example, the signal power is estimated by the frequency domain channel estimation, so as to obtain the angular offset at the DMRS symbol of PUSCH, and the TA is obtained by conversion.
The method for estimating the uplink timing advance provided by the embodiment of the invention can rapidly and accurately provide the TA reference value for uplink synchronization in various scenes and has important application value.
Fig. 4 is a schematic structural diagram of a network device according to an embodiment of the present application, as shown in fig. 4, where the network device includes a memory 420, a transceiver 400, and a processor 410, where:
a memory 420 for storing a computer program; a transceiver 400 for transceiving data under the control of the processor 410; a processor 410 for reading the computer program in the memory 420 and performing the following operations:
acquiring frequency domain channel estimation on a demodulation reference signal DMRS symbol position of a physical uplink shared channel PUSCH;
And carrying out uplink timing advance measurement on the frequency domain channel estimation to obtain the uplink timing advance.
Specifically, the transceiver 400 is configured to receive and transmit data under the control of the processor 410. Wherein in fig. 4, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors represented by processor 410 and various circuits of memory represented by memory 420, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. Bus interface 430 provides an interface. Transceiver 400 may be a number of elements, including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium, including wireless channels, wired channels, optical cables, etc. The processor 410 is responsible for managing the bus architecture and general processing, and the memory 420 may store data used by the processor 410 in performing operations.
The processor 410 may be a central processing unit (Central Processing Unit, CPU), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a Field programmable gate array (Field-Programmable Gate Array, FPGA) or a complex programmable logic device (Complex Programmable Logic Device, CPLD), or may employ a multi-core architecture.
Optionally, according to the network device of the embodiment of the present application, the obtaining the frequency domain channel estimation at the symbol position of the demodulation reference signal DMRS of the physical uplink shared channel PUSCH includes:
generating a local reference base sequence according to the related parameters;
extracting a required local reference signal according to the time-frequency domain resource mapping and the pilot frequency pattern;
extracting the pilot symbols from the local reference signal according to the time-frequency domain resource mapping and the pilot pattern and a code division multiplexing Group CDM Group;
and carrying out conjugate complex multiplication on the pilot frequency symbol and the local reference base sequence to obtain the frequency domain channel estimation.
Optionally, according to the network device of the embodiment of the present application, the multiplying the pilot symbol by a conjugate complex of a locally known base sequence to obtain the frequency domain channel estimate includes:
carrying out conjugate complex multiplication on the pilot frequency symbol and the local reference base sequence to obtain a channel frequency domain response after eliminating reference symbol modulation;
and carrying out port separation on the channel frequency domain response to obtain the frequency domain channel estimation at the symbol position of the DMRS.
Optionally, according to the network device of the embodiment of the present application, the performing uplink timing advance measurement on the frequency domain channel estimation to obtain an uplink timing advance includes:
And selecting the frequency domain channel estimation at the first pilot symbol position of the first port of the antenna with the largest signal-to-noise ratio measurement from the pilot symbol positions to perform uplink timing advance measurement.
Optionally, according to the network device of the embodiment of the present application, the performing uplink timing advance measurement on the frequency domain channel estimation to obtain an uplink timing advance includes:
obtaining signal power according to the frequency domain channel estimation;
the signal power is accumulated according to groups to obtain an average value;
according to the average value of the signal power, calculating the angle offset caused by the uplink timing advance;
and converting the angle offset into sampling points to obtain the uplink timing advance.
Optionally, according to the network device of the embodiment of the present application, the calculating an angular offset caused by an uplink timing advance according to the average value of the signal power includes:
calculating the angle deflection caused by the uplink time delay;
and calculating a phase angle corresponding to the uplink timing advance unit.
Optionally, according to the network device of the embodiment of the present application, the converting the angle offset into a sampling point number, to obtain the uplink timing advance includes:
And calculating the uplink timing advance according to the angle deflection and the phase angle corresponding to the uplink timing advance unit.
It should be noted that, the network device provided in this embodiment of the present application can implement all the method steps implemented by the method embodiment in which the execution body is a network device, and can achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those of the method embodiment in this embodiment are omitted.
The embodiment of the application provides a method and a device for estimating uplink timing advance, which are used for solving the defect that in the prior art, under the conditions that a measured SRS does not reach an activation detection threshold, the SRS period is larger, or SRS scheduling is not available, TA measurement is difficult to carry out, and realizing TA measurement based on a demodulation reference signal DMRS of a physical uplink shared channel PUSCH. The method and the device are based on the same application, and because the principles of solving the problems by the method and the device are similar, the implementation of the device and the method can be referred to each other, and the repetition is not repeated.
Fig. 5 is a schematic structural diagram of an apparatus for estimating an uplink timing advance according to an embodiment of the present application, and referring to fig. 5, the apparatus for estimating an uplink timing advance according to an embodiment of the present application includes:
A frequency domain channel estimation unit 501, configured to obtain a frequency domain channel estimation at a symbol position of a demodulation reference signal DMRS of a physical uplink shared channel PUSCH;
and an uplink timing advance measurement unit 502, configured to measure the uplink timing advance for the frequency domain channel estimation, so as to obtain the uplink timing advance.
It should be noted that, in the embodiment of the present application, the division of the units is schematic, which is merely a logic function division, and other division manners may be implemented in actual practice. In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a processor-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution, in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Optionally, the apparatus for estimating an uplink timing advance according to the embodiment of the present application, the obtaining a frequency domain channel estimate at a symbol position of a demodulation reference signal DMRS of a physical uplink shared channel PUSCH includes:
generating a local reference base sequence according to the related parameters;
extracting a required local reference signal according to the time-frequency domain resource mapping and the pilot frequency pattern;
extracting the pilot symbols from the local reference signal according to the time-frequency domain resource mapping and the pilot pattern and a code division multiplexing Group CDM Group;
and carrying out conjugate complex multiplication on the pilot frequency symbol and the local reference base sequence to obtain the frequency domain channel estimation.
Optionally, the apparatus for estimating an uplink timing advance according to the embodiment of the present application multiplies the pilot symbol by a conjugate complex of a locally known base sequence to obtain the frequency domain channel estimate, including:
carrying out conjugate complex multiplication on the pilot frequency symbol and the local reference base sequence to obtain a channel frequency domain response after eliminating reference symbol modulation;
and carrying out port separation on the channel frequency domain response to obtain the frequency domain channel estimation at the symbol position of the DMRS.
Optionally, according to an embodiment of the present application, the device for estimating an uplink timing advance measures the uplink timing advance for the frequency domain channel estimation, to obtain the uplink timing advance, including:
and selecting the frequency domain channel estimation at the first pilot symbol position of the first port of the antenna with the largest signal-to-noise ratio measurement from the pilot symbol positions to perform uplink timing advance measurement.
Optionally, according to an embodiment of the present application, the device for estimating an uplink timing advance measures the uplink timing advance for the frequency domain channel estimation, to obtain the uplink timing advance, including:
obtaining signal power according to the frequency domain channel estimation;
the signal power is accumulated according to groups to obtain an average value;
according to the average value of the signal power, calculating the angle offset caused by the uplink timing advance;
and converting the angle offset into sampling points to obtain the uplink timing advance.
Optionally, the device for estimating the uplink timing advance according to the embodiment of the present application, where the calculating an angular offset caused by the uplink timing advance according to the average value of the signal power includes:
Calculating the angle deflection caused by the uplink time delay;
and calculating a phase angle corresponding to the uplink timing advance unit.
Optionally, according to an embodiment of the present application, the device for estimating an uplink timing advance converts the angular offset into a sampling point number, to obtain the uplink timing advance, including:
and calculating the uplink timing advance according to the angle deflection and the phase angle corresponding to the uplink timing advance unit.
It should be noted that, the above device provided in the embodiment of the present invention can implement all the method steps implemented in the method embodiment and achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those in the method embodiment in this embodiment are omitted.
In another aspect, embodiments of the present application further provide a processor readable storage medium storing a computer program, where the computer program is configured to cause the processor to perform the method provided in the foregoing embodiments, where the method includes:
acquiring frequency domain channel estimation on a demodulation reference signal DMRS symbol position of a physical uplink shared channel PUSCH;
and carrying out uplink timing advance measurement on the frequency domain channel estimation to obtain the uplink timing advance.
The processor-readable storage medium may be any available medium or data storage device that can be accessed by a processor, including, but not limited to, magnetic storage (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical storage (e.g., CD, DVD, BD, HVD, etc.), semiconductor storage (e.g., ROM, EPROM, EEPROM, nonvolatile storage (NAND FLASH), solid State Disk (SSD)), and the like.
Optionally, the obtaining the frequency domain channel estimation at the symbol position of the demodulation reference signal DMRS of the physical uplink shared channel PUSCH includes:
generating a local reference base sequence according to the related parameters;
extracting a required local reference signal according to the time-frequency domain resource mapping and the pilot frequency pattern;
extracting the pilot symbols from the local reference signal according to the time-frequency domain resource mapping and the pilot pattern and a code division multiplexing Group CDM Group;
and carrying out conjugate complex multiplication on the pilot frequency symbol and the local reference base sequence to obtain the frequency domain channel estimation.
Optionally, the processor readable storage medium according to an embodiment of the present application, where the multiplying the pilot symbol by a conjugate complex of a locally known base sequence to obtain the frequency domain channel estimate includes:
Carrying out conjugate complex multiplication on the pilot frequency symbol and the local reference base sequence to obtain a channel frequency domain response after eliminating reference symbol modulation;
and carrying out port separation on the channel frequency domain response to obtain the frequency domain channel estimation at the symbol position of the DMRS.
Optionally, according to an embodiment of the present application, the performing uplink timing advance measurement on the frequency domain channel estimation to obtain an uplink timing advance includes:
and selecting the frequency domain channel estimation at the first pilot symbol position of the first port of the antenna with the largest signal-to-noise ratio measurement from the pilot symbol positions to perform uplink timing advance measurement.
Optionally, according to an embodiment of the present application, the performing uplink timing advance measurement on the frequency domain channel estimation to obtain an uplink timing advance includes:
obtaining signal power according to the frequency domain channel estimation;
the signal power is accumulated according to groups to obtain an average value;
according to the average value of the signal power, calculating the angle offset caused by the uplink timing advance;
and converting the angle offset into sampling points to obtain the uplink timing advance.
Optionally, according to an embodiment of the present application, the calculating an angular offset caused by an uplink timing advance according to the average value of the signal power includes:
calculating the angle deflection caused by the uplink time delay;
and calculating a phase angle corresponding to the uplink timing advance unit.
Optionally, according to an embodiment of the present application, the converting the angle offset into a sampling point number, to obtain the uplink timing advance includes:
and calculating the uplink timing advance according to the angle deflection and the phase angle corresponding to the uplink timing advance unit.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These processor-executable instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.
Claims (16)
1. A method of estimating an uplink timing advance, comprising:
acquiring frequency domain channel estimation on a demodulation reference signal DMRS symbol position of a physical uplink shared channel PUSCH;
and carrying out uplink timing advance measurement on the frequency domain channel estimation to obtain the uplink timing advance.
2. The method for estimating an uplink timing advance according to claim 1, wherein the obtaining the frequency domain channel estimate at the DMRS symbol position of the demodulation reference signal of the physical uplink shared channel PUSCH includes:
Generating a local reference base sequence according to the related parameters;
extracting a required local reference signal according to the time-frequency domain resource mapping and the pilot frequency pattern;
extracting the pilot symbols from the local reference signal according to the time-frequency domain resource mapping and the pilot pattern and a code division multiplexing Group CDM Group;
and carrying out conjugate complex multiplication on the pilot frequency symbol and the local reference base sequence to obtain the frequency domain channel estimation.
3. The method of estimating an uplink timing advance according to claim 2 wherein the multiplying the pilot symbols by a locally known base sequence by a complex conjugate, to obtain the frequency domain channel estimate, comprises:
carrying out conjugate complex multiplication on the pilot frequency symbol and the local reference base sequence to obtain a channel frequency domain response after eliminating reference symbol modulation;
and carrying out port separation on the channel frequency domain response to obtain the frequency domain channel estimation at the symbol position of the DMRS.
4. A method for estimating an uplink timing advance according to any one of claims 1 to 3, wherein the performing uplink timing advance measurement on the frequency domain channel estimate to obtain the uplink timing advance includes:
And selecting the frequency domain channel estimation at the first pilot symbol position of the first port of the antenna with the largest signal-to-noise ratio measurement from the pilot symbol positions to perform uplink timing advance measurement.
5. The method for estimating an uplink timing advance according to claim 4, wherein the performing uplink timing advance measurement on the frequency domain channel estimate to obtain the uplink timing advance includes:
obtaining signal power according to the frequency domain channel estimation;
the signal power is accumulated according to groups to obtain an average value;
according to the average value of the signal power, calculating the angle offset caused by the uplink timing advance;
and converting the angle offset into sampling points to obtain the uplink timing advance.
6. The method of estimating an uplink timing advance according to claim 5, wherein the calculating an angular offset caused by the uplink timing advance from the average value of the signal power includes:
calculating the angle deflection caused by the uplink time delay;
and calculating a phase angle corresponding to the uplink timing advance unit.
7. The method for estimating an uplink timing advance according to claim 6, wherein the converting the angular offset into a number of sampling points to obtain the uplink timing advance includes:
And calculating the uplink timing advance according to the angle deflection and the phase angle corresponding to the uplink timing advance unit.
8. A network device comprising a memory, a transceiver, and a processor;
the memory is used for storing a computer program; the transceiver is used for receiving and transmitting data under the control of the processor; the processor is configured to read the computer program in the memory and perform the following operations:
acquiring frequency domain channel estimation on a demodulation reference signal DMRS symbol position of a physical uplink shared channel PUSCH;
and carrying out uplink timing advance measurement on the frequency domain channel estimation to obtain the uplink timing advance.
9. The network device of claim 8, wherein the obtaining the frequency domain channel estimate at the DMRS symbol position of the demodulation reference signal of the physical uplink shared channel PUSCH comprises:
generating a local reference base sequence according to the related parameters;
extracting a required local reference signal according to the time-frequency domain resource mapping and the pilot frequency pattern;
extracting the pilot symbols from the local reference signal according to the time-frequency domain resource mapping and the pilot pattern and a code division multiplexing Group CDM Group;
And carrying out conjugate complex multiplication on the pilot frequency symbol and the local reference base sequence to obtain the frequency domain channel estimation.
10. The network device of claim 9, wherein said complex conjugate multiplying the pilot symbols with a locally known base sequence to obtain the frequency domain channel estimate comprises:
carrying out conjugate complex multiplication on the pilot frequency symbol and the local reference base sequence to obtain a channel frequency domain response after eliminating reference symbol modulation;
and carrying out port separation on the channel frequency domain response to obtain the frequency domain channel estimation at the symbol position of the DMRS.
11. The network device according to any one of claims 8 to 10, wherein said performing uplink timing advance measurement on the frequency domain channel estimate to obtain an uplink timing advance comprises:
and selecting the frequency domain channel estimation at the first pilot symbol position of the first port of the antenna with the largest signal-to-noise ratio measurement from the pilot symbol positions to perform uplink timing advance measurement.
12. The network device of claim 11, wherein the performing uplink timing advance measurement on the frequency domain channel estimate to obtain the uplink timing advance comprises:
Obtaining signal power according to the frequency domain channel estimation;
the signal power is accumulated according to groups to obtain an average value;
according to the average value of the signal power, calculating the angle offset caused by the uplink timing advance;
and converting the angle offset into sampling points to obtain the uplink timing advance.
13. The network device of claim 12, wherein the determining an angular offset caused by an upstream timing advance from the average of the signal power comprises:
calculating the angle deflection caused by the uplink time delay;
and calculating a phase angle corresponding to the uplink timing advance unit.
14. The network device of claim 13, wherein the converting the angular offset into a number of sampling points to obtain the uplink timing advance comprises:
and calculating the uplink timing advance according to the angle deflection and the phase angle corresponding to the uplink timing advance unit.
15. An apparatus for estimating an uplink timing advance, comprising:
the frequency domain channel estimation unit is used for acquiring frequency domain channel estimation at the symbol position of a demodulation reference signal DMRS of a physical uplink shared channel PUSCH;
And the uplink timing advance measuring unit is used for measuring the uplink timing advance of the frequency domain channel estimation to obtain the uplink timing advance.
16. A processor-readable storage medium, characterized in that the processor-readable storage medium stores a computer program for causing the processor to perform the method of any one of claims 1 to 7.
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