CN113115428B - Uplink synchronization adjustment method and device - Google Patents

Uplink synchronization adjustment method and device Download PDF

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CN113115428B
CN113115428B CN202010027851.0A CN202010027851A CN113115428B CN 113115428 B CN113115428 B CN 113115428B CN 202010027851 A CN202010027851 A CN 202010027851A CN 113115428 B CN113115428 B CN 113115428B
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command
dmrs
srs
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issuing
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CN113115428A (en
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常博
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Datang Mobile Communications Equipment Co Ltd
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Datang Mobile Communications Equipment Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

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Abstract

The embodiment of the invention provides an uplink synchronization adjustment method and device. The method is applied to network side equipment, and comprises the following steps: acquiring a channel Sounding Reference Signal (SRS) and a demodulation reference signal (DMRS) of a terminal; measuring a first Timing Advance (TA) based on the SRS and a second TA based on the DMRS; if the first TA and the second TA are in the same direction and are both valid TAs, determining a target TA based on the first TA and the second TA; and carrying the target TA in a first TA command, and sending the first TA command to the terminal. The embodiment of the invention solves the problem that the measurement error is larger when the network side measures TA through the PRACH in the prior art.

Description

Uplink synchronization adjustment method and device
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to an uplink synchronization adjustment method and apparatus.
Background
In a wireless communication system, an important characteristic of uplink transmission is that different User equipments (also called terminal User Equipment, UE) implement Orthogonal Multiple Access (OMA) in time and frequency, that is, uplink transmissions from different UEs in the same cell do not interfere with each other.
To ensure orthogonality of uplink transmissions and avoid Intra-Cell (Intra-Cell) interference, the base station requires that signals from UEs in the same subframe but different frequency domain resources (different resource blocks RB) arrive at the base station substantially aligned in time. The base station can correctly decode the uplink data as long as it receives the uplink data sent by the UE within the Cyclic Prefix (CP) range, so that the uplink synchronization requires that the time when signals from different UEs in the same subframe reach the base station falls within the CP.
In order to ensure time synchronization on the receiving side (base station side), a mechanism of Uplink Timing Advance (UTA) is proposed on the network side.
For the UE, Timing Advance (TA) is essentially a Negative Offset between the start time of receiving the downlink subframe and the time of transmitting the uplink subframe. The base station can control the arrival time of uplink signals from different UEs at the base station by appropriately controlling the offset of each UE. For the UE farther from the base station, due to the larger transmission delay, the UE closer to the base station is required to transmit the uplink data earlier.
Different UE and base station have different distances, and different UE have different moving speed and moving azimuth relative to the base station, so the base station can individually control and adjust the uplink time delay of each UE, so as to ensure that the time points of uplink data reaching the base station are consistent under different scenes of different terminals.
In the prior art, a network side usually measures TA through a Physical Random Access Channel (PRACH), and a measurement error of the TA is large, which causes an unsatisfactory uplink synchronization position and finally affects uplink demodulation performance.
Disclosure of Invention
The embodiment of the invention provides an uplink synchronization adjustment method and device, which are used for solving the problem that in the prior art, a network side measures TA through a PRACH (physical random access channel), and the measurement error is large.
In one aspect, an embodiment of the present invention provides an uplink synchronization adjustment method, which is applied to a network side device, and the method includes:
acquiring a channel Sounding Reference Signal (SRS) and a demodulation reference signal (DMRS) of a terminal;
measuring a first Timing Advance (TA) based on the SRS and a second TA based on the DMRS;
if the first TA and the second TA are in the same direction and are both valid TAs, determining a target TA based on the first TA and the second TA;
and carrying the target TA in a first TA command, and sending the first TA command to the terminal.
Optionally, after the step of issuing the first TA command to the terminal, the method further includes:
determining the issuing period of the TA command;
if the current time is in the issuing period or the direction of a third TA continuous first preset number of times measured based on the SRS is the same, judging whether the third TA is effective:
if the third TA is valid, carrying the third TA in a second TA command, and sending the second TA command to the terminal;
and if the third TA is invalid, judging whether a fourth TA based on the DMRS measurement is valid.
Optionally, after the step of determining whether the fourth TA based on the DMRS measurement is valid, the method comprises:
if the fourth TA is valid, carrying the fourth TA in a third TA command, and sending the third TA command to the terminal;
and if the fourth TA is invalid, carrying the target TA in a fourth TA command, and issuing the fourth TA command to the terminal.
Optionally, the step of determining an issuing period of the TA command includes:
measuring a frequency offset value based on the DMRS;
and determining the issuing period of the TA command according to the frequency deviation value and the preset central frequency point of the network side equipment.
Optionally, the valid TA is that the received signal power of the source parameter of the TA is greater than a preset power threshold, and the signal-to-noise ratio of the received signal of the source parameter is greater than a preset signal-to-noise ratio threshold;
the source parameter is SRS or DMRS.
Optionally, the step of obtaining a channel sounding reference signal SRS and a demodulation reference signal DMRS of the terminal includes:
and when detecting that the terminal is accessed to the cell of the network side equipment, acquiring a channel Sounding Reference Signal (SRS) and a demodulation reference signal (DMRS) of the terminal.
On the other hand, an embodiment of the present invention further provides an uplink synchronization adjusting apparatus, which is applied to a network side device, and the apparatus includes:
the parameter acquisition module is used for acquiring a channel Sounding Reference Signal (SRS) and a demodulation reference signal (DMRS) of the terminal;
a TA measurement module to measure a first Timing Advance (TA) based on the SRS and a second TA based on the DMRS;
a TA determining module, configured to determine a target TA based on a first TA and a second TA if the first TA and the second TA are in the same direction and are both valid TAs;
and the TA issuing module is used for carrying the target TA in a first TA command and issuing the first TA command to the terminal.
Optionally, the apparatus further comprises:
the period determining module is used for determining the issuing period of the TA command;
a first determining module, configured to determine whether a third TA measured based on the SRS is valid if the current time is within the delivery period or a direction of a first preset number of consecutive times of the third TA is the same:
a first sending module, configured to carry the third TA in a second TA command and send the second TA command to the terminal if the third TA is valid;
and a second determining module, configured to determine whether a fourth TA measured based on the DMRS is valid if the third TA is invalid.
Optionally, the apparatus comprises:
a second issuing module, configured to, after the second determining module determines whether a fourth TA based on the DMRS measurement is valid,
if the fourth TA is valid, carrying the fourth TA in a third TA command, and sending the third TA command to the terminal;
and if the fourth TA is invalid, carrying the target TA in a fourth TA command, and issuing the fourth TA command to the terminal.
Optionally, the period determining module includes:
a measurement sub-module to measure a frequency offset value based on the DMRS;
and the determining submodule is used for determining the issuing period of the TA command according to the frequency deviation value and the preset central frequency point of the network side equipment.
Optionally, the valid TA is that the received signal power of the source parameter of the TA is greater than a preset power threshold, and the signal-to-noise ratio of the received signal of the source parameter is greater than a preset signal-to-noise ratio threshold;
the source parameter is SRS or DMRS.
Optionally, the parameter obtaining module is configured to:
and when detecting that the terminal is accessed to the cell of the network side equipment, acquiring a channel Sounding Reference Signal (SRS) and a demodulation reference signal (DMRS) of the terminal.
In still another aspect, an embodiment of the present invention further provides an electronic device, where the electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor, when executing the computer program, implements the steps in the uplink synchronization adjustment method described above.
In another aspect, an embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps in the uplink synchronization adjustment method described above are implemented.
In the embodiment of the invention, a reference signal SRS and a demodulation reference signal DMRS are detected by acquiring a channel of a terminal; measuring a first amount, TA, based on the SRS and a second TA based on the DMRS; if the first TA and the second TA are in the same direction and are both valid TAs, determining a target TA based on the first TA and the second TA; carrying the target TA in a first TA command, and issuing the first TA command to the terminal; TA is measured based on SRS and DMRS, TA measurement precision is improved, uplink synchronization is quickly adjusted, and uplink data arrival time consistency is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a flowchart illustrating steps of an uplink synchronization adjustment method according to an embodiment of the present invention;
fig. 2 is a second flowchart illustrating steps of an uplink synchronization adjustment method according to an embodiment of the present invention;
fig. 3 is a block diagram of an uplink synchronization adjustment apparatus according to an embodiment of the present invention;
fig. 4 is a block diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In various embodiments of the present invention, it should be understood that the sequence numbers of the following processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
In the embodiments provided herein, it should be understood that "B corresponding to A" means that B is associated with A from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.
Fig. 1 shows a flowchart of an uplink synchronization adjustment method according to an embodiment of the present invention.
As shown in fig. 1, an uplink synchronization adjustment method provided in an embodiment of the present invention is applied to a network side device, where the network side device may be a Base Station (BS), and the BS is a device deployed in an access network to provide a wireless communication function for a UE. The base stations may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. In systems using different Radio access technologies, names of devices having a base station function may be different, for example, in a 5G New Radio (NR) system, called a nodeb or a gNB. As mobile communication technology evolves, the name "base station" may change. For convenience of description, in the embodiment of the present invention, the apparatus for providing a wireless communication function for a UE is collectively referred to as a network side device.
The method comprises the following steps:
step 101, acquiring a channel Sounding Reference Signal (SRS) and a demodulation reference signal (DMRS) of a terminal.
Wherein, Sounding Reference Signal (SRS) is an uplink Reference Signal, and is sent by the UE to the network side equipment, where the SRS is used for the network side equipment to schedule network resources for the UE as a Reference; in a wireless communication network, a network side device generally allocates a partial region of a system bandwidth to a specific UE, and allocates a specific frequency region resource to the UE within a specific time.
The SRS is located in a last Single-carrier Frequency-Division Multiple Access (SC-FDMA) symbol of a subframe, and is periodically transmitted regardless of uplink data transmission, and the SRS is periodically reported and is used as a scheduling reference, so that the network side detects a time alignment state of the UE through the SRS.
Demodulation Reference signals (DMRSs) exist in a Physical Uplink Shared Channel (PUSCH) and a Physical Uplink Control Channel (PUCCH), and are used for a network side device to estimate an Uplink Channel from the same frequency position.
The method comprises the steps that when UE is accessed or switched to a cell covered by the network side equipment, the network side equipment acquires the SRS and the DMRS of the UE.
Step 102, measuring a first timing advance, TA, based on the SRS and a second TA based on the DMRS.
The network side equipment obtains the SRS and the DMRS of the UE, measures a first TA based on the SRS, and measures a second TA based on the DMRS.
Specifically, the TA is used for UE uplink transmission, and in order to send an uplink data packet of the UE to the network side device at a preset time, a radio frequency transmission delay caused by a distance is estimated to send out the data packet at a corresponding time in advance.
In order to improve the measurement accuracy of the TAs, the network side device obtains two TAs based on SRS and DMRS measurements, respectively. DMRS is placed in the fourth block in every 0.5 msec slot, with two DMRS in one subframe; the SRS is placed in the last block of one subframe, the network side determines the arrival time of the SRS and the DMRS respectively based on the positions of the SRS and the DMRS, and then determines the corresponding TA respectively according to the time difference between the respective arrival time and the transmission time of the last downlink subframe.
Step 103, if the first TA and the second TA are in the same direction and both are valid TAs, determining a target TA based on the first TA and the second TA.
For the UE, even if the measured source parameters (i.e., DMRS or SRS) are different, the TA of the same subframe is theoretically the same, and a certain deviation is inevitably present in the actual measurement process; therefore, in the embodiment of the present invention, the TAs are measured based on the two source parameters, and then the final target TA is determined based on the two measured TAs.
Specifically, for the same subframe, if the first TA and the second TA are in the same direction and both are valid TAs, the TA may be determined to be the target TA; the effective TA is that the received signal power of the source parameter of the TA is greater than a preset power threshold, and the signal-to-noise ratio of the received signal of the source parameter is greater than a preset signal-to-noise ratio threshold; the source parameter is SRS or DMRS. For example, for the first TA, if the SRS has a received signal power higher than a preset power threshold of the SRS and a signal-to-noise ratio greater than a preset signal-to-noise ratio threshold of the SRS, the first TA is determined to be a valid TA.
The first TA and the second TA are in the same direction, namely the offset directions (or time advance or time delay) of the first TA and the second TA are the same; in addition, if the two values are different, the target TA may be determined by taking an average value.
And step 104, carrying the target TA in a first TA command, and sending the first TA command to the terminal.
The network side device informs the UE of the time of Timing Advance by sending a Timing Advance Command (TAC) to the UE; therefore, the network side device carries the target TA in a first TA command, and issues the first TA command to the terminal.
In the embodiment of the invention, a SRS and a DMRS are detected by acquiring a channel of a terminal; measuring a first amount, TA, based on the SRS and a second TA based on the DMRS; if the first TA and the second TA are in the same direction and are both valid TAs, determining a target TA based on the first TA and the second TA; carrying the target TA in a first TA command, and issuing the first TA command to the terminal; TA is measured based on SRS and DMRS, TA measurement precision is improved, uplink synchronization is quickly adjusted, and uplink data arrival time consistency is improved. The embodiment of the invention solves the problem that the measurement error is larger when the network side measures TA through the PRACH in the prior art.
Referring to fig. 2, another embodiment of the present invention provides an uplink synchronization adjustment method, which is applied to a network device, and the method includes:
step 201, acquiring a channel sounding reference signal SRS and a demodulation reference signal DMRS of a terminal.
The SRS is an uplink reference signal, and is sent to network side equipment by the UE and used for the network side equipment to schedule network resources for the UE as reference; in a wireless communication network, a network side device generally allocates a partial region of a system bandwidth to a specific UE, and allocates a specific frequency region resource to the UE within a specific time.
The SRS is positioned at the last SC-FDMA symbol of a subframe, the periodic transmission is irrelevant to uplink data transmission, and the network side detects the time alignment state of the UE through the SRS besides being used as a scheduling reference because the SRS is periodically reported.
DMRS exists in PUSCH and PUCCH, and is used for a network device to evaluate an uplink channel from the same frequency location.
The method comprises the steps that when UE is accessed or switched to a cell covered by the UE, network side equipment acquires an SRS and a DMRS of the UE.
Step 202, measuring a first timing advance, TA, based on the SRS and a second TA based on the DMRS.
The network side equipment obtains the SRS and the DMRS of the UE, measures a first TA based on the SRS, and measures a second TA based on the DMRS.
Specifically, the TA is used for UE uplink transmission, and in order to send an uplink data packet of the UE to the network side device at a preset time, a radio frequency transmission delay caused by a distance is estimated to send out the data packet at a corresponding time in advance.
In order to improve the measurement accuracy of the TAs, the network side device obtains two TAs based on SRS and DMRS measurements, respectively. DMRS is placed in the fourth block in every 0.5 msec slot, with two DMRS in one subframe; the SRS is placed in the last block of one subframe, the network side determines the arrival time of the SRS and the DMRS respectively based on the positions of the SRS and the DMRS, and then determines the corresponding TA respectively according to the time difference between the respective arrival time and the transmission time of the last downlink subframe.
In step 203, if the first TA and the second TA are in the same direction and both are valid TAs, a target TA is determined based on the first TA and the second TA.
For the UE, even if the measured source parameters (i.e., DMRS or SRS) are different, the TA of the same subframe is theoretically the same, and a certain deviation is inevitably present in the actual measurement process; therefore, in the embodiment of the present invention, the TAs are measured based on the two source parameters, and then the final target TA is determined based on the two measured TAs.
Specifically, for the same subframe, if the first TA and the second TA are in the same direction and both are valid TAs, the TA may be determined to be the target TA; the effective TA is that the received signal power of the source parameter of the TA is greater than a preset power threshold, and the signal-to-noise ratio of the received signal of the source parameter is greater than a preset signal-to-noise ratio threshold; the source parameter is SRS or DMRS. For example, for the first TA, if the SRS has a received signal power higher than a preset power threshold of the SRS and a signal-to-noise ratio greater than a preset signal-to-noise ratio threshold of the SRS, the first TA is determined to be a valid TA.
The first TA and the second TA are in the same direction, namely the offset directions (or time advance or time delay) of the first TA and the second TA are the same; in addition, if the two values are different, the target TA may be determined by taking an average value.
And step 204, carrying the target TA in a first TA command, and issuing the first TA command to the terminal.
The network side equipment informs the UE of the time of timing advance by sending the TAC to the UE; therefore, the network side device carries the target TA in a first TA command, and issues the first TA command to the terminal.
Step 205, determining the issuing period of the TA command.
The issuing period of the TA command is the issuing period of all TA commands of the network side equipment; and when the issuing period of the TA command is reached, the network side equipment sends the TA command to the UE.
Step 206, if the current time is in the sending period or the direction of the third TA measured based on the SRS is the same as the direction of the first preset number of consecutive times, determining whether the third TA is valid.
If the current time reaches the issuing period of the TA command, or the direction of the third TA measured by the network side equipment based on the SRS is the same as the direction of the first preset number of continuous times, judging whether the third TA measured by the current SRS is effective or not.
The first preset number may be any positive integer, for example, when the first preset number is 3, the network side device continues to have the same 3-th-order direction based on the third TA measured by the SRS;
and judging whether the third TA based on the SRS measurement is effective, namely judging that the received signal power of the SRS is higher than the preset power threshold of the SRS, and the signal-to-noise ratio is higher than the preset signal-to-noise ratio threshold of the SRS, and determining that the third TA is the effective TA.
Step 207, if the third TA is valid, the third TA is carried in a second TA command, and the second TA command is issued to the terminal.
And if the third TA is valid, taking the third TA as a target TA, carrying the third TA in a second TA command, and issuing the second TA command to the terminal.
And step 208, if the third TA is invalid, determining whether a fourth TA measured based on the DMRS is valid.
And if the third TA is invalid, determining whether the fourth TA is taken as the target TA based on the fourth TA measured by the current DMRS and according to whether the fourth TA is valid.
In the above embodiment, the variation trend of the uplink channel quality is grasped in real time through the SRS and the DMRS, and the value of the TA is adjusted in real time according to the variation trend.
Optionally, in this embodiment of the present invention, after the step of determining whether the fourth TA based on the DMRS measurement is valid, the method includes:
if the fourth TA is valid, carrying the fourth TA in a third TA command, and sending the third TA command to the terminal;
and if the fourth TA is invalid, carrying the target TA in a fourth TA command, and issuing the fourth TA command to the terminal.
And if the fourth TA is valid, taking the fourth TA as a target TA, carrying the fourth TA in a third TA command, and issuing the third TA command to the terminal. If the fourth TA is invalid, the original target TA is still issued to the terminal, and step 206 is continuously executed after the issuance period of the next TA command is reached.
Optionally, in this embodiment of the present invention, the step of determining an issuing period of the TA command includes:
measuring a frequency offset value based on the DMRS;
and determining the issuing period of the TA command according to the frequency deviation value and the preset central frequency point of the network side equipment.
The issuing period of the TA command is determined according to the following formula:
T＝T0*F/f0
t represents a TA command issuing period, T0 represents a preset minimum TA command adjustment period, F represents a frequency value of a preset center frequency point, and F0 represents a frequency offset value.
In the prior art, if the period for adjusting the uplink synchronization position of the UE (i.e. the issuing period of the TA command) is too short, ping-pong UE adjustment delay is caused, downlink scheduling resources are wasted, and the probability of uplink synchronization position tuning is increased; if the period for adjusting the uplink synchronization position of the UE is too long, the uplink synchronization position of the UE is not ideal, which affects the uplink demodulation performance, and the synchronization position of the high-speed mobile user deviates beyond the guard interval. In the embodiment of the invention, the frequency deviation value of the user level is measured based on the DMRS of the physical layer to dynamically and adaptively adjust the issuing period of the TA command, thereby avoiding the downlink scheduling resource waste caused by frequently adjusting the TA by the network side, issuing the TA command in real time, reducing the TA modulated risk, enabling the uplink synchronization to be in an ideal position, further improving the uplink demodulation performance and the whole uplink throughput.
The uplink synchronization adjusting method provided by the embodiment of the present invention is described above, and the uplink synchronization adjusting apparatus provided by the embodiment of the present invention will be described below with reference to the accompanying drawings.
Referring to fig. 3, an embodiment of the present invention further provides an uplink synchronization adjustment apparatus, which is applied to a base station, and the apparatus includes:
a parameter obtaining module 301, configured to obtain a channel sounding reference signal SRS and a demodulation reference signal DMRS of a terminal.
The SRS is an uplink reference signal, and is sent to network side equipment by the UE and used for the network side equipment to schedule network resources for the UE as reference; in a wireless communication network, a network side device generally allocates a partial region of a system bandwidth to a specific UE, and allocates a specific frequency region resource to the UE within a specific time.
The SRS is positioned at the last SC-FDMA symbol of a subframe, the periodic transmission is irrelevant to uplink data transmission, and the network side detects the time alignment state of the UE through the SRS besides being used as a scheduling reference because the SRS is periodically reported.
DMRS exists in PUSCH and PUCCH, and is used for a network device to evaluate an uplink channel from the same frequency location.
The method comprises the steps that when UE is accessed or switched to a cell covered by the UE, network side equipment acquires an SRS and a DMRS of the UE.
A TA measurement module 302 configured to measure a first timing advance, TA, based on the SRS and a second TA based on the DMRS.
The network side equipment obtains the SRS and the DMRS of the UE, measures a first TA based on the SRS, and measures a second TA based on the DMRS.
Specifically, the TA is used for UE uplink transmission, and in order to send an uplink data packet of the UE to the network side device at a preset time, a radio frequency transmission delay caused by a distance is estimated to send out the data packet at a corresponding time in advance.
In order to improve the measurement accuracy of the TAs, the network side device obtains two TAs based on SRS and DMRS measurements, respectively. DMRS is placed in the fourth block in every 0.5 msec slot, with two DMRS in one subframe; the SRS is placed in the last block of one subframe, the network side determines the arrival time of the SRS and the DMRS respectively based on the positions of the SRS and the DMRS, and then determines the corresponding TA respectively according to the time difference between the respective arrival time and the transmission time of the last downlink subframe.
A TA determining module 303, configured to determine a target TA based on the first TA and the second TA if the first TA and the second TA are the same and are both valid TAs.
For the UE, even if the measured source parameters (i.e., DMRS or SRS) are different, the TA of the same subframe is theoretically the same, and a certain deviation is inevitably present in the actual measurement process; therefore, in the embodiment of the present invention, the TAs are measured based on the two source parameters, and then the final target TA is determined based on the two measured TAs.
Specifically, for the same subframe, if the first TA and the second TA are in the same direction and both are valid TAs, the TA may be determined to be the target TA; the effective TA is that the received signal power of the source parameter of the TA is greater than a preset power threshold, and the signal-to-noise ratio of the received signal of the source parameter is greater than a preset signal-to-noise ratio threshold; the source parameter is SRS or DMRS. For example, for the first TA, if the SRS has a received signal power higher than a preset power threshold of the SRS and a signal-to-noise ratio greater than a preset signal-to-noise ratio threshold of the SRS, the first TA is determined to be a valid TA.
The first TA and the second TA are in the same direction, namely the offset directions (or time advance or time delay) of the first TA and the second TA are the same; in addition, if the two values are different, the target TA may be determined by taking an average value.
A TA issuing module 304, configured to carry the target TA in a first TA command, and issue the first TA command to the terminal.
The network side equipment informs the UE of the time of timing advance by sending the TAC to the UE; therefore, the network side device carries the target TA in a first TA command, and issues the first TA command to the terminal.
Optionally, in an embodiment of the present invention, the apparatus further includes:
the period determining module is used for determining the issuing period of the TA command;
a first determining module, configured to determine whether a third TA measured based on the SRS is valid if the current time is within the delivery period or a direction of a first preset number of consecutive times of the third TA is the same:
a first sending module, configured to carry the third TA in a second TA command and send the second TA command to the terminal if the third TA is valid;
and a second determining module, configured to determine whether a fourth TA measured based on the DMRS is valid if the third TA is invalid.
Optionally, in an embodiment of the present invention, the apparatus includes:
a second issuing module, configured to, after the second determining module determines whether a fourth TA based on the DMRS measurement is valid,
if the fourth TA is valid, carrying the fourth TA in a third TA command, and sending the third TA command to the terminal;
and if the fourth TA is invalid, carrying the target TA in a fourth TA command, and issuing the fourth TA command to the terminal.
Optionally, in this embodiment of the present invention, the period determining module includes:
a measurement sub-module to measure a frequency offset value based on the DMRS;
and the determining submodule is used for determining the issuing period of the TA command according to the frequency deviation value and the preset central frequency point of the network side equipment.
Optionally, in this embodiment of the present invention, the valid TA is that the received signal power of the source parameter of the TA is greater than a preset power threshold, and the signal-to-noise ratio of the received signal of the source parameter is greater than a preset signal-to-noise ratio threshold;
the source parameter is SRS or DMRS.
Optionally, in this embodiment of the present invention, the parameter obtaining module 301 is configured to:
and when detecting that the terminal is accessed to the cell of the network side equipment, acquiring a channel Sounding Reference Signal (SRS) and a demodulation reference signal (DMRS) of the terminal.
The uplink synchronization adjustment apparatus provided in the embodiment of the present invention can implement each process implemented by the network side device in the method embodiments of fig. 1 to fig. 2, and is not described here again to avoid repetition.
In the embodiment of the present invention, a parameter obtaining module 301 obtains a channel sounding reference signal SRS and a demodulation reference signal DMRS of a terminal; the TA measurement module 302 measures a first amount, TA, based on the SRS and a second amount, TA, based on the DMRS; if the first TA and the second TA are in the same direction and are both valid TAs, the TA determining module 303 determines a target TA based on the first TA and the second TA; the TA issuing module 304 carries the target TA in a first TA command, and issues the first TA command to the terminal; TA is measured based on SRS and DMRS, TA measurement precision is improved, uplink synchronization is quickly adjusted, and uplink data arrival time consistency is improved. The embodiment of the invention solves the problem that the measurement error is larger when the network side measures TA through the PRACH in the prior art.
On the other hand, an embodiment of the present invention further provides an electronic device, which includes a memory, a processor, a bus, and a computer program that is stored in the memory and is executable on the processor, where the processor implements the steps in the uplink synchronization adjustment method when executing the program.
For example, fig. 4 shows a schematic physical structure diagram of an electronic device.
As shown in fig. 4, the electronic device may include: a processor (processor)410, a communication Interface 420, a memory (memory)430 and a communication bus 440, wherein the processor 410, the communication Interface 420 and the memory 430 are communicated with each other via the communication bus 440. The processor 410 may call logic instructions in the memory 430 to perform the following method:
acquiring a channel Sounding Reference Signal (SRS) and a demodulation reference signal (DMRS) of a terminal;
measuring a first Timing Advance (TA) based on the SRS and a second TA based on the DMRS;
if the first TA and the second TA are in the same direction and are both valid TAs, determining a target TA based on the first TA and the second TA;
and carrying the target TA in a first TA command, and sending the first TA command to the terminal.
In addition, the logic instructions in the memory 430 may be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, an embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program is implemented to perform the uplink synchronization adjustment method provided in the foregoing embodiments, for example, the method includes:
acquiring a channel Sounding Reference Signal (SRS) and a demodulation reference signal (DMRS) of a terminal;
measuring a first Timing Advance (TA) based on the SRS and a second TA based on the DMRS;
if the first TA and the second TA are in the same direction and are both valid TAs, determining a target TA based on the first TA and the second TA;
and carrying the target TA in a first TA command, and sending the first TA command to the terminal.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (12)

1. An uplink synchronization adjustment method is applied to a network side device, and is characterized in that the method comprises the following steps:
acquiring a channel Sounding Reference Signal (SRS) and a demodulation reference signal (DMRS) of a terminal;
measuring a first Timing Advance (TA) based on the SRS and a second TA based on the DMRS;
if the first TA and the second TA are in the same direction and are both valid TAs, determining a target TA based on the first TA and the second TA;
carrying the target TA in a first TA command, and issuing the first TA command to the terminal;
measuring a frequency offset value based on the DMRS;
and determining the issuing period of the TA command according to the frequency deviation value and the preset central frequency point of the network side equipment, and issuing a subsequent TA command according to the issuing period.
2. The uplink synchronization adjustment method according to claim 1, wherein after determining an issuing period of the TA command and issuing a subsequent TA command according to the issuing period, the method comprises: if the current time is in the issuing period or the direction of a third TA continuous first preset number of times measured based on the SRS is the same, judging whether the third TA is effective:
if the third TA is valid, carrying the third TA in a second TA command, and sending the second TA command to the terminal;
and if the third TA is invalid, judging whether a fourth TA based on the DMRS measurement is valid.
3. The uplink synchronization adjustment method according to claim 2, wherein after the step of determining whether the fourth TA based on the DMRS measurement is valid, the method comprises:
if the fourth TA is valid, carrying the fourth TA in a third TA command, and sending the third TA command to the terminal;
and if the fourth TA is invalid, carrying the target TA in a fourth TA command, and issuing the fourth TA command to the terminal.
4. The uplink synchronization adjustment method according to any one of claims 1 to 3, wherein the valid TA is that a received signal power of a source parameter of the TA is greater than a preset power threshold, and a signal-to-noise ratio of the received signal of the source parameter is greater than a preset signal-to-noise ratio threshold;
the source parameter is SRS or DMRS.
5. The uplink synchronization adjustment method according to claim 1, wherein the step of obtaining the channel Sounding Reference Signal (SRS) and the demodulation reference signal (DMRS) of the terminal includes:
and when detecting that the terminal is accessed to the cell of the network side equipment, acquiring a channel Sounding Reference Signal (SRS) and a demodulation reference signal (DMRS) of the terminal.
6. An uplink synchronization adjustment apparatus, applied to a network side device, the apparatus comprising:
the parameter acquisition module is used for acquiring a channel Sounding Reference Signal (SRS) and a demodulation reference signal (DMRS) of the terminal;
a TA measurement module to measure a first Timing Advance (TA) based on the SRS and a second TA based on the DMRS;
a TA determining module, configured to determine a target TA based on a first TA and a second TA if the first TA and the second TA are in the same direction and are both valid TAs;
the TA issuing module is used for carrying the target TA in a first TA command and issuing the first TA command to the terminal;
a measurement sub-module to measure a frequency offset value based on the DMRS;
and the determining submodule is used for determining the issuing period of the TA command according to the frequency deviation value and the preset central frequency point of the network side equipment and issuing a subsequent TA command according to the issuing period.
7. The uplink synchronization adjustment apparatus according to claim 6, further comprising:
a first determining module, configured to determine whether a third TA measured based on the SRS is valid if the current time is within the delivery period or a direction of a first preset number of consecutive times of the third TA is the same:
a first sending module, configured to carry the third TA in a second TA command and send the second TA command to the terminal if the third TA is valid;
and a second determining module, configured to determine whether a fourth TA measured based on the DMRS is valid if the third TA is invalid.
8. The uplink synchronization adjustment apparatus according to claim 7, wherein the apparatus comprises:
a second issuing module, configured to, after the second determining module determines whether a fourth TA based on the DMRS measurement is valid,
if the fourth TA is valid, carrying the fourth TA in a third TA command, and sending the third TA command to the terminal;
and if the fourth TA is invalid, carrying the target TA in a fourth TA command, and issuing the fourth TA command to the terminal.
9. The uplink synchronization adjusting apparatus according to any one of claims 6 to 8, wherein the effective TA is that a received signal power of a source parameter of the TA is greater than a preset power threshold, and a signal-to-noise ratio of the received signal of the source parameter is greater than a preset signal-to-noise ratio threshold;
the source parameter is SRS or DMRS.
10. The uplink synchronization adjusting apparatus according to claim 6, wherein the parameter obtaining module is configured to:
and when detecting that the terminal is accessed to the cell of the network side equipment, acquiring a channel Sounding Reference Signal (SRS) and a demodulation reference signal (DMRS) of the terminal.
11. An electronic device comprising a processor, a memory and a computer program stored on the memory and executable on the processor, characterized in that the computer program, when executed by the processor, implements the steps of the up-synchronization adjustment method according to any one of claims 1 to 5.
12. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the upstream synchronization adjustment method according to any one of claims 1 to 5.
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