CN113784431B - UE (user equipment) mobile timing advance optimization method based on 5GNR (global navigation network) - Google Patents
UE (user equipment) mobile timing advance optimization method based on 5GNR (global navigation network) Download PDFInfo
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Abstract
The invention discloses a UE (user equipment) mobile timing advance optimization method based on 5GNR (global navigation network), which comprises the following steps: a base station physical layer normally receives uplink data PUSCH DMRS or SRS signals; according to a PUSCH DMRS or SRS signal received by a physical layer of the base station, calculating nTa time delay values by using a physical layer algorithm; judging nTa time delay value according to preset reporting condition, if meeting the reporting condition, the base station physical layer reports TA0 to L2; l2 calculates the TA value of the time delay needed by UE according to the TA0 reported, and issues the TA value to UE through PDSCH, and UE adjusts the advance of the uplink signal according to the TA value. The invention avoids that the receiving signal of the base station side can be received in advance because the UE moves towards the base station after accessing, and the OFDM data signal can be intercepted when the CP of the time domain signal is removed, thereby reducing the interference problem of the uplink data ISI.
Description
Technical Field
The invention relates to the field of 5G network communication, in particular to a UE (user equipment) mobile timing advance optimization method based on 5GNR (global navigation network).
Background
5G mobile networks like earlier 2G, 3G and 4G mobile networks, 5G networks are digital cellular networks in which the service area covered by a provider is divided into a number of small geographical areas called cells. Analog signals representing sound and images are digitized in the handset, converted by an analog-to-digital converter and transmitted as a bit stream. As with existing handsets, when a user passes from one cell to another, their mobile device will automatically "switch" to the antenna in the new cell.
The main advantage of 5G networks is that the data transmission rate is much higher than previous cellular networks, up to 10Gbit/s, faster than current wired internet, 100 times faster than previous 4G LTE cellular networks. Another advantage is lower network delay (faster response time), below 1 millisecond, and 30-70 milliseconds for 4G. Due to faster data transmission, the 5G network will not only serve the handset, but will also become a general home and office network provider, competing with the cable network provider. Previous cellular networks provided low data rate internet access suitable for cell phones, but a cell phone tower could not economically provide sufficient bandwidth as a general internet provider for home computers.
In this application context, after the UE is powered on and completes downlink synchronization and then uplink synchronization through the SSB and SIB 1. The UE accesses to the cell and can perform interactive processing of data service with the base station.
For such a provision in the NR-5G protocol, the base station needs to periodically send ta (time advance) to the UE for adjusting the uplink arrival time of the UE, so that uplink signals sent by unused UEs can arrive at the base station at the same time.
TA is divided into two types, one type is that after the base station processes a Prach signal during random access, the Prach signal is sent to UE through Msg2 RAR to carry out adjustment of absolute quantity for one time; one is that after the UE accesses the cell (when the UE accesses non-randomly), the physical layer of the base station calculates the relative time delay Tc generated by the UE during the movement through the reference signal DMRS/SRS, converts Tc into TA, and sends the TA to the UE through the MAC CE packet for TA adjustment.
The format of the second TA in the MAC CE and the meaning of the TA values are specified in 3GPP protocols 38.3216.1.3.4 and 38.2134.2. The TA is represented by 6 bits in the MAC CE and ranges from 0 to 63. Since the UE may be far from the base station or close to the base station during the moving process, there will be positive or negative values in the relative distance, and the notification in the protocol is bounded by 31, refer to the formula:
if TA >31 indicates that the distance between the UE and the base station is increasing, the UE needs to transmit a signal in advance. If TA <31, the distance between the UE and the base station decreases, and the UE needs to delay transmission of a signal.
The patent CN105493584A by hua shi technology limited discloses a method for adjusting transmission timing, which introduces TA calculation to optimize the quantization value, but does not consider that when the UE moves, if the relative UE delay measured by the physical layer of the base station is negative and greater than-32 Tc (-8 Ts), the base station cannot notify the UE of the advance adjustment amount by issuing TA =30 (because 1TA is equal to 32 Tc). When the UE moves to the base station and the distance is continuously reduced, time domain data received by the base station side may arrive in advance, so that when the base station processes uplink data, a part of the OFDM signal may be cut off after CP segment data is cut off, resulting in ISI (inter-symbol interference).
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a UE movement timing advance optimization method based on 5GNR, which avoids the problems that the UE moves towards the direction of a base station after being accessed, the received signal of the base station side can be received in advance, and when the CP of a time domain signal is removed, the OFDM data signal can be intercepted, and the interference of uplink data ISI is reduced.
The purpose of the invention is realized by the following technical scheme:
the UE moving timing advance optimizing method based on the 5GNR comprises the following steps:
the method comprises the following steps: a base station physical layer normally receives uplink data PUSCH DMRS or SRS signals;
step two: according to a PUSCH DMRS or SRS signal received by a physical layer of the base station, calculating nTa time delay values by using a physical layer algorithm;
step three: judging nTa time delay value according to preset reporting condition, if meeting the reporting condition, the base station physical layer reports TA0 to L2;
step four: l2 calculates the TA value of the time delay needed by UE according to the TA0 reported, and issues the TA value to UE through PDSCH, and UE adjusts the advance of the uplink signal according to the TA value.
Specifically, the second step specifically comprises: and according to the PUSCH DMRS or SRS signal received by the physical layer of the base station, estimating an arrival time delay value nTa from the UE to the base station by using a physical layer algorithm through the characteristics of the PUSCH DMRS/SRS, wherein the unit of nTa represents the time interval of one sampling point.
Specifically, the second step further comprises: and if the UE does not move after accessing the cell, nTa = 0.
Specifically, the third step specifically comprises: judging the nTa time delay value, if nTa is negative and nTa > -32 × n, the physical layer of the base station directly reports that L2 is TA0= -32 × n; wherein n is an integer; otherwise nTa is the real time delay value, the base station physical layer reports the real time delay value nTa to the MAC layer.
Specifically, the fourth step specifically includes: the MAC layer receives nTa reported by the physical layer, calculates that the UE needs to delay 2 TAs, performs MAC CE group package, and sends the packet to the UE through the downlink PDSCH of the physical layer, and the UE performs the lead adjustment of the uplink signal.
The process that the L2 calculates the TA value of the delay time required by the UE according to the reported TA0 in step four specifically includes: based on received pilot signal and local DMRS sequencePerforming LS channel estimation to obtain channel response value
Estimating channel response values using a common algorithm
Wherein K is the sub-carrier index of DMRS, K is the number of DMRS sub-carriers of PUSCH, R is the total number of receiving antennas, R is the antenna index,
as an intermediate variable, for obtaining the sum of products of adjacent subcarriers in the DMRS data for the r-th number of antennas, nTa is calculated:
wherein angle represents the calculated angleN fft The number of FFT points is 4096 in a 5G 30kHz subcarrier system, L is the two subcarrier length of DMRS interval 1 subcarrier, L = 4; pi is the circumference ratio, and the value is 3.14159.
In the invention, the UE mobile timing advance optimization process comprises the following steps:
(1) a value for the delay (in Tc, also corresponding to a sampling interval value) nTa is calculated from the PUSCH DMRS or SRS signal, reflecting the relative delay of the UE signal received by the current cell. And if the UE does not move after accessing the cell, nTa = 0.
Wherein,
(2) if nTa is negative and nTa > -32 x n, then it is reported directly to L2 as TA0= -32 x n, where n is an integer. Example (c): if nTa = -60, then n is 2, and it reports that L2 is nTa = -64
(3) After receiving TA0 reported by the physical layer, L2 calculates to obtain that the UE needs to delay 1TA, and fills 30 the MCE 6bit value of the TA and sends it to the UE through PDSCH, so that the UE performs the advance adjustment of the uplink signal.
The invention has the beneficial effects that:
the invention can inform the UE to delay the sending of the uplink signal when the UE moves towards the base station, so that the UE signal reaches the base station, the physical layer of the base station can not influence the loss of the data segment of the OFDM symbol when removing CP segment data, thereby reducing ISI interference.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention.
Fig. 2 is a schematic diagram of the carrier length of the parameter L according to the present invention.
FIG. 3 is a TA Command structure diagram of the present invention.
Detailed Description
In order to clearly understand the technical features, objects and effects of the present invention, 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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
In the invention, a Chinese expression corresponding to Chinese and English technical nouns in the technical scheme is provided, which specifically comprises the following steps: pusch (physical uplink shared channel) -physical layer uplink shared channel;
srs (sounding reference signal sounding) -reference signal;
dmrs (demodulation reference signal) -demodulation reference signal;
PUSCH DMRS (Demodulation reference signal for PUSCH) -PUSCH Demodulation reference signal;
TA （Timing Advance）；
nTa-experimental values estimated with PUSCH DMRS, in Tc, where Tc = 1/(4096 × 300000) s;
RAR (random Access response) -random Access response
MAC CE (MAC Control Elements) -MAC Control element.
For such a provision in the NR-5G protocol, the base station needs to periodically send ta (time advance) to the UE for adjusting the uplink arrival time of the UE, so that uplink signals sent by unused UEs can arrive at the base station at the same time.
TA is divided into two types, one type is that after the base station processes a Prach signal during random access, the Prach signal is sent to UE through Msg2 RAR to carry out adjustment of absolute quantity for one time; one is that after the UE accesses the cell (when the UE accesses non-randomly), the physical layer of the base station calculates the relative time delay Tc generated by the UE during the movement through the reference signal DMRS/SRS, converts Tc into TA, and sends the TA to the UE through the MAC CE packet for TA adjustment. After the UE is accessed, the UE moves towards the base station, and the received signal at the base station side is received in advance, and when the CP of the time domain signal is removed, the OFDM data signal is intercepted, which causes the problem of ISI interference of uplink data.
Aiming at the problems, the invention provides a UE mobile timing advance optimization method based on 5GNR, which is characterized in that uplink data PUSCH DMRS or SRS signals are normally received through a base station physical layer, and nTa time delay values are calculated by utilizing a physical layer algorithm according to the PUSCH DMRS or SRS signals received by the base station physical layer. And then, the nTa time delay value is judged according to the preset reporting condition, and if the reporting condition is met, the base station physical layer reports TA0 to L2. And finally, the L2 calculates the TA value of the time delay required by the UE according to the reported TA0, and transmits the TA value to the UE through the PDSCH, and the UE adjusts the advance of the uplink signal according to the TA value.
The specific implementation flow of the method of the invention is as follows:
the first embodiment is as follows:
in this embodiment, as shown in fig. 1, a method for optimizing a UE mobile timing advance based on 5GNR includes the following steps:
the method comprises the following steps: a base station physical layer normally receives uplink data PUSCH DMRS or SRS signals;
step two: according to a PUSCH DMRS or SRS signal received by a physical layer of the base station, calculating nTa time delay values by using a physical layer algorithm;
step three: judging nTa time delay value according to preset reporting condition, if meeting the reporting condition, the base station physical layer reports TA0 to L2;
step four: l2 calculates the TA value of the time delay needed by UE according to the TA0 reported, and issues the TA value to UE through PDSCH, and UE adjusts the advance of the uplink signal according to the TA value.
Specifically, the second step specifically comprises: and according to the PUSCH DMRS or SRS signal received by the physical layer of the base station, estimating an arrival time delay value nTa from the UE to the base station by using a physical layer algorithm through the characteristics of the PUSCH DMRS/SRS, wherein the unit of nTa represents the time interval of one sampling point.
In this embodiment, step two further includes: and if the UE does not move after accessing the cell, nTa = 0.
In this embodiment, the third step specifically includes: judging the nTa time delay value, if nTa is negative and nTa > -32 × n, the physical layer of the base station directly reports that L2 is TA0= -32 × n; wherein n is an integer; otherwise nTa is the real time delay value, the base station physical layer reports the real time delay value nTa to the MAC layer. Where L2 denotes the MAC layer.
Further, according to the nTa delay value judgment process in fig. 1, nTa = -32 × n is reported, where n is the smallest positive integer that meets the judgment condition. Specifically, the method comprises the following steps:
if nTa is a positive number, i.e. nTa >0, it is assumed that the trial nTa = 40Tc calculated by the physical layer received by the MAC is 32Tc unit because the TA unit is 32Tc unit, then the MAC advances the UE by 32Tc, i.e. TA =32, (31 denotes no advance or delay, 32-31 =1 denotes advance 1, i.e. 32 Tc), the UE data still has 8Tc delay to reach the base station, but because of CP (cyclic prefix) protection, the data is not interfered and ISI interference is not generated. (Inter Symbol Interference, ISI).
If nTa is a negative number, for example, nTa = -50, since 1TA =32Tc, the MAC delays the UE by 32Tc, i.e., TA =30, (30 indicates no advance or delay, 30-31 = -1, -1 indicates delay by 1, i.e., 32 Tc), and then the UE only delays by 32Tc on the original basis, and then 18Tc arrives at the base station in advance, which interferes with data and causes ISI interference.
And if nTa =32Tc × 2 is reported to the MAC at this time, the TA command sent by the MAC is 28 (28-31 = -2, -2 represents 2 delayed, i.e. 64 Tc), the UE data arrives at the base station after 14Tc, and at this time, because of CP (cyclic prefix) protection, the data is not interfered and ISI interference is not generated.
In this embodiment, the fourth step specifically includes: the MAC layer receives nTa reported by the physical layer, calculates that the UE needs to delay 1TA, performs MAC CE group package, and sends the MAC CE group package to the UE through the downlink PDSCH of the physical layer, and the UE performs the lead adjustment of the uplink signal.
In this embodiment, the process of calculating, by the L2 in step four, the TA value of the delay required by the UE according to the reported TA0 specifically includes: performing LS channel estimation according to the received pilot signal and the local DMRS sequence to obtain a channel response value
Estimating channel response values using a common algorithm
Wherein K is the sub-carrier index of DMRS, K is the number of DMRS sub-carriers of PUSCH, R is the total number of receiving antennas, R is the antenna index,
as an intermediate variable, adjacent sub-elements in DMRS data for obtaining the r-th antenna numberThe sum of the carrier products, nTa is calculated:
wherein angle represents the calculated angleN fft The number of FFT points is 4096 in a 5G 30kHz subcarrier system, L is the two subcarrier length of DMRS interval 1 subcarrier, L = 4; pi is the circumference ratio, and the value is 3.14159.
Example two:
in this embodiment, on the basis of the method steps provided in the first embodiment, the UE mobile timing advance optimization procedure includes:
(1) a value for the delay (in Tc, also corresponding to a sampling interval value) nTa is calculated from the PUSCH DMRS or SRS signal, reflecting the relative delay of the UE signal received by the current cell.
(2) The calculated delay value nTa is negative nTa > -32 n, and is reported to L2 as TA0= -32 n, where n is an integer. Example (c): if nTa = -60, then n is 2, and it reports that L2 is nTa = -64
(3) After receiving TA0 reported by the physical layer, L2 obtains, through calculation, that the UE needs to delay 2 TAs, and fills 30 the MCE 6bit value of the TA, and issues the value to the UE through the PDSCH, so that the UE performs the advance adjustment of the uplink signal.
The adjustment process of the advance specifically includes: the UE performs advanced or delayed data transmission according to a TA Command issued by the base station MAC, where the TA Command is composed of the structure shown in fig. 3, 1TA =32Tc, and Oct1 represents 18 bit or 1 Byte.
Example three:
in this embodiment, another specific situation of the method in the first embodiment when the delay value is determined is disclosed, and the specific advance adjustment implementation steps are as follows:
1. after the UE is accessed to a cell, the physical layer of the base station normally processes PUSCH data/SRS data, and estimates nTa the time difference reaching the base station from the UE by using a physical layer algorithm according to the characteristics of the PUSCH-DMRS/SRS, wherein the unit of nTa represents the time interval of one sampling point;
2. the physical layer further calculates nTa value of reporting to the MAC according to the UE time delay calculated by the DMRS, and if the calculated current time delay value nTa is negative and less than-32 x n, the nTa value of reporting to the MAC is the real time delay value;
3. the MAC layer receives nTa reported by the physical layer, performs MAC CE group package, and sends the MAC CE group package to the UE through a downlink PDSCH of the physical layer;
4. and the UE adjusts the lead of the uplink signal after receiving the transmitted information.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. The UE moving timing advance optimizing method based on 5GNR is characterized by comprising the following steps:
the method comprises the following steps: a base station physical layer normally receives uplink data PUSCH DMRS or SRS signals;
step two: according to a PUSCH DMRS or SRS signal received by a physical layer of the base station, calculating nTa time delay values by using a physical layer algorithm;
step three: judging nTa time delay value according to preset reporting condition, if meeting the reporting condition, the base station physical layer reports TA0 to L2;
the third step specifically comprises: judging the nTa time delay value, if nTa is negative and nTa > -32 × n, the physical layer of the base station directly reports that L2 is TA0= -32 × n; wherein n is an integer; otherwise nTa is the real time delay value, the base station physical layer reports the real time delay value nTa to the MAC layer;
step four: l2 calculates the TA value of the time delay needed by the UE according to the reported TA0, and issues the TA value to the UE through PDSCH, and the UE adjusts the lead amount of the uplink signal according to the TA value;
the fourth step specifically comprises: the MAC layer receives nTa reported by the physical layer, calculates to obtain that the UE needs to delay 2 TAs, performs MAC CE packet, and transmits the MAC CE packet to the UE through a downlink PDSCH of the physical layer, and the UE performs the lead adjustment of uplink signals;
the process that the L2 calculates the TA value of the delay required by the UE according to the reported TA0 specifically includes: performing LS channel estimation according to the received pilot signal and the local DMRS sequence to obtain a channel response value
Estimating channel response values using a common algorithm
Wherein K is the sub-carrier index of DMRS, K is the number of DMRS sub-carriers of PUSCH, R is the total number of receiving antennas, R is the antenna index,
as an intermediate variable, for obtaining the sum of products of adjacent subcarriers in the DMRS data for the r-th number of antennas, nTa is calculated:
wherein angle represents the calculated angleN fft The number of FFT points is 4096 in a 5G 30kHz subcarrier system, L is the two subcarrier length of DMRS interval 1 subcarrier, L = 4; pi is the circumference ratio, and the value is 3.14159.
2. The method according to claim 1, wherein the second step specifically comprises:
and according to the PUSCH DMRS or SRS signal received by the physical layer of the base station, estimating an arrival time delay value nTa from the UE to the base station by using a physical layer algorithm through the characteristics of the PUSCH DMRS/SRS, wherein the unit of nTa represents the time interval of one sampling point.
3. The method of claim 1, wherein the step two further comprises: and if the UE does not move after accessing the cell, nTa = 0.
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