CN114449645A - Multi-expansion-unit small station timing advance adjustment method - Google Patents
Multi-expansion-unit small station timing advance adjustment method Download PDFInfo
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- CN114449645A CN114449645A CN202210135899.2A CN202210135899A CN114449645A CN 114449645 A CN114449645 A CN 114449645A CN 202210135899 A CN202210135899 A CN 202210135899A CN 114449645 A CN114449645 A CN 114449645A
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Abstract
The invention discloses a multi-expansion-unit small-station timing advance adjusting method which is high in precision and efficiency. The adjusting method comprises the following steps: (10) TA related timer starts: the base station starts a TA timer and issues the TA value timer; (20) acquiring a time offset instantaneous value of a target user TA: carrying out preferential treatment on uplink signals sent by the UE and obtained by each extension unit, and calculating to obtain a time offset instantaneous value of a target user TA; (30) time-offset instantaneous sliding window storage: storing the time offset instantaneous value of the target user TA in a storage structure with the window length L moving forward along with the time, and recording the latest time offset instantaneous value; (40) issuing a TA value: when a TA value is issued, taking the mean value of the latest L time offset instantaneous values as a time offset effective value, and comparing the time offset effective value with a TA target adjustment value to obtain a TA value issued to a target user; (50) and sending successful feedback: and restarting the TA timer and the TA value issuing timer after receiving the successful issuing feedback.
Description
Technical Field
The invention belongs to the technical field of intelligent seals, and particularly relates to a multi-extension-unit small-station timing advance adjusting method.
Background
Timing Advance (TA) adjustment of a small station is to measure an uplink signal (such as SRS/DMRS/CQI/PUSCH/PRACH) sent by a UE by the small station, obtain a TA time offset instantaneous value after processing, and send a Timing Advance adjustment command (TAC) to the UE through an MAC CE control unit for adjustment. For advancing/delaying the uplink transmission time when the UE transmits uplink data to the base station (GNB). The process can compensate time delay or multipath effect, and the UE and the small station in a moving state can continuously keep uplink synchronization by adjusting the uplink time offset.
The topology of a small base station containing multiple Extension Units (EUs) is shown in fig. 1. For the same target user UE, each extension unit can respectively measure uplink signals (such as SRS/PUSCH/CQI and the like) of the target user UE to obtain a plurality of TA time offset instantaneous values, and a timing advance adjustment command TAC needs to send an optimal TA value.
However, the prior art has problems that: for a small base station including multiple extension units, the accuracy of timing advance adjustment is not high enough, and the efficiency is low.
Disclosure of Invention
The invention aims to provide a multi-expansion-unit small-station timing advance adjusting method which is high in precision and efficiency.
The technical solution for realizing the purpose of the invention is as follows:
a multi-expansion unit small station timing advance adjusting method comprises the following steps:
(10) TA related timer starts: the base station starts a TA timer and issues the TA value timer;
(20) acquiring a time offset instantaneous value of a target user TA: carrying out preferential treatment on uplink signals sent by the UE and obtained by each extension unit, and calculating to obtain a time offset instantaneous value of a target user TA;
(30) time-offset instantaneous sliding window storage: storing the time offset instantaneous value of the target user TA in a storage structure with a window length of L, wherein the window moves forwards along with time to record the latest time offset instantaneous value;
(40) issuing a TA value: when the timer for issuing the TA value is overtime, taking the mean value of the latest L time offset instantaneous values recorded in the window as a time offset effective value, comparing the time offset effective value with a TA target adjustment value to obtain an issued TA value, and issuing the issued TA value to a target user;
(50) and sending successful feedback: and restarting the TA timer and the TA value issuing timer after receiving the successful issuing feedback.
Compared with the prior art, the invention has the following remarkable advantages:
1. the adjustment precision is high: the method is based on a plurality of time offset instantaneous values obtained by the measurement of the small station multi-expansion unit, and determines the final time offset instantaneous value of the target user according to the uplink signal correlation peak measured by each expansion unit, and compared with the conventional exhaustion method and average value method, the method has higher adjustment precision; the TA time offset instantaneous value measured by the expansion unit is screened, so that the adjustment precision is further improved
2. The adjustment efficiency is high: according to the invention, the time offset instantaneous value measured by the multiple extension units is subjected to preferential treatment, so that redundant calculation is reduced, and the adjustment efficiency is improved.
The invention is described in further detail below with reference to the figures and the detailed description.
Drawings
Fig. 1 is a main flow chart of a method for adjusting the timing advance of a multi-extension-unit cell in advance according to the present invention.
Fig. 2 is a topological structure diagram of a small cell under a multi-extension unit.
Fig. 3 is a flowchart of the TA timer issuing step in fig. 1.
Fig. 4 is a flowchart of the steps for acquiring the time offset instantaneous value of the target user TA in fig. 1.
Detailed Description
As shown in fig. 1, the method for adjusting the timing advance of the multiple extension unit small station of the present invention is applicable to the multiple extension unit small station shown in fig. 2, and comprises the following steps:
(10) TA related timer starts: the base station starts a TA timer and issues the TA value timer;
as shown in fig. 3, the (10) TA related timer starting step includes:
(11) the TA timer starts: confirming that a configuration switch is turned on, and starting a TA timer by a base station when the UE completes the random access process;
(12) the timer for sending the TA value is started: and setting the time length of the TA value issuing timer to 1/3 of the time length of the TA timer, and starting the TA value issuing timer after the TA timer is started.
The TA timer is a timer for indicating TA uplink out-of-step, and the overtime of the timer represents that the uplink is out-of-step;
and the TA value issuing timer is used for controlling the time for issuing the TA value to the UE, and when the TA value issuing timer is overtime, the TA value issuing timer is operated for issuing the TA value to the UE.
For the TA value delivery timer, its duration is set to 1/3 of the TA timer duration to ensure that a valid TA value can be successfully delivered within the TA timer. The protocol specifies that the duration can be configured to be 500ms,750ms,1280ms,1920ms,2560ms,5120ms,10240 ms.
The TA uplink out-of-step timer duration is 1, the TA value is issued for the timer duration 2, and the duration 2 is generally set to 1/3 of the duration 1, so that the TA value can be successfully issued for 2-3 times to the UE before the uplink out-of-step.
(20) Acquiring a time offset instantaneous value of a target user TA: carrying out preferential treatment on uplink signals sent by the UE and obtained by each extension unit, and calculating to obtain a time offset instantaneous value of a target user TA;
the uplink signal sent by the UE comprises SRS, PUSCH, CQI and DMRS.
The step of (20) acquiring the time offset instantaneous value of the target user TA comprises the following steps:
(21) acquiring a time offset instantaneous value of a single extension unit TA: for a single expansion unit, one or two uplink signals sent by UE are selected, and TA time offset instantaneous values are obtained through calculation;
for the single extension unit, multiple uplink signals of the UE, including SRS, PUSCH, CQI, DMRS, can be acquired, a single uplink signal can be selected to measure and calculate a TA time offset instantaneous value, and multiple uplink signals can be multiplexed to measure and calculate a TA time offset instantaneous value.
And measuring and calculating the TA time offset instantaneous value by selecting one of SRS/PUSCH/CQI/DMRS.
Multiplexing multiple uplink signals, selecting two signals from SRS/PUSCH/CQI/DMRS, respectively measuring and calculating TA time offset instantaneous values, and performing weighted average on the respectively calculated TA time offset instantaneous values to serve as the final time offset instantaneous value.
(22) Acquiring a time offset instantaneous value of a multi-extension unit TA: under the multi-extension unit, a TA time offset instantaneous value is obtained by multiplexing and calculating a single uplink signal or a plurality of uplink signals;
in the multi-extension unit, the calculation of the TA time offset instantaneous value by using the single uplink signal specifically includes:
the multiple extension units respectively acquire the same uplink signal of the target UE, acquire the effective peak of the uplink signal of the target UE, and calculate the TA time offset instantaneous value of the target UE;
in the multi-extension unit, the TA time offset instantaneous value obtained by multiplexing and calculating various uplink signals is specifically:
each expansion unit respectively acquires various uplink signals of target UE, the effective peak of each uplink signal of the target UE is acquired for the same uplink signal, the TA time offset instantaneous value of each signal is calculated, and then the weighted mean value calculation is carried out on a plurality of TA time offset instantaneous values measured by various signals to obtain the TA time offset instantaneous value under the final multi-expansion unit.
The obtaining of the effective peak of the target UE uplink signal specifically includes:
case 1: the multiple extension units receive the signal of the same UE, if the UE is close to one extension unit, the peak value of the uplink signal received by the extension unit is strongest, and under the condition that the signal peak values of the other extension units are all weaker, the strongest peak value is taken as the effective peak of the uplink signal of the target UE.
Case 2: if the distance between the UE and the plurality of extended cells is not much, under the condition of a plurality of obtained strong signal peak values, the average value of the signal peaks of the extended cells with stronger signals can be taken as the effective peak of the uplink signal of the target UE.
Each Extension Unit (EU) has n uplink signal measurements within a timer period issued by the TA value, and can obtain n time offset instantaneous values. At the same time, a plurality of expansion units can receive the uplink signal, and can respectively measure and calculate a time offset instantaneous value, so that at the same time, x expansion units exist, and the base station can receive x time offset instantaneous values. Then, under the base station with x spreading units (EU), each spreading unit has n uplink signal measurements in one period (timer period for issuing TA value), and the conventional processing will obtain x × n instantaneous values of time offset.
If a plurality of expansion units receive a plurality of correlation peaks at a certain uplink moment, the correlation peaks of the uplink signals are processed firstly to obtain the effective peaks of the uplink signals of the target UE, so that only n times of measurement and calculation are needed in one period to obtain n time offset instantaneous values, compared with conventional processing, the redundancy calculation is reduced, and the efficiency is higher.
(30) Time-offset instantaneous sliding window storage: storing the time offset instantaneous value of the target user TA in a storage structure with a window length of L, wherein the window moves forwards along with time to record the latest time offset instantaneous value;
as an improvement, in the step (30) of storing the time offset instantaneous value sliding window, before storing the target user TA time offset instantaneous value in a storage structure with a window length L, the step of sieving the target user TA time offset instantaneous value is further included, that is:
(25) sieving the time-offset instantaneous value: and sieving the time offset instantaneous value of the target user TA according to a sieving rule which is as follows:
251) when the measured time offset instantaneous value floats at 5 points above and below the target adjustment value, the measured time offset instantaneous value is considered to be an effective time offset instantaneous value, and the time offset instantaneous value with the value of +/-5 of the standard adjustment value is recorded;
preferably, the target adjustment value is 31;
252) when the measured time offset instantaneous value is out of the range of the target adjusting value, screening out the time offset instantaneous value;
when the target adjustment value is 31, such as when the offset is greater than 36(31+5), or less than 26(31-5), the offset is filtered.
The abnormal time offset instantaneous value caused by multipath effect or calculation error can be reduced by filtering out the time offset instantaneous value outside 31 +/-5, and the adjustment precision can be improved.
(40) Issuing a TA value: when the timer for issuing the TA value is up, taking the mean value of the latest L time offset instantaneous values recorded in the window as a time offset effective value, comparing the time offset effective value with a TA target adjustment value to obtain an issued TA value, and issuing the issued TA value to a target user;
the TA value TAsendAnd issuing a timing advance adjustment command TAC period to a target user through an MAC CE control unit.
In the step of issuing the TA value (40), the time offset effective value is compared with the TA target adjustment value to obtain the issued TA value, which is specifically described in the following formula:
in the formula, TAsendIs a delivered TA value, TAeffectiveIs a time-offset effective value, TAtargetAdjust for TA target.
Considering the relative stability of the position of the small station access user, only one point is adjusted at most each time, thereby preventing uplink desynchronization caused by excessive adjustment of multipath effect, and biasing TA time to an effective value TAeffectiveAnd TA target adjustment value TAtargetMaking a comparison when TAeffectiveValue greater than TAtargetTA issued in the TAC commandsendIs 32; when TA iseffectiveValue less than TAtargetTA issued in the TAC commandsendIs 30. In order to improve the relative position stability of the small station access user, the timing advance TA of the small station is adjusted by at most one point each time, so that the uplink desynchronizing caused by excessive adjustment of multipath effect at one time is prevented. That is, the TA time offset value issued by the small station each time only adjusts one point at most, and the method of fine adjustment for many times is used to prevent the measurement error caused by the multipath effect, so that the uplink desynchronization caused by excessive adjustment for one time. The multiple fine adjustment method can effectively improve the adjustment precision.
(50) And sending successful feedback: and restarting the TA timer and the TA value issuing timer after receiving the successful issuing feedback.
Claims (7)
1. A multi-expansion unit small station timing advance adjusting method is characterized by comprising the following steps:
(10) TA related timer starts: the base station starts a TA timer and issues the TA value timer;
(20) acquiring a time offset instantaneous value of a target user TA: carrying out preferential treatment on uplink signals sent by the UE and obtained by each extension unit, and calculating to obtain a time offset instantaneous value of a target user TA;
(30) time-offset instantaneous sliding window storage: storing the time offset instantaneous value of the target user TA in a storage structure with a window length of L, wherein the window moves forwards along with time to record the latest time offset instantaneous value;
(40) issuing a TA value: when the timer for issuing the TA value is overtime, taking the mean value of the latest L time offset instantaneous values recorded in the window as a time offset effective value, comparing the time offset effective value with a TA target adjustment value to obtain an issued TA value, and issuing the issued TA value to a target user;
(50) and sending successful feedback: and restarting the TA timer and the TA value issuing timer after receiving the successful issuing feedback.
2. The method of claim 1, further comprising, prior to said step of (30) storing a time-offset window, the steps of:
(25) sieving the time-offset instantaneous value: and sieving the time offset instantaneous value of the target user TA according to a sieving rule to sieve the measurement time offset instantaneous value outside the range of the target adjustment value.
3. The method of claim 2, wherein the screening rules comprise:
251) when the measured time offset instantaneous value floats at 5 points above and below the target adjustment value, recording the time offset instantaneous value of which the value is +/-5 of the target adjustment value;
252) when the measured time offset instantaneous value is outside the target adjustment value range, the time offset instantaneous value is screened out.
4. The method of claim 3, wherein:
the target adjustment value is 31.
5. The method of any of claims 1 to 4, wherein the (10) TA related timer starting step comprises:
(11) the TA timer starts: confirming that a configuration switch is turned on, and the UE completes a random access process, and starting a TA timer by the base station; after feeding back and successfully issuing a TAC command issued by the MAC CE control unit, the base station restarts the TA timer;
(12) the timer for sending out the TA value is started: and setting the time length of the TA value issuing timer as 1/3 of the time length of the TA timer, and starting the TA value issuing timer.
6. The method of multi-expansion-unit cell timing advance adjustment according to one of claims 1 to 4, characterized by:
in the step of issuing the TA value (40), the time offset effective value is compared with the TA target adjustment value according to the following formula to obtain the issued TA value:
in the formula, TAsendIs a delivered TA value, TAeffectiveIs a time offset effective value, TAtargetAdjust for TA target.
7. The method of one of claims 1 to 4, wherein said step of (20) acquiring TA time offset instant of a target user comprises:
(21) acquiring a time offset instantaneous value of a single extension unit TA: for a single expansion unit, one or two uplink signals sent by UE are selected, and TA time offset instantaneous values are obtained through calculation;
(22) acquiring a time offset instantaneous value of a multi-extension unit TA: and under the multi-extension unit, a TA time offset instantaneous value is obtained by multiplexing and calculating a single uplink signal or a plurality of uplink signals.
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