CN112996038A - F1 time delay dynamic shunting method - Google Patents
F1 time delay dynamic shunting method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W28/00—Network traffic management; Network resource management
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Abstract
The invention discloses a dynamic shunting method for F1 time delay, belonging to the technical field of wireless communication. According to the dynamic shunting method of the F1 time delay, a time delay state report is constructed on a CU side, data volume feedback state reports are respectively constructed on DU sides of LTE and NR, F1 path time delays tLte and tNr of the LTE and NR are respectively calculated through the time delay state reports, and shunting is carried out by comparing the difference value of the time delays tLte and tNr with the data volume feedback state report. The dynamic shunting method of the F1 time delay is a more reasonable dynamic shunting algorithm, can well solve the problems of terminal flow reduction and even flow cutoff caused by poor F1 link, and has good popularization and application values.
Description
Technical Field
The invention relates to the technical field of wireless communication, and particularly provides a dynamic shunting method for F1 time delay.
Background
5G introduces independent networking (SA) and non-independent Networking (NSA), under the NSA networking, a terminal links two wireless access technologies of LTE and NR in a double mode, data distribution flow to LTE and NR needs to be considered, due to different time delays of the LTE and the NR, if the F1 link quality of the LTE is not good, the F1 time delay of the LTE is much larger than the F1 time delay of the NR, data is shunted to the LTE and the NR, the time delay of the LTE when the data is sent to the terminal is large, SN disorder of the PDCP is caused, the time of terminal reordering and the like is long, and the flow of the terminal is reduced and even cut off; if the link quality of the F1 link of the NR is not good, the F1 delay of the NR is much longer than that of the F1 link of the LTE, data are shunted to the LTE and the NR, the delay of the NR sent to the terminal is longer, the time for reordering the terminal and the like is longer, the flow of the terminal is reduced and even cut off, the SN numbers of the data sent by the LTE and the NR are received by the terminal and have local disorder, and if the shunting method is not reasonable, the flow received by the terminal is reduced and even the terminal is cut off.
Currently, each communication manufacturer has its own shunting method, and in a real test environment, if the quality of the F1 link is good and bad, the dynamic shunting method may produce an unsatisfactory effect, so that a mode capable of well solving the problem of poor shunting effect caused by the bad F1 link is urgently needed.
Disclosure of Invention
The technical task of the invention is to provide a more reasonable dynamic flow distribution algorithm aiming at the existing problems, and the dynamic flow distribution method of F1 time delay, which can well solve the problems of terminal flow reduction and even flow cutoff caused by poor F1 link.
In order to achieve the purpose, the invention provides the following technical scheme:
a time delay state report is constructed on a CU side of NR, data volume feedback state reports are respectively constructed on a DU side of RLC and NR of LTE, F1 path time delays tLte and tNr of the LTE and the NR are respectively calculated through the time delay state reports, and shunting is carried out by comparing the difference value of the time delays tLte and tNr with the data volume feedback state reports.
Preferably, a delay status report is constructed on the CU side, a current timestamp is written in the delay status report, the delay status report is sent to the RLC of the LTE in a fixed period through the F1 path, the delay status report is not processed by the LTE and is transferred back to the CU through the F1 path, and the CU receives the transferred delay status report to calculate the F1 path delay tLte of the LTE.
The fixed period can be set according to actual needs, and the fixed period in the invention is 5 ms.
Preferably, a delay status report is constructed at the CU side, a current timestamp is written in the delay status report, the delay status report is sent to the DU of the NR in a fixed period through the F1 path, the DU does not process the delay status report and is transferred back to the CU through the F1 path, and the CU receives the transferred delay status report and calculates the F1 path delay tNr of the NR.
The fixed period can be set according to actual needs, and the fixed period in the invention is 5 ms.
Preferably, comparing the difference value of the F1 path delay tLte of LTE and the F1 path delay tNr of NR, and if the difference value between tLte and tNr is greater than a threshold, the CU only sends data to the side with smaller delay; and if the difference value between the tLte and the t tNr is smaller than the threshold value, shunting according to the data volume feedback status report.
Preferably, the RLC of LTE calculates the size of data that can be transmitted in an air interface period, and constructs a data amount feedback status report on the RLC side of LTE to report to the NR CU.
Preferably, the DU of the NR calculates the size of data that can be sent in the air interface period, and constructs a data volume feedback status report on the DU side of the NR and reports the data volume feedback status report to the CU.
Preferably, the data volume that can be sent by the LTE and the NR is compared according to the data volume feedback status report, and if the data volume that can be sent by the LTE and the NR is greater than the data volume of the CU, the CU does not perform the splitting; if the data volume which can be sent by the LTE and the NR is smaller than that of the CU, the CU shunts to the NR and the LTE respectively; and if the data amount which can be transmitted by the LTE is smaller than that of the CU, the data amount which can be transmitted by the NR is larger than that of the CU, the CU transmits data to the NR, and if the data amount which can be transmitted by the NR is smaller than that of the CU, the data amount which can be transmitted by the LTE is larger than that of the CU, and the CU transmits data to the LTE.
Preferably, the CU does not perform the splitting if both the LTE and NR transmittable data amounts are larger than the data amount of the CU, the CU transmits data only to the NR if the NR arrives first at the CU, and the CU transmits data only to the LTE if the LTE arrives first at the CU.
Compared with the prior art, the F1 time delay dynamic shunting method has the following outstanding beneficial effects: the dynamic shunting method of the F1 time delay enables a dynamic shunting algorithm to be more reasonable by periodically counting the NR and the F1 time delay of the LTE, can well solve the problems of terminal flow reduction and even flow cutoff caused by poor F1 link, and has good popularization and application values.
Drawings
Fig. 1 is a flowchart of a dynamic shunting method for F1 delay according to the present invention.
Detailed Description
The dynamic shunting method of the F1 time delay of the present invention will be described in further detail with reference to the accompanying drawings and examples.
Examples
According to the F1 time delay dynamic shunting method, a time delay state report is constructed on the NR CU side, data volume feedback state reports are respectively constructed on the RLC and NR DU sides of LTE, F1 path time delays tLte and tNr of LTE and NR are respectively calculated through the time delay state reports, and shunting is carried out by comparing the difference value of the time delays tLte and tNr with the data volume feedback state reports.
And constructing a delay state report on the side of the CU of the NR, writing a current timestamp in the delay state report, sending the delay state report to a DU of the LTE in a fixed period of 5ms through an F1 path, not processing the delay state report by the DU, transferring the delay state report back to the CU through an F1 path, and calculating the F1 path delay tLte of the LTE by the CU after receiving the transferred delay state report. And constructing a delay state report at a CU side, writing a current timestamp in the delay state report, sending the delay state report to the DU of the NR within a fixed period of 5ms through an F1 path, not processing the delay state report by the DU, transferring the delay state report back to the CU through an F1 path, and calculating the F1 path delay tNr of the NR after the CU receives the returned delay state report.
Comparing the difference value of the F1 path delay tLte of LTE with the F1 path delay tNr of NR, and if the difference value between the tLte and tNr is greater than a threshold value, the CU only sends data to the side with the smaller delay; and if the difference value between the tLte and the t tNr is smaller than the threshold value, shunting according to the data volume feedback status report.
And when the difference between the tLte and the t tNr is smaller than the threshold, the DU of the LTE calculates the size of data which can be sent in an air interface period, and a data volume feedback state report is constructed on the RLC side of the LTE and is reported to the CU. And the DU of the NR calculates the size of data which can be sent in an air interface period, and a data volume feedback state report is constructed at the DU side of the NR and is reported to the CU. According to the data volume feedback state report, comparing the data volumes which can be sent by LTE and NR, and if the data volumes which can be sent by LTE and NR are both larger than the data volume of the CU, the CU does not shunt; if the data volume which can be sent by the LTE and the NR is smaller than that of the CU, the CU shunts to the NR and the LTE respectively; and if the data amount which can be transmitted by the LTE is smaller than that of the CU, the data amount which can be transmitted by the NR is larger than that of the CU, the CU transmits data to the NR, and if the data amount which can be transmitted by the NR is smaller than that of the CU, the data amount which can be transmitted by the LTE is larger than that of the CU, and the CU transmits data to the LTE.
And for the situation that the data volume which can be sent by the LTE and the NR is larger than that of the CU, the CU does not shunt, if the NR arrives at the CU first, the CU only sends data to the NR, and if the LTE arrives at the CU first, the CU only sends data to the LTE.
The specific implementation process of the dynamic offloading method for F1 latency of the present invention is shown in fig. 1, after a terminal accesses, an NR-PDCP bearer is established on the CU side, an LTE-RLC bearer is established in LTE, the NR-RLC bearer is established in the NR-DU, starts a timer, gets the current timestamp every 5ms period, then constructing a delay state report, respectively sending the delay state report to an LTE-RLC bearing and an NR-RLC bearing through an F1 path, receiving the delay state report sent by the NR-PDCP bearing by the LTE-RLC bearing, looping back to the NR-PDCP bearing through an F1 path without any processing, receiving the looped delay state report by the LTE-RLC bearing by the NR-PDCP bearing, analyzing the state report to obtain a timestamp, and calculating the F1 delay of the LTE by subtracting the timestamp of the state report from the current timestamp; the NR-RLC bearer receives the time delay state report sent by the NR-PDCP bearer, loops back to the NR-PDCP bearer through an F1 path without any processing, receives the time delay state report looped back by the NR-RLC bearer, analyzes the state report to obtain a time stamp, and calculates the F1 time delay of NR by subtracting the time stamp of the state report from the current time stamp.
And starting a timer after the LTE-RLC bearer is successfully established, calculating the LTE air interface sending data volume in the current period after the 5ms period is up, and then constructing a data volume FeedBack state report LTE-FeedBack to send to the NR-PDCP bearer.
And starting a timer after the NR-RLC bearer is successfully established, calculating the LTE air interface sending data volume in the current period after every 5ms period is reached, and then constructing a data volume FeedBack state report NR-FeedBack Back to send the data volume FeedBack state report NR-PDCP bearer.
Comparing the F1 time delay of NR with the F1 time delay of LTE in each period of NR-PDCP bearing, if the F1 of NR is larger than the F1 time delay of LTE, the F1 minus the F1 time delay of LTE is larger than a threshold value, and because the F1 time delay of NR is much larger than the F1 time delay of LTE, the NR-PDCP bearing only shunts towards LTE and does not shunt towards NR; if F1 of LTE is larger than F1 delay of NR, F1 delay of F1 minus NR of LTE is larger than a threshold value, and since F1 delay of LTE is much larger than F1 delay of NR, NR-PDCP bearer only shunts to NR and does not shunt to LTE.
The NR-PDCP carries out comparison between the F1 time delay of NR and the F1 time delay of LTE in each period, the difference between the F1 time delay of NR and the F1 time delay of LTE is smaller than a threshold value, which shows that the difference between the F1 time delay of NR and the F1 time delay of LTE is not large, the dynamic shunting in the current period does not depend on the F1 time delays of NR and LTE, and the dynamic shunting is mainly carried out according to the data volume feedback state report of NR and LTE.
The above-described embodiments are merely preferred embodiments of the present invention, and general changes and substitutions by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.
Claims (8)
1. A dynamic shunting method of F1 time delay is characterized in that: and constructing a time delay status report on the CU side of the NR, constructing data volume feedback status reports on the RLC side and the DU side of the NR of the LTE, calculating F1 path time delays tLte and tNr of the LTE and the NR respectively through the time delay status reports, and performing shunting by comparing the difference value of the time delays tLte and tNr with the data volume feedback status report.
2. The F1 time delay dynamic splitting method of claim 1, wherein: and constructing a time delay state report at a CU side, writing a current timestamp in the time delay state report, sending the time delay state report to RLC (radio link control) of the LTE in a fixed period through an F1 path, returning the time delay state report to the CU through an F1 path without processing the time delay state report by the LTE, and calculating F1 path time delay tLte of the LTE by the CU after receiving the returned time delay state report.
3. The F1 time delay dynamic splitting method of claim 2, wherein: and constructing a delay state report at a CU side, writing a current timestamp in the delay state report, sending the delay state report to an NR DU (data channel) in a fixed period through an F1 path, not processing the delay state report by the DU, transferring the delay state report back to the CU through an F1 path, and calculating the F1 path delay tNr of the NR after the CU receives the transferred delay state report.
4. The F1 time delay dynamic splitting method of claim 3, wherein: comparing the difference value of the F1 path delay tLte of LTE with the F1 path delay tNr of NR, and if the difference value between the tLte and tNr is greater than a threshold value, the CU only sends data to the side with the smaller delay; and if the difference value between the tLte and the t tNr is smaller than the threshold value, shunting according to the data volume feedback status report.
5. The F1 time delay dynamic splitting method of claim 4, wherein: the RLC of the LTE calculates the size of data which can be sent in an air interface period, and a data volume feedback state report is constructed on the RLC side of the LTE and reported to the CU of the NR.
6. The F1 time delay dynamic splitting method of claim 5, wherein: and the DU of the NR calculates the size of data which can be sent in an air interface period, and a data volume feedback state report is constructed at the DU side of the NR and is reported to the CU.
7. The F1 time delay dynamic splitting method of claim 6, wherein: according to the data volume feedback state report, comparing the data volumes which can be sent by LTE and NR, and if the data volumes which can be sent by LTE and NR are both larger than the data volume of the CU, the CU does not shunt; if the data volume which can be sent by the LTE and the NR is smaller than that of the CU, the CU shunts to the NR and the LTE respectively; and if the data amount which can be transmitted by the LTE is smaller than that of the CU, the data amount which can be transmitted by the NR is larger than that of the CU, the CU transmits data to the NR, and if the data amount which can be transmitted by the NR is smaller than that of the CU, the data amount which can be transmitted by the LTE is larger than that of the CU, and the CU transmits data to the LTE.
8. The F1 time delay dynamic splitting method of claim 7, wherein: if the data volume that LTE and NR can send is larger than that of CU, CU does not shunt, if NR comes to CU first, CU only sends data to NR, and if LTE comes to CU first, CU only sends data to LTE.
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Application publication date: 20210618 |