CN110366202B - Air interface link congestion feedback method, device and equipment and storage medium - Google Patents

Air interface link congestion feedback method, device and equipment and storage medium Download PDF

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Publication number
CN110366202B
CN110366202B CN201810251359.4A CN201810251359A CN110366202B CN 110366202 B CN110366202 B CN 110366202B CN 201810251359 A CN201810251359 A CN 201810251359A CN 110366202 B CN110366202 B CN 110366202B
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congestion
air interface
indication information
downlink
data
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CN110366202A (en
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王丽萍
谢峰
王明月
戚涛
何哲
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ZTE Corp
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ZTE Corp
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Priority to PCT/CN2019/079506 priority patent/WO2019184867A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/26—Flow control; Congestion control using explicit feedback to the source, e.g. choke packets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0289—Congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/08—Load balancing or load distribution
    • H04W28/082—Load balancing or load distribution among bearers or channels

Abstract

The invention discloses a congestion feedback method, a congestion feedback device, congestion feedback equipment and a computer-readable storage medium of an air interface link, wherein the method comprises the following steps: the DU carries out congestion detection on a downlink; if the congestion of the downlink is detected, generating congestion indication information; and reporting the congestion indication information to a CU so that the CU can adjust the link according to the congestion indication information. Under the condition of CU/DU separation, when a side link of a DU is congested, the CU side can rapidly change a shunting strategy or perform link switching according to congestion indication information reported by the DU, so that the data transmission efficiency is improved, and the technical requirements of 5G high-speed transmission, rapid switching and the like are met.

Description

Air interface link congestion feedback method, device and equipment and storage medium
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, and a device for feeding back congestion of an air interface link, and a computer-readable storage medium.
Background
In the 5G NR (New Radio) technology, a base station on the Radio access network side in a 5G network introduces an architecture in which CU-DUs (Centralized Unit-Distributed Unit) are separated, and one base station includes one CU and one or more DUs. As shown in fig. 1, from the perspective of the Protocol stack, the CU side includes an SDAP (Service Data Adaptation Protocol) layer and a PDCP (Packet Data Convergence Protocol) layer, and the DU side includes an RLC (Radio Link Control) layer, a MAC (Medium Access Control) layer and a PHY (Physical) layer. The interface between CU and DU is F1 interface. Under the dual-connection architecture, after Data arrives at the CU side from the core network, the Data can be split between two DUs through the F1 interface, and the CU realizes the flow control processing on the link through the flow control Status report DDDS (DL Data Delivery Status) that is fed back periodically or as needed at the DU side. The DDDS mainly includes a Data amount that the current DRB (Data Radio Bearer) of the DU and the UE (User Equipment/terminal) need to apply to the CU side, Data packet information that the F1 link detected at the DU side is lost, and Data packet information that the air interface of the DU side is successfully and continuously transmitted. Through the DDDS, the CU side can know the data demand of the DU side and perform corresponding data stream allocation, and can also know the data transmission situation of the F1 link to perform corresponding F1 data link switching or forwarding.
In the prior art, the time delay of a scheme for adjusting the shunting or link switching as congestion judgment is large, and technical requirements of 5G high-speed transmission, quick switching and the like are difficult to meet. Therefore, there is a need for a method to determine how to let a CU quickly determine whether a DU is congested in case of CU/DU separation, so as to adjust the link handling policy in time.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method, an apparatus, and a device for feeding back an air interface link congestion, and a computer-readable storage medium, so as to solve the problem that in the prior art, a time delay of a scheme for adjusting a flow distribution or a link switching as a congestion determination is large, and technical requirements of high-speed transmission and fast handover of 5G are difficult to meet.
The technical scheme adopted by the embodiment of the invention for solving the technical problems is as follows:
according to an aspect of an embodiment of the present invention, a method for feeding back congestion of an air interface link is provided, where the method includes:
the distribution unit DU carries out congestion detection on a downlink;
if the congestion of the downlink is detected, generating congestion indication information;
and reporting the congestion indication information to a centralized unit CU so that the CU can adjust a link according to the congestion indication information.
According to another aspect of the embodiments of the present invention, there is provided an air interface link congestion feedback apparatus, where the apparatus includes a DU and a CU;
the DU is used for carrying out congestion detection on a downlink; if the congestion of the downlink is detected, generating congestion indication information; reporting the congestion indication information to a CU;
the CU is used for acquiring congestion indication information reported by the DU; and adjusting the link according to the congestion indication information.
According to another aspect of the embodiments of the present invention, an air interface link congestion feedback device is provided, where the device includes: the congestion feedback method of the air interface link comprises a memory, a processor and an air interface link congestion feedback program which is stored on the memory and can be operated on the processor, wherein the steps of the congestion feedback method of the air interface link are realized when the congestion feedback program of the air interface link is executed by the processor.
According to another aspect of the embodiments of the present invention, a computer-readable storage medium is provided, where an air interface link congestion feedback program is stored on the computer-readable storage medium, and when executed by a processor, the step of the above air interface link congestion feedback method is implemented by the computer-readable storage medium.
According to the air interface link congestion feedback method, the air interface link congestion feedback device, the air interface link congestion feedback equipment and the computer-readable storage medium, under the condition that the CU/DU is separated, when a side link of the DU is congested, the CU side can rapidly change a shunt strategy or perform link switching according to congestion indication information reported by the DU, so that the data transmission efficiency is improved, and the technical requirements of 5G high-speed transmission, rapid switching and the like are met.
Drawings
Fig. 1 is a schematic diagram of a gbb internal user plane protocol stack structure;
FIG. 2 is a schematic diagram of a structure of data splitting between two DUs under the same CU;
FIG. 3 is a schematic diagram illustrating the structure of duplicate transmission of data between two DUs under the same CU;
FIG. 4 is a schematic diagram of the structure of NR-NR dual connectivity between different CUs;
FIG. 5 is a schematic diagram of the structure of LTE-NR dual connectivity between different CUs;
fig. 6 is a flowchart illustrating an air interface link congestion feedback method according to a first embodiment of the present invention;
fig. 7 is a schematic structural diagram of an air interface link congestion feedback apparatus according to a second embodiment of the present invention;
fig. 8 is a schematic diagram of a congestion processing time sequence for distributing data between two DUs in the same CU according to the embodiment of the present invention;
FIG. 9 is a schematic diagram illustrating a congestion handling timing structure of data transmission between two DUs under the same CU according to an embodiment of the present invention;
FIG. 10 is a schematic diagram illustrating an NR-NR dual connectivity congestion handling timing sequence between CUs according to an embodiment of the present invention;
fig. 11 is a schematic diagram of a time sequence structure of LTE-NR dual connectivity congestion handling between CUs according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of an air interface link congestion feedback device according to a third embodiment of the present invention.
The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
First embodiment
Prior to the explanation of the present embodiment, the existing solutions and the existing problems are explained in detail as follows:
as shown in fig. 2, in a scenario where data under the same CU is distributed between two DUs, after the data reaches the CU side, the CU makes a decision through a flow control algorithm and distributes the data between the two DUs in a certain ratio, and the UE receives and summarizes downlink data of the two DUs.
As shown in fig. 3, in a scenario where data is transmitted between two DUs under the same CU by duplication, after the data arrives at the CU side, the data is transmitted by duplication in the PDCP layer of the CU, that is, the same data is copied and simultaneously transmitted to the two DUs, and the UE receives the same data from the two DUs and performs duplicate packet reception processing.
As shown in fig. 4, in an NR-NR dual-connection scenario between CUs, after data arrives at a main base station, the main base station determines CU side by using a flow control algorithm, and distributes the data between two base stations through an Xn interface in a certain proportion, and a UE receives downlink data of the two base stations and summarizes the downlink data.
As shown in fig. 5, in an LTE-NR (4G5G) dual-connection scenario between CUs, after data arrives at a main base station, the CU side of the main base station makes a decision by a flow control algorithm, and distributes the data between two base stations through an Xn interface in a certain proportion, and a UE receives and summarizes downlink data of the two base stations respectively.
In the above listed application scenarios, the CU side can know the transmission condition of the DU air interface to some extent through the DDDS, and then determine whether the DU is congested through the flow control algorithm, so as to determine whether to change the corresponding offloading policy or perform link switching. However, the scheme of using the mechanism as congestion judgment to adjust the shunting or link switching has a large time delay, and is difficult to meet the technical requirements of 5G high-speed transmission, fast switching and the like.
Based on the problems existing in the existing solutions, as shown in fig. 6, a first embodiment of the present invention provides a method for feeding back congestion of an air interface link, where the method includes:
s11, DU performs congestion detection on the downlink.
In this embodiment, the DU performs congestion detection on the downlink based on the following information:
at least one of a CQI (Channel Quality Indicator) measurement report, SRS (Sounding Reference Signal) measurement, downlink buffer data transmission delay, RLC retransmission times, and HARQ (Hybrid Automatic Repeat reQuest) retransmission times measurement reported by a terminal.
S12, if the downlink congestion is detected, congestion indication information is generated.
In this embodiment, if downlink congestion is detected, the generating congestion indication information includes:
if the downlink congestion is detected, calculating a congestion SN (Sequence Number) and taking the congestion SN as congestion indication information, or setting the bearer level data application amount to zero and taking the bearer level data application amount set to zero as the congestion indication information. It should be noted that, in order to enable the CU to obtain the reported congestion indication information and perform link adjustment according to the congestion indication information, the bearer level data application amount may be set to zero for multiple times, and the number of times of setting the bearer level data application amount to zero is not limited herein.
In this embodiment, the congestion SN is calculated based on the following information:
at least one of data caching condition of the DU, status report information fed back by the user terminal, air interface link condition, HARQ information of the MAC, and ARQ (Automatic Repeat reQuest) information of the RLC.
In this embodiment, the calculating the congestion sequence number includes the steps of:
and calculating the sequence number of the largest data packet which can be currently processed by the DU, and taking the sequence number of the data packet as the congestion sequence number.
And S13, reporting the congestion indication information to a CU, so that the CU adjusts the link according to the congestion indication information.
In this embodiment, the DU reports the congestion indication information to the CU through the DDDS, and the CU performs link adjustment according to the congestion indication information after acquiring the congestion indication information reported by the DU.
To better illustrate the present embodiment, the following describes the application scenarios of the air interface link congestion feedback in fig. 2 to 5:
as shown in fig. 2, the congestion processing is distributed between two DUs for the same CU, the data is distributed between two intra-site DUs via two F1 interfaces in the CU, and the terminal receives the distributed downlink data via the two DUs and performs the reordering processing.
When detecting congestion of a downlink of DU1 through link detection, DU1 calculates information of a largest data packet which can be processed by current DU1, and takes SN of the data packet as congestion SN; the DDDS carries congestion SN and reports DU1 congestion to CUs via F1 interface. Or the DU1 sets the bearer level data application amount to zero in the DDDS, carries information that the bearer level data application amount is set to zero in the DDDS, and reports the congestion of the DU1 to the CU through the F1 interface.
The CU side knows that DU1 is congested, and suspends continuously sending downlink data to DU 1; meanwhile, the following packet is transmitted through the other side DU 2. The UE receives data through DU 2.
As shown in fig. 3, the same CU lower data is subjected to congestion transmission between two DUs, the CU lower data is subjected to congestion transmission between two intra-station DUs via two F1 interfaces, and the terminal receives the same lower data via two DUs and performs the duplicate packet processing.
When detecting congestion of a downlink of DU1 through link detection, DU1 calculates information of a largest data packet which can be processed by current DU1, and takes SN of the data packet as congestion SN; the DDDS carries congestion SN and reports DU1 congestion to CUs via F1 interface. Or the DU1 sets the bearer level data application amount to zero in the DDDS, carries information that the bearer level data application amount is set to zero in the DDDS, and reports the congestion of the DU1 to the CU through the F1 interface.
The CU side knows that the DU1 is congested, closes the duplicate function of the DU1 side and suspends the continuous transmission of the downlink duplicate data to the DU 1; the CU side continues sending downstream data through DU 2. The UE receives data through DU 2.
As shown in fig. 4, in the NR-NR dual-connection congestion processing between different CUs, data is divided between two NR base stations DU at the main CU1 through an Xn interface, and the terminal receives the divided downlink data from the two NR base stations through the dual connection and performs reordering processing.
When the auxiliary DU2 detects downlink congestion of DU2 through link detection, the information of the largest data packet which can be processed by the current DU2 is calculated, and the SN of the data packet is used as the congestion SN; congestion SN is carried in DDDS and DU2 congestion is reported to the main CU1 over Xn interface. Or the DU2 sets the bearer level data application amount to zero in the DDDS, carries information that the bearer level data application amount is set to zero in the DDDS, and reports the congestion of the DU2 to the main CU1 through the Xn interface.
The master CU1 side knows that the auxiliary DU2 is congested, and suspends the sending of downlink data to the auxiliary DU 2; meanwhile, the following packet is sent through the other side master DU 1. The UE receives data through the master DU 1.
As shown in fig. 5, in the LTE-NR dual-connection congestion processing between different CUs, data is shunted between the LTE base station and the NR base station through the Xn interface in the main CU1, and the terminal receives shunted downlink data from the LTE base station and the NR base station through the dual-connection and performs reordering processing.
When the auxiliary LTE base station detects the congestion of a downlink through link detection, calculating the information of the largest data packet which can be processed by the auxiliary LTE base station currently, and taking the SN of the data packet as the congestion SN; congestion SN is carried in DDDS and reports the secondary LTE base station congestion to the main CU1 over Xn interface. Or the auxiliary LTE base station sets the bearer level data application amount to zero in the DDDS, carries information that the bearer level data application amount is set to zero in the DDDS, and reports the auxiliary LTE base station congestion to the main CU1 through the Xn interface.
The master CU1 side learns that the auxiliary LTE base station is congested, and suspends continuously sending downlink data to the auxiliary LTE base station; meanwhile, the following packet is sent through the other side master DU 1. The UE receives data through the master DU 1.
According to the air interface link congestion feedback method provided by the embodiment of the invention, under the condition that the CU/DU is separated, when the side link of the DU is congested, the CU side can rapidly change the shunting strategy or perform link conversion according to the congestion indication information reported by the DU, so that the data transmission efficiency is improved, and the technical requirements of 5G high-speed transmission, rapid switching and the like are met.
Second embodiment
As shown in fig. 7, a second embodiment of the present invention provides an air interface link congestion feedback apparatus, where the apparatus includes a DU21 and a CU 22;
the DU21 is used for performing congestion detection on a downlink; if the congestion of the downlink is detected, generating congestion indication information; and reporting the congestion indication information to CU 22.
In this embodiment, the DU21 performs congestion detection on the downlink based on the following information:
and at least one of CQI measurement report, SRS measurement, downlink cache data transmission delay, RLC retransmission times and HARQ retransmission times measurement reported by the terminal.
In this embodiment, the DU21 is further configured to calculate a congestion SN and use the congestion SN as congestion indication information when downlink congestion is detected, or set a bearer level data application amount to zero and use the bearer level data application amount set to zero as congestion indication information.
In this embodiment, the DU21 calculates the congestion SN based on the following information:
at least one of the data caching condition of the DU, the status report information fed back by the user terminal, the air interface link condition, the HARQ information of the MAC and the ARQ information of the RLC.
In this embodiment, the DU21 is further configured to calculate a sequence number of a largest data packet that can be currently processed by the DU21, and use the sequence number of the data packet as the congestion sequence number.
The CU22 is configured to obtain congestion indication information reported by the DU 21; and adjusting the link according to the congestion indication information.
In this embodiment, the DU21 reports the congestion indication information to the CU22 through the DDDS, and the CU22 performs link adjustment according to the congestion indication information after acquiring the congestion indication information reported by the DU 21.
To better explain the present embodiment, the following describes the processing timing sequence of the air interface link congestion feedback in different application scenarios with reference to fig. 8 to fig. 11:
as shown in fig. 8, the congestion processing is distributed between two DUs for the same CU, the data is distributed between two intra-site DUs via two F1 interfaces in the CU, and the terminal receives the distributed downlink data via the two DUs and performs the reordering processing.
When detecting the downlink congestion of DU1 through link detection, DU1 calculates the information of the largest data packet that can be processed by current DU1, and takes the SN of the data packet as the congestion SN; the DDDS carries congestion SN and reports DU1 congestion to CUs via F1 interface. Or the DU1 sets the bearer level data application amount to zero in the DDDS, carries information that the bearer level data application amount is set to zero in the DDDS, and reports the congestion of the DU1 to the CU through the F1 interface.
The CU side knows that DU1 is congested, and suspends continuously sending downlink data to DU 1; meanwhile, the following data packet is transmitted through the other side DU 2. The UE receives data through DU 2.
As shown in fig. 9, the same CU lower data is subjected to congestion transmission between two DUs, the CU lower data is subjected to intra-station DU multiplexing transmission via two F1 interfaces, and the terminal receives the same lower data via two DUs and performs the duplicate packet processing.
When detecting congestion of a downlink of DU1 through link detection, DU1 calculates information of a largest data packet which can be processed by current DU1, and takes SN of the data packet as congestion SN; congestion SN is carried in DDDS and DU1 congestion is reported to CUs over F1 interface. Or the DU1 sets the bearer level data application amount to zero in the DDDS, carries information that the bearer level data application amount is set to zero in the DDDS, and reports the DU1 congestion to the CU through the F1 interface.
The CU side knows that the DU1 is congested, closes the duplicate function of the DU1 side and suspends the continuous transmission of the downlink duplicate data to the DU 1; the CU side continues sending downstream data through DU 2. The UE receives data through DU 2.
As shown in fig. 10, in the NR-NR dual link congestion processing between different CUs, data is divided between two NR base stations DU at the main CU1 through an Xn interface, and the terminal receives the divided downlink data from the two NR base stations through the dual link and performs reordering processing.
When the auxiliary DU2 detects the congestion of the downlink of DU2 through link detection, the information of the largest data packet which can be processed by the current DU2 is calculated, and the SN of the data packet is taken as the congestion SN; congestion SN is carried in DDDS and DU2 congestion is reported to the main CU1 over Xn interface. Or the DU2 sets the bearer level data application amount to zero in the DDDS, carries information that the bearer level data application amount is set to zero in the DDDS, and reports the congestion of the DU2 to the main CU1 through the Xn interface.
The side of the master CU1 knows that the auxiliary DU2 is congested, and suspends the continuous transmission of downlink data to the auxiliary DU 2; meanwhile, the following packet is transmitted through the other side master DU 1. The UE receives data through the master DU 1.
As shown in fig. 11, in the LTE-NR dual-connection congestion processing between different CUs, data is shunted between the LTE base station and the NR base station through the Xn interface in the main CU1, and the terminal receives shunted downlink data from the LTE base station and the NR base station through the dual-connection and performs reordering processing.
When the auxiliary LTE base station detects the congestion of a downlink through link detection, calculating the information of the largest data packet which can be processed by the auxiliary LTE base station currently, and taking the SN of the data packet as the congestion SN; congestion SN is carried in DDDS and reports the secondary LTE base station congestion to the main CU1 over Xn interface. Or the auxiliary LTE base station sets the bearer level data application amount to zero in the DDDS, carries information that the bearer level data application amount is set to zero in the DDDS, and reports the auxiliary LTE base station congestion to the main CU1 through the Xn interface.
The main CU1 side learns that the auxiliary LTE base station is congested, and suspends the continuous transmission of downlink data to the auxiliary LTE base station; meanwhile, the following packet is sent through the other side master DU 1. The UE receives data through the master DU 1.
The air interface link congestion feedback device of the embodiment of the invention can rapidly change the flow distribution strategy or perform link conversion according to the congestion indication information reported by the DU by the CU side when the side link of the DU is congested under the condition of CU/DU separation, thereby improving the data transmission efficiency and meeting the technical requirements of 5G high-speed transmission, rapid switching and the like.
Third embodiment
As shown in fig. 12, a third embodiment of the present invention provides an air interface link congestion feedback device, where the device includes: a memory 31, a processor 32, and an air interface link congestion feedback program stored in the memory 31 and capable of running on the processor 32, where the air interface link congestion feedback program, when executed by the processor 32, is configured to implement the following steps of:
the DU carries out congestion detection on a downlink;
if the congestion of the downlink is detected, generating congestion indication information;
and reporting the congestion indication information to a CU so that the CU can adjust the link according to the congestion indication information.
When the processor 32 executes the air interface link congestion feedback program, the program is further configured to implement the following steps of the air interface link congestion feedback method:
the DU congestion detection for the downlink is based on the following information:
and at least one of CQI measurement report, SRS measurement, downlink cache data transmission delay, RLC retransmission times and HARQ retransmission times measurement reported by the terminal.
When the processor 32 executes the air interface link congestion feedback program, the program is further configured to implement the following steps of the air interface link congestion feedback method:
and if the congestion of the downlink is detected, calculating a congestion sequence number and taking the congestion sequence number as congestion indication information, or setting the bearer level data application amount to be zero and taking the bearer level data application amount set to be zero as the congestion indication information.
When the processor 32 executes the air interface link congestion feedback program, the program is further configured to implement the following steps of the air interface link congestion feedback method:
calculating the congestion sequence number based on:
at least one of data caching condition of DU, status report information fed back by user terminal, air interface link condition, HARQ information of MAC and ARQ information of RLC.
When the processor 32 executes the air interface link congestion feedback program, the program is further configured to implement the following steps of the air interface link congestion feedback method:
and calculating the sequence number of the largest data packet which can be currently processed by the DU, and taking the sequence number of the data packet as the congestion sequence number.
According to the air interface link congestion feedback device provided by the embodiment of the invention, under the condition that the CU/DU is separated, when a side link of the DU is congested, the CU side can rapidly change a flow distribution strategy or perform link conversion according to congestion indication information reported by the DU, so that the data transmission efficiency is improved, and the technical requirements of 5G high-speed transmission, rapid switching and the like are met.
Fourth embodiment
A fourth embodiment of the present invention provides a computer-readable storage medium, where an air interface link congestion feedback program is stored in the computer-readable storage medium, and the air interface link congestion feedback program is used, when being executed by a processor, to implement the steps of the air interface link congestion feedback method according to the first embodiment.
The computer-readable storage medium of the embodiment of the invention can rapidly change the shunt strategy or perform link switching according to the congestion indication information reported by the DU by the CU side when the chain link of the DU is congested under the condition of CU/DU separation, thereby improving the data transmission efficiency and meeting the technical requirements of 5G high-speed transmission, rapid switching and the like.
It should be noted that the device embodiment and the method embodiment belong to the same concept, and specific implementation processes thereof are described in the method embodiment in detail, and technical features in the method embodiment are correspondingly applicable in the device embodiment, which is not described herein again.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, and are not to be construed as limiting the scope of the invention. Those skilled in the art can implement the invention in various modifications, such as features from one embodiment can be used in another embodiment to yield yet a further embodiment, without departing from the scope and spirit of the invention. Any modification, equivalent replacement and improvement made within the technical idea of using the present invention should be within the scope of the right of the present invention.

Claims (12)

1. A congestion feedback method for an air interface link, the method comprising the steps of:
the distribution unit DU carries out congestion detection on the downlink;
if the congestion of the downlink is detected, generating congestion indication information;
reporting the congestion indication information to a Central Unit (CU) so that the CU can adjust a link according to the congestion indication information;
the application scenarios of the air interface link congestion feedback method include: the method comprises the steps of carrying out flow distribution congestion processing on data under the same CU between two DUs, carrying out duplicate transmission congestion processing on the data under the same CU between the two DUs, carrying out NR-NR dual-connection congestion processing between different CUs and carrying out LTE-NR dual-connection congestion processing between different CUs.
2. The method of claim 1, wherein the DU performs congestion detection on the downlink based on the following information:
at least one of a CQI measurement report, a Sounding Reference Signal (SRS) measurement, a downlink cache data transmission delay, Radio Link Control (RLC) retransmission times and hybrid automatic repeat request (HARQ) retransmission times measurement reported by a terminal.
3. The method of claim 1, wherein the step of generating congestion indication information if downlink congestion is detected comprises the steps of:
and if the congestion of the downlink is detected, calculating a congestion sequence number and taking the congestion sequence number as congestion indication information, or setting the bearer level data application amount to be zero and taking the bearer level data application amount set to be zero as the congestion indication information.
4. The method of claim 3, wherein the congestion sequence number is calculated based on:
at least one of data caching condition of DU, state report information fed back by the user terminal, air interface link condition, HARQ information of medium access control MAC and automatic repeat request ARQ information of RLC.
5. The method according to claim 3, wherein said calculating congestion sequence numbers comprises the steps of:
and calculating the sequence number of the largest data packet which can be currently processed by the DU, and taking the sequence number of the data packet as the congestion sequence number.
6. An air interface link congestion feedback device is characterized in that the device comprises a DU and a CU;
the DU is used for carrying out congestion detection on a downlink; if the congestion of the downlink is detected, generating congestion indication information; reporting the congestion indication information to the CU;
the CU is used for acquiring congestion indication information reported by the DU; adjusting a link according to the congestion indication information;
the application scenarios of the air interface link congestion feedback device include: the method comprises the steps of carrying out flow distribution congestion processing on data under the same CU between two DUs, carrying out duplicate transmission congestion processing on the data under the same CU between the two DUs, carrying out NR-NR dual-connection congestion processing between different CUs and carrying out LTE-NR dual-connection congestion processing between different CUs.
7. The apparatus of claim 6, wherein the DU is configured to perform congestion detection on a downlink based on:
at least one of a CQI measurement report reported by a terminal, SRS measurement of a sounding reference signal, downlink cache data transmission delay, Radio Link Control (RLC) retransmission times and hybrid automatic repeat request (HARQ) retransmission times measurement.
8. The apparatus of claim 6, wherein the DU is further configured to calculate a congestion sequence number and use the congestion sequence number as the congestion indication information or set a bearer level data application amount to zero and use the bearer level data application amount set to zero as the congestion indication information if the downlink congestion is detected.
9. The apparatus of claim 8, wherein the DU calculates the congestion sequence number based on:
at least one of data caching condition of DU, status report information fed back by user terminal, air interface link condition, HARQ information of medium access control MAC, and automatic repeat request ARQ information of RLC.
10. The apparatus of claim 8, wherein the DU is further configured to calculate a sequence number of a largest data packet that the DU can currently handle, and use the sequence number of the data packet as a congestion sequence number.
11. An air interface link congestion feedback device, comprising: a memory, a processor, and an air interface link congestion feedback program stored in the memory and operable on the processor, where the air interface link congestion feedback program, when executed by the processor, implements the steps of the method according to any one of claims 1 to 5 for congestion feedback of an air interface link.
12. A computer-readable storage medium, wherein an air interface link congestion feedback program is stored on the computer-readable storage medium, and when being executed by a processor, the computer-readable storage medium implements the steps of the air interface link congestion feedback method according to any one of claims 1 to 5.
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