CN109104435B - Method for realizing data in-sequence transmission - Google Patents

Method for realizing data in-sequence transmission Download PDF

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CN109104435B
CN109104435B CN201811190262.3A CN201811190262A CN109104435B CN 109104435 B CN109104435 B CN 109104435B CN 201811190262 A CN201811190262 A CN 201811190262A CN 109104435 B CN109104435 B CN 109104435B
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packet
base station
station node
header
data packet
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CN109104435A (en
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钱骅
贾建鑫
康凯
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Shanghai Advanced Research Institute of CAS
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Shanghai Advanced Research Institute of CAS
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/06Notations for structuring of protocol data, e.g. abstract syntax notation one [ASN.1]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607Details of the supervisory signal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/10Connection setup
    • H04W76/15Setup of multiple wireless link connections

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention provides a method for realizing uplink data sequential transmission during Qos flow remapping, which constructs an end mark packet by reserving a position 1 at a 1-bit position in an Internet Protocol (IP) header, has simple operation and convenient realization, effectively reduces the processing overhead of an SDAP layer when a receiving end identifies the uplink end mark packet, and can reserve 2 bits for the SDAP header, and can enlarge the size of a QFI field in the discussed uplink SDAP header by 1 bit.

Description

Method for realizing data in-sequence transmission
Technical Field
The present invention relates to the field of wireless communication, and in particular, to a dual connectivity scenario in 5G cellular mobile communication, and in particular, to a method for implementing in-order transmission of uplink data during Qos flow remapping.
Background
Multiple Radio Access Technology-Dual connectivity (MR-DC) is a generalization of Dual connectivity within the Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRA) described in technical specification 36.300. Wherein, a User Equipment (UE) provides access service by two different base stations, one provides E-UTRA access, and the other provides New Radio (NR) access. One base station serves as a master Node (Main Node), and the other base station serves as a Secondary Node (SN). The NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity, referred to as NE-DC) and NR-NR Dual Connectivity (NR-DC) are two MR-DC modes, where Quality of Service (Qos) flows may be remapped from the primary node to the secondary node during traffic offloading or mobile handover, and after Qos flow remapping, in-sequence transmission of uplink data cannot be guaranteed.
In order to ensure in-order transmission of uplink data during Qos flow remapping, the relevant literature has proposed some proposals to address this problem. Specifically, existing solutions mainly use three ways to construct the end-marker packet:
the first is to construct a SDAP Data (Data) Protocol Data Unit (PDU) by reserving a bit position 1 in a Service Data Adaptation Protocol (SDAP) header;
the second is to construct an SDAP Control (Control) PDU by reserving one of the SDAP headers for position 1;
the third is to construct the SDAP header by reserving one of the SDAP headers for position 1.
It can be seen that all three solutions described above are to construct the end-marker packet by reserving one bit in the SDAP header in position 1. However, occupying a reserved bit in the SDAP header to construct the end-marker packet may create processing overhead in the SDAP layer and limit the quality of service Flow indicator (QoS Flow ID, QFI) field size in the uplink SDAP header.
Therefore, how to effectively design an end marker packet to ensure uplink in-sequence transmission after Qos stream remapping is a technical problem to be solved at present.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a method for implementing in-sequence transmission of uplink data during Qos flow remapping, which solves the above problems in the prior art by constructing an end-marker packet in such a manner that a 1-bit reservation position 1 is made in an Internetwork Protocol (IP) header.
To achieve the above and other related objects, the present invention provides an end-marker packet applied to a dual connectivity scenario, where the end-marker packet is a data packet, a header of the data packet is composed of an SDAP header, and a payload of the data packet is composed of an IP packet; the IP packet is an IP data packet which comprises an IP header and an IP load; wherein: the reserved bit in the IP header is set to 1.
In an embodiment of the present invention, the reserved bits in the IP header are 1-bit reserved bits.
To achieve the above and other related objects, the present invention provides a method for constructing an end-marker packet in a dual connectivity scenario, where the end-marker packet is a data packet, a header of the data packet is composed of an SDAP header, and a payload of the data packet is composed of an IP packet; the IP packet is an IP data packet which comprises an IP header and an IP load; the method comprises the following steps: and reserving the reserved position 1 in the IP header.
In an embodiment of the present invention, the reserved bits in the IP header are 1-bit reserved bits.
To achieve the above and other related objects, the present invention provides a system for constructing an end-marker packet in a dual connectivity scenario, where the end-marker packet is a data packet, a header of the data packet is composed of an SDAP header, and a payload of the data packet is composed of an IP packet; the IP packet is an IP data packet which comprises an IP header and an IP load; the system comprises: and the 1 setting module is used for setting the reserved position 1 in the IP header.
In an embodiment of the present invention, the reserved bits in the IP header are 1-bit reserved bits.
To achieve the above and other related objects, the present invention provides a method for implementing in-order transmission of uplink data during Qos flow remapping, applied to a secondary base station node; the method comprises the following steps: sending a Qos stream remapping command to user equipment; receiving a start indication transmitted by a master base station node; the start indication is used to inform the secondary base station node that the Qos flow has been mapped to the secondary base station node by the master base station node; wherein the start indication is sent by the primary base station node to the secondary base station node when the primary base station node correctly receives an end marker packet, and the end marker packet is constructed by the user equipment according to the method for constructing an end marker packet in a dual connectivity scenario after the user equipment correctly receives the Qos flow remapping command, and is sent to the primary base station node as a last data packet; and when the starting indication is correctly received, submitting the uplink data sent by the user equipment to a core network.
To achieve the above and other related objects, the present invention provides a system for implementing in-order transmission of uplink data during Qos flow remapping, applied to a secondary base station node; the system comprises: a communication module, configured to send a Qos stream remapping command to a user equipment; receiving a start indication transmitted by a master base station node; the start indication is used to inform the secondary base station node that the Qos flow has been mapped to the secondary base station node by the master base station node; wherein the start indication is sent by the primary base station node to the secondary base station node when the primary base station node correctly receives an end marker packet, and the end marker packet is constructed by the user equipment according to the method for constructing an end marker packet in a dual connectivity scenario after the user equipment correctly receives the Qos flow remapping command, and is sent to the primary base station node as a last data packet; and the processing module is used for submitting the uplink data sent by the user equipment to a core network when the starting indication is correctly received.
To achieve the above and other related objects, the present invention provides a secondary base station node, including: the system for implementing in-order transmission of uplink data during Qos flow remapping is described.
To achieve the above and other related objects, the present invention provides a method for implementing in-order uplink data transmission during Qos flow remapping, applied to a user equipment; the method comprises the following steps: receiving a Qos stream remapping command sent by a secondary base station node; constructing said end marker packet when said Qos flow remapping command is received correctly; sending the end-marker packet to the master base station node as the last data packet.
To achieve the above and other related objects, the present invention provides a system for implementing in-order uplink data transmission during Qos flow remapping, applied to a user equipment; the system comprises: a communication module, configured to receive a Qos stream remapping command sent by a secondary base station node; transmitting the constructed end-marker packet to the master base station node as a last data packet; a processing module for constructing said end marker packet when said Qos stream remapping command is received correctly.
To achieve the above and other related objects, the present invention provides a user equipment, comprising: the system for implementing in-order transmission of uplink data during Qos flow remapping is described.
To achieve the above and other related objects, the present invention provides a method for implementing in-order transmission of uplink data during Qos flow remapping, applied to a master base station node; the method comprises the following steps: receiving an end marker packet transmitted by the user equipment as a last data packet; the end mark packet is a data packet, the head of the data packet is composed of an SDAP header, and the load of the data packet is composed of an IP packet; the IP packet is an IP data packet which comprises an IP header and an IP load; wherein: the reserved position in the IP header is set to 1; when the end marker packet is received correctly, sending a start indication to a secondary base station node to inform the secondary base station node that a Qos flow has been mapped to the secondary base station node by the primary base station node.
To achieve the above and other related objects, the present invention provides a system for implementing in-order transmission of uplink data during Qos flow remapping, applied to a master base station node; the system comprises: a communication module for receiving an end marker packet transmitted by the user equipment as a last data packet; the end mark packet is a data packet, the head of the data packet is composed of an SDAP header, and the load of the data packet is composed of an IP packet; the IP packet is an IP data packet which comprises an IP header and an IP load; wherein: the reserved position in the IP header is set to 1; a processing module to send a start indication to a secondary base station node to inform the secondary base station node that a Qos flow has been mapped to the secondary base station node by the primary base station node when the end marker packet is correctly received.
To achieve the above and other related objects, the present invention provides a master base station node, including: the system for implementing in-order transmission of uplink data during Qos flow remapping is described.
To achieve the above and other related objects, the present invention provides a storage medium having stored therein a computer program that, when loaded and executed by a processor, implements the method for constructing an end-marker packet in a dual connectivity scenario or implements the method for in-order delivery of uplink data during Qos flow remapping.
As described above, the method for implementing in-order uplink data transmission during Qos stream remapping of the present invention has the following steps
Has the advantages that:
1. the end marker packet is constructed only by reserving 1bit in the IP header to a position 1, and the method is easy to realize;
2. the processing overhead of the SDAP layer when the receiving end identifies the uplink end mark packet can be reduced;
3. since the end marker packet is represented by reserving one of the IP headers for position 1, 2 bits can be reserved for the SDAP header, so that the QFI field size in the upstream SDAP header still in question can be expanded by 1bit, when expanding from 6 bits to 7 bits, QFI can support 64 Access Stratum (AS for short) QFI IDs and 79 Non-Access Stratum (Non-Access Stratum QFI ID.. furthermore, if a 7-bit QFI is used in the upstream SDAP header, no NAS QFI ID to qfas i ID remapping mechanism is needed.
Drawings
Fig. 1 is a schematic structural diagram of an end marker packet according to an embodiment of the present invention.
Fig. 2 is a flowchart illustrating a method for implementing in-order uplink data transmission during Qos flow remapping according to an embodiment of the present invention.
Fig. 3 is a block diagram illustrating a system for in-order uplink data transmission during Qos flow remapping according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
Fig. 1 is a schematic structural diagram of an end marker packet in an embodiment of the present invention, where the end marker packet is a data packet and is mainly used to end transmission of a current quality of service flow.
In this embodiment, the header of the end-marker packet is composed of an SDAP (Service Data attachment Protocol) header, and the payload thereof is composed of an IP packet. The IP packet is an IP data packet that includes two parts, an IP header and an IP payload.
In particular, the end-marker packet of the present embodiment differs from the prior art in that:
in the prior art, a 1bit of the SDAP header is reserved at a position 1 to ensure the sequential transmission of uplink data during the remapping of QoS streams under a dual-connection scene;
in this embodiment, the reserved bit (see the 1bit em bit in the figure) in the IP header is set to 1, so that the processing overhead of the SDAP layer when the receiving end identifies the uplink end marker packet is effectively reduced, and 2 bits can be reserved for the SDAP header, so as to enlarge the QFI size in the uplink SDAP header in question by 1 bit.
In detail, in the embodiment, the field size of the QFI can be enlarged from 6 bits to 7 bits, which can support 64 Access Stratum (AS) QFI IDs and 79 Non-Access Stratum (Non-Access Stratum QFI IDs).
Furthermore, if a 7-bit QFI is used in the upstream SDAP header, there is no need to use a NAS QFI ID to AS QFI ID remapping mechanism.
Since other parts of the structure flag packet of the present embodiment adopt the prior art and can change the content according to the actual need, the description is not repeated.
The end marker packet in the foregoing embodiment may be constructed by using a system for constructing an end marker packet in a dual connectivity scenario, specifically, the system includes: and a module for setting 1, wherein the module for setting 1 is used for setting a reserved position 1 in the IP header.
Those skilled in the art should understand that the division of the modules in the construction system is only a logical division, and the actual implementation can be fully or partially integrated into one or more physical entities. And the modules can be realized in a form that all software is called by the processing element, or in a form that all the modules are realized in a form that all the modules are called by the processing element, or in a form that part of the modules are called by the hardware.
Fig. 2 is a flowchart illustrating a method for implementing in-order uplink data transmission during Qos flow remapping according to an embodiment of the present invention.
The Secondary base station Node (i.e., the Secondary Node (SN) introduced in the background art) in this embodiment sends a Qos flow (Quality of Service) remapping command to the UE, and if the Qos flow remapping command is correctly received by the UE, the UE constructs an end marker packet with a 1-bit reserved bit (see EM bit in fig. 1) in an IP header (IP, Internet Protocol, internetworking Protocol) at position 1, and sends the end marker packet to the primary base station Node (i.e., the primary Node (Main Node, MN) introduced in the background art) as the last data packet. If the end marker packet is correctly received by the primary base station node, the primary base station node sends a start instruction to the secondary base station node to notify the secondary base station node that the Qos flow is mapped to the secondary base station node by the primary base station node, wherein the start instruction is a kind of signaling used for notifying the secondary base station node that the uplink data can be submitted. And if the starting indication is correctly received by the secondary base station node, the secondary base station node starts submitting uplink data sent by the UE to the core network, wherein the uplink data are the data sent to the base station by the UE and then submitted to the core network through the base station.
The specific steps of the method for implementing in-sequence uplink data transmission during Qos flow remapping according to this embodiment will be described in detail as follows:
s21: the auxiliary base station node sends a Qos flow remapping command to the UE;
s22: if the Qos flow remapping command is correctly received by the UE, S23 is performed; otherwise, executing S24;
s23: the UE constructs an end marker packet by reserving a 1bit in the IP header to a position 1, wherein the packet consists of the SDAP header and the IP packet, and skips S25;
s24: the UE still transmits data to the core network through the secondary base station node;
s25: the UE transmits the end marker packet to the master node as the last data packet, and continues to perform S26;
s26: the end marker packet is correctly received by the primary base station node and, if so, jumps to S27; if not, go to S28;
s27: the main base station node sends a start instruction to the auxiliary base station node to inform the auxiliary base station node that the Qos flow is mapped to the auxiliary base station node by the main base station node, and S29 is continuously executed;
s28: continuing to wait for the UE to send an end marker packet;
s29: the start indication is correctly received by the secondary base station node, if so, S210 is executed; if not, executing S211;
s210: the auxiliary base station node starts to submit uplink data sent by the UE to a core network;
s211: and continuing to wait for the main base station node to transmit the start indication.
It is worth mentioning that all or part of the steps for implementing the above method embodiments may be implemented by hardware related to a computer program. Based upon such an understanding, the present invention also provides a computer program product comprising one or more computer instructions. The computer instructions may be stored in a computer readable storage medium. The computer-readable storage medium can be any available medium that a computer can store or a data storage device, such as a server, a data center, etc., that is integrated with one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
Fig. 3 is a schematic block diagram illustrating a system for implementing in-order uplink data transmission during Qos flow remapping according to an embodiment of the present invention, and each of the systems is mounted in a device as software to execute the method for implementing in-order uplink data transmission during Qos flow remapping described in the foregoing method embodiment when running. Since the technical principle of the embodiment of the system is similar to that of the embodiment of the method, repeated description of the same technical details is omitted.
The system for implementing uplink data in-sequence transmission during Qos flow remapping according to this embodiment is divided into three major parts, one part is a communication module 311 and a processing module 312 for the secondary base station node 31 to implement the corresponding method, the other part is a communication module 321 and a processing module 322 for the user equipment 32 to implement the corresponding method, and the other part is a communication module 331 and a processing module 332 for the primary base station node 33 to implement the corresponding method.
The communication module 311 is configured to send a Qos stream remapping command to the user equipment; receiving a start indication transmitted by a master base station node; the processing module 312 is configured to submit the uplink data sent by the ue to the core network when the start indication is correctly received.
The communication module 321 is configured to receive a Qos stream remapping command sent by a secondary base station node; transmitting the constructed end-marker packet to the master base station node as a last data packet; the processing module 322 is configured to construct an end-marker packet according to claim 1 when the Qos flow remapping command is received correctly.
The communication module 331 is configured to receive an end marker packet transmitted by the user equipment as a last data packet; the processing module 332 is configured to send a start indication to a secondary base station node when the end marker packet is correctly received to inform the secondary base station node that a Qos flow has been mapped to the secondary base station node by the primary base station node.
Those skilled in the art should understand that the division of the modules in the embodiment of fig. 3 is only a logical division, and the actual implementation can be fully or partially integrated into one or more physical entities. And the modules can be realized in a form that all software is called by the processing element, or in a form that all the modules are realized in a form that all the modules are called by the processing element, or in a form that part of the modules are called by the hardware.
In addition, the present invention further provides a secondary base station node based on the communication module 311 and the processing module 312, a user equipment based on the communication module 321 and the processing module 322, and a primary base station node based on the communication module 331 and the processing module 332, and the specific embodiments are described in detail in the foregoing embodiments, and are not repeated herein.
In summary, the method for implementing uplink data sequential transmission during Qos stream remapping according to the present invention constructs an end marker packet by reserving 1bit of position 1 in a header of an interconnection protocol between networks, which is simple and convenient to implement, effectively reduces the processing overhead of an SDAP layer when a receiving end identifies the uplink end marker packet, and can reserve 2 bits for the SDAP header, and can enlarge the size of a QFI field in the uplink SDAP header in question by 1 bit. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (14)

1. A method for constructing an end marker packet in a dual connectivity scenario is characterized in that the end marker packet is a data packet, the header of the data packet is composed of an SDAP header, and the payload of the data packet is composed of an IP packet; the IP packet is an IP data packet which comprises an IP header and an IP load; the method comprises the following steps:
and reserving the position 1 in the IP header to form an end mark packet used in a double-connection scene.
2. The method of claim 1, wherein the reserved bits in the IP header are 1-bit reserved bits.
3. A system for constructing an end marker packet in a dual connectivity scenario, wherein the end marker packet is a data packet, a header of the data packet is composed of an SDAP header, and a payload of the data packet is composed of an IP packet; the IP packet is an IP data packet which comprises an IP header and an IP load; the system comprises:
and the 1 setting module is used for setting a reserved position 1 in the IP header to form an end mark packet used in a double-connection scene.
4. The system of claim 3, wherein the reserved bits in the IP header are 1-bit reserved bits.
5. A method for enabling in-order transmission of uplink data during Qos flow remapping, characterized by being applied to a secondary base station node; the method comprises the following steps:
sending a Qos stream remapping command to user equipment;
receiving a start indication transmitted by a master base station node; the start indication is used to inform the secondary base station node that the Qos flow has been mapped to the secondary base station node by the master base station node; wherein the start indication is sent by the primary base station node to the secondary base station node upon correct reception of an end-marker packet, and the end-marker packet is constructed by the user equipment upon correct reception of the Qos flow remapping command, and sent to the primary base station node as the last data packet, according to the method of claim 1;
and when the starting indication is correctly received, submitting the uplink data sent by the user equipment to a core network.
6. A system for enabling in-order delivery of uplink data during Qos flow remapping, characterized by application to a secondary base station node; the system comprises:
a communication module, configured to send a Qos stream remapping command to a user equipment; receiving a start indication transmitted by a master base station node; the start indication is used to inform the secondary base station node that the Qos flow has been mapped to the secondary base station node by the master base station node; wherein the start indication is sent by the primary base station node to the secondary base station node upon correct reception of an end-marker packet, and the end-marker packet is constructed by the user equipment upon correct reception of the Qos flow remapping command, and sent to the primary base station node as the last data packet, according to the method of claim 1;
and the processing module is used for submitting the uplink data sent by the user equipment to a core network when the starting indication is correctly received.
7. A secondary base station node, comprising: the system for enabling in-order delivery of uplink data during Qos flow remapping of claim 6.
8. A method for enabling in-order transmission of uplink data during Qos flow remapping, applied to a user equipment; the method comprises the following steps:
receiving a Qos stream remapping command sent by a secondary base station node;
constructing an end marker packet applied to a dual connectivity scenario when the Qos flow remapping command is correctly received; the end mark packet is a data packet, the head of the data packet is composed of an SDAP header, and the load of the data packet is composed of an IP packet; the IP packet is an IP data packet which comprises an IP header and an IP load; wherein a reserved position in the IP header is set to 1;
sending the end-marker packet to the master base station node as the last data packet.
9. A system for in-order transmission of uplink data during Qos flow remapping, applied to a user equipment; the system comprises:
a communication module, configured to receive a Qos stream remapping command sent by a secondary base station node; transmitting the constructed end-marker packet to the master base station node as a last data packet;
a processing module for constructing an end marker packet applied to a dual connectivity scenario when the Qos flow remapping command is correctly received; the end mark packet is a data packet, the head of the data packet is composed of an SDAP header, and the load of the data packet is composed of an IP packet; the IP packet is an IP data packet which comprises an IP header and an IP load; wherein the reserved bit in the IP header is set to 1.
10. A user device, comprising: a system for enabling in-order delivery of uplink data during Qos flow remapping as recited in claim 9.
11. A method of enabling in-order transmission of uplink data during Qos flow remapping, applied to a master base station node; the method comprises the following steps:
receiving an end marker packet transmitted by the user equipment as a last data packet; the end mark packet is a data packet, the head of the data packet is composed of an SDAP header, and the load of the data packet is composed of an IP packet; the IP packet is an IP data packet which comprises an IP header and an IP load; wherein: setting a reserved position in the IP header to be 1 to form an end mark packet used in a double-connection scene;
when the end marker packet is received correctly, sending a start indication to a secondary base station node to inform the secondary base station node that a Qos flow has been mapped to the secondary base station node by the primary base station node.
12. A system for in-order transmission of uplink data during Qos flow remapping, applied to a master base station node; the system comprises:
a communication module for receiving an end marker packet transmitted by the user equipment as a last data packet; the end mark packet is a data packet, the head of the data packet is composed of an SDAP header, and the load of the data packet is composed of an IP packet; the IP packet is an IP data packet which comprises an IP header and an IP load; wherein: setting a reserved position in the IP header to be 1 to form an end mark packet used in a double-connection scene;
a processing module to send a start indication to a secondary base station node to inform the secondary base station node that a Qos flow has been mapped to the secondary base station node by the primary base station node when the end marker packet is correctly received.
13. A master base station node, comprising: the system for enabling in-order delivery of uplink data during Qos flow remapping of claim 12.
14. A computer readable storage medium, in which a computer program is stored, which, when being loaded and executed by a processor, implements the method of constructing an end-marker packet in a dual connectivity scenario, as claimed in claim 1, or implements the method of implementing in-order delivery of uplink data during Qos flow remapping, as claimed in claim 5, 8 or 11.
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