Downlink and uplink data packet forwarding method and evolved base station based on s1 handover

一种演进基站、转发方法的技术，应用在无线通信、无线网络协议、电气元件等方向，能够解决无法保证数据包无损迁移等问题

Active Publication Date: 2020-06-16
HUAWEI TECH CO LTD
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the LTE system, in order to reduce packet loss during S1 handover, the data packet forwarding method based on S1 handover is generally adopted. However, the target eNodeB cannot guarantee the lossless migration of data packets during the data forwarding process.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Downlink and uplink data packet forwarding method and evolved base station based on s1 handover
  • Downlink and uplink data packet forwarding method and evolved base station based on s1 handover
  • Downlink and uplink data packet forwarding method and evolved base station based on s1 handover

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] In this embodiment, the message including the PDCP SN information of the data packet is a relocation request message, and the PDCP SN information of the data packet is the relationship information between the PDCP SN and the GTP-U SN.

[0075] Such as image 3 As shown, after step 2, it is known that the downlink data packet can no longer be sent to the source eNodeB. In this embodiment, when the source eNodeB decides to initiate a relocation request, it includes the relationship information between the PDCP SN and the GTP-U SN in the relocation request message, such as the specific value corresponding to the PDCP SN and the GTP-U SN of the data packet, Or the correspondence relation between PDCP SN and GTP-U SN. If the target SGW carries the GTP-U SN when delivering the third type of data packet, it can perform PDCP SN numbering on the third type of data packet according to the relationship information between the PDCP SN and the GTP-U SN.

[0076] The second type of...

Embodiment 2

[0084] In this embodiment, the message including the PDCP SN information of the data packet is a handover confirmation message, and the PDCP SN information of the data packet is the largest PDCP SN of the data packet received by the user terminal.

[0085] When the UE successfully synchronizes to the target cell, it contacts the target eNodeB, such as image 3 Step 11 is shown. At this time, the target eNodeB starts a timer, and the UE uses the handover confirmation message "Handover Confirm" in step 11 to tell the target eNodeB the state of the relevant received data packet, including the maximum PDCP SN of the data packet received by the UE.

[0086] The handover confirmation message sent by the user terminal to the target eNodeB includes: the largest PDCP SN of the data packet received by the user terminal, and the target eNodeB performs PDCP SN numbering on the second type of data packet and the third type of data packet as follows: if When the second type of data packet ...

Embodiment 3

[0093] Such as image 3 As shown, after step 10, after the source eNodeB sends the handover command to the UE, it knows that the connection with the UE is interrupted, and data forwarding should be performed. In step 10, after the source eNodeB sends the handover command to the user terminal, and in step 11, before the user terminal sends a handover confirmation message to the target eNodeB, as Figure 4 Shown is the flow chart of Embodiment 3 of the downlink data packet forwarding method based on S1 handover in the present invention, which also includes: the source eNodeB sends a newly constructed control message to the target eNodeB via the source MME and the target MME, or the source eNodeB directly passes the X2 interface A newly constructed control message is sent to the target eNodeB, and the newly constructed control message includes the initial PDCP SN at which the target eNodeB begins to perform PDCP SN numbering, and the GTP-U SN corresponding to the PDCP SN. If the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The embodiment of the present invention relates to a downlink data packet forwarding method based on S1 handover, including: when the downlink data packet to be forwarded includes a data packet that has not been processed by the Packet Data Convergence Protocol (PDCP), according to the PDCP SN that contains the Packet Data Convergence Protocol sequence number information message, numbering the data packets that have not been processed by PDCP; sending the downlink data packets to the user terminal according to the PDCP SN corresponding to the data packets included in the downlink data packets. The embodiment of the present invention also relates to an uplink data packet forwarding method based on S1 handover, comprising: receiving status report information of the data packet sent by the target eNodeB; and sending the data packet according to the status report information of the data packet. The embodiment of the present invention also relates to another S1 handover-based downlink data packet forwarding method and an evolved base station. The embodiment of the present invention realizes lossless forwarding of data packets when S1 switching occurs.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a downlink and uplink data packet forwarding method based on S1 switching and an evolved base station. Background technique [0002] The Long Term Evolution (LTE for short) system adopts a flat Radio Access Network (RAN for short) structure and cancels the Radio Network Control (RNC for short), figure 1 is a schematic structural diagram of the LTE system, such as figure 1 As shown, the LTE radio access network includes an evolved base station (evolved-NodeB, hereinafter referred to as eNodeB) and an evolved packet core (Evolved Packer Core, referred to as EPC). The eNodeB evolved from the main network elements of the NodeB and RNC in the R6 stage, and the eNodeBs are interconnected in a mesh manner through the X2 interface. The interface between eNodeB and EPC is called S1 interface. The EPC includes a mobility control plane entity (Mobility Management Entity, ref...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityPatents(China)
IPC IPC(8): H04W36/02
CPCH04W36/02H04W72/12H04W80/02H04W88/04H04W36/0011
Inventor黄英
OwnerHUAWEI TECH CO LTD