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

A technology for evolving base stations and forwarding methods, applied in electrical components, wireless communications, wireless network protocols, etc., can solve problems such as the inability to guarantee lossless migration of data packets

Active Publication Date: 2016-03-30
HUAWEI TECH CO LTD
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  • 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

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  • 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

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Experimental program
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Embodiment 1

[0072] In this embodiment, the message containing the PDCPSN information of the data packet is a relocation request message, and the PDCPSN information of the data packet is the relationship information between PDCPSN and GTP-USN.

[0073] Such as image 3 As shown, after step 2, it is known that no more downlink data packets can be sent to the source eNodeB. In this embodiment, when the source eNodeB decides to initiate a relocation request, the relocation request message carries information about the relationship between PDCPSN and GTP-USN, such as the specific values ​​of PDCPSN and GTP-USN in the data packet, or PDCPSN and GTP -USN correspondence relationship. If the target SGW carries the GTP-USN when delivering the third type data packet, it can number the third type data packet according to the relationship information between PDCPSN and GTP-USN.

[0074] The second type of data packet forwarded by the source eNodeB can also carry the GTP-USN of the original S1 port to ensu...

Embodiment 2

[0082] In this embodiment, the message containing the PDCPSN information of the data packet is a handover confirmation message, and the PDCPSN information of the data packet is the maximum PDCPSN of the data packet received by the user terminal.

[0083] After the UE successfully synchronizes to the target cell, it will contact the target eNodeB, such as image 3 Step 11 shown. At this time, the target eNodeB starts a timer, and the UE uses the handover confirmation message "HandoverConfirm" in step 11 to inform the target eNodeB about the status of the received data packet, which specifically includes the maximum PDCPSN of the data packet received by the UE.

[0084] The handover confirmation message sent by the user terminal to the target eNodeB includes: the maximum PDCPSN of the data packet received by the user terminal, and the target eNodeB performs PDCPSN numbering on the second type of data packet and the third type of data packet. Specifically: When the second type data pa...

Embodiment 3

[0091] Such as image 3 As shown, after step 10, after the source eNodeB sends a handover command to the UE, it knows that the connection with the UE is interrupted and data should be forwarded. After step 10, the source eNodeB sends a handover command to the user terminal, step 11, before the user terminal sends a handover confirmation message to the target eNodeB, as Figure 4 The flow chart of Embodiment 3 of the downlink data packet forwarding method based on S1 handover of the present invention is shown, and it 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 uses the X2 interface A newly constructed control message is sent to the target eNodeB, and the newly constructed control message contains the initial PDCPSN for which the target eNodeB starts the PDCPSN number, and the GTP-USN corresponding to the PDCPSN. If the target SGW carries the GTP-USN when delive...

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Abstract

The embodiment of the present invention relates to a downlink data packet forwarding method based on S1 switching, 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 information message, numbering the data packets that have not been processed by PDCP; according to the PDCP corresponding to the data packets included in the downlink data packets? SN, sending the downlink data packet to the user terminal. 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 method for forwarding downlink and uplink data packets based on S1 handover and an evolved base station. Background technique [0002] The Long Term Evolution (LTE) system adopts a flat radio access network (RadioAccessNetwork, RAN) structure and cancels the radio network controller (RadioNetworkControl, RNC). figure 1 Schematic diagram of the structure 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 (EvolvedPackerCore, referred to as EPC). The eNodeB is evolved from the NodeB and RNC main network elements in the R6 stage. The eNodeBs are interconnected in a mesh mode through the X2 interface. The interface between eNodeB and EPC is called S1 interface. The EPC includes a mobile control plane entity (Mobility Management Entity, MME f...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H04W36/02H04W72/12H04W80/02H04W88/04
CPCH04W36/02H04W72/12H04W80/02H04W88/04H04W36/0011
Inventor黄英
OwnerHUAWEI TECH CO LTD