Downlink and uplink data packet forwarding method based on S1 handover and evolution base station

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: 2016-05-11
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 based on S1 handover and evolution base station
  • Downlink and uplink data packet forwarding method based on S1 handover and evolution base station
  • Downlink and uplink data packet forwarding method based on S1 handover and evolution base station

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Experimental program
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Embodiment 1

[0072] In this embodiment, the message including 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 the PDCPSN and the GTP-USN.

[0073] 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 PDCPSN and GTP-USN in the relocation request message, such as the specific value corresponding to the PDCPSN and GTP-USN of the data packet, or the PDCPSN and GTP-USN - The corresponding relational formula of USN. If the target SGW carries the GTP-USN when delivering the third type of data packet, it can perform PDCPSN numbering on the third type of data packet according to the relationship information between the PDCPSN and the GTP-USN.

[0074] The second type of data packet...

Embodiment 2

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

[0083] 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 "HandoverConfirm" in step 11 to tell the target eNodeB the status of the relevant received data packet, including 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 largest 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 as follows: if the second When the data packets of the se...

Embodiment 3

[0091] 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 PDCPSN from which the target eNodeB begins to number the PDCPSN, and the GTP-USN corresponding to the PDCPSN. If the target S...

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Abstract

The embodiment of the invention relates to a downlink data packet forwarding method based on S1 handover. The method comprises the following steps: when a downlink data packet to be forwarded contains a data packet that is not processed by a packet data convergence protocol PDCP, numbering the data packet that is not processed by PDCP according to a message containing a packet data convergence protocol sequence number PDCP SN; and sending the downlink data packet to a user terminal according to the PDCP SN corresponding to the data packet contained in the downlink data packet. The embodiment of the invention further relates to an uplink data packet forwarding method based on S1 handover. The uplink data packet forwarding method comprises the following steps: receiving state report information of a data packet sent by a target evolution base station eNodeB; and sending the data packet according to the state report information of the data packet. The embodiment of the invention further relates to another downlink data packet forwarding method based on S1 handover and an evolution base station. By implementing the downlink and uplink data packet forwarding method provided by the embodiment of the invention, lossless forwarding of data packet during S1 handover is realized.

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 (RadioAccessNetwork, RAN for short) structure, canceling the radio network controller (RadioNetworkControl, 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 pl...

Claims

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Application Information

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