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Cross-base station handover method and evolved base station

An evolved base station and cross-base station technology, applied in the field of communication, can solve the problems of downlink packet loss, the sequence of HandoverConfirm message and SNStatusTransfer message cannot be guaranteed, etc., to achieve the effect of reducing packet loss, lossless transmission user experience, and improving user experience

Active Publication Date: 2016-12-14
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The main purpose of the present invention is to provide a cross-base station handover method and an evolved base station eNB, so as to at least solve the downlink packet loss problem caused by the inability to guarantee the order of the HandoverConfirm message and the SN Status Transfer message in the above-mentioned existing handover process

Method used

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  • Cross-base station handover method and evolved base station
  • Cross-base station handover method and evolved base station

Examples

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Embodiment 1

[0039] image 3 It is a flowchart of a method for inter-base station handover according to Embodiment 1 of the present invention, as shown in image 3 shown, including the following steps:

[0040] Step S302, after receiving the handover indication message, the user plane of the eNB on the target side judges whether the SN Status Transfer message has been received before receiving the handover indication message;

[0041] Step S304, if not, cache the handover instruction message, and process the handover instruction message until the SN StatusTransfer message is received and processed.

[0042] In this embodiment, the handover indication message that arrives first is buffered, and the handover indication message is processed after receiving and processing the SN StatusTransfer message, so as to ensure that the user plane of the eNB on the target side is processing the PDCP layer downlink message during handover between base stations The correctness of the PDCP sequence numbe...

Embodiment 2

[0048] This implementation describes the processing flow of the handover instruction message for the user when the handover instruction message arrives at the eNB user plane on the target side earlier than the SN StatusTransfer message in the RLC confirmation mode for inter-base station handover, as shown in Figure 4 shown, including the following steps:

[0049] In step 402, after the eNB on the target side receives the HandoverConfirm message from the UE, the MAC sends a handover indication message to the upper layers, and the user plane receives the handover indication message.

[0050] Step 404, the user plane sets a flag to indicate that the handover indication message has been received.

[0051] Step 406, judging whether the SN Status Transfer message has been received through the set flag indicating whether the SN Status Transfer message has been received.

[0052] Step 408, in this scenario, the user plane has not received the SN Status Transfer message at this time,...

Embodiment 3

[0055] This implementation describes the processing flow of the user facing the SN Status Transfer message when the handover instruction message arrives at the user plane of the eNB on the target side earlier than the SN StatusTransfer message in RLC confirmation mode for cross-base station handover, as shown in Figure 5 shown, including the following steps:

[0056] Step 502: The control plane of the eNB on the source side sends an SN Status Transfer message to the control plane of the eNB on the target side, the control plane sends this message to the user plane, and the user plane receives the SN Status Transfer message;

[0057] Step 504: the user plane sets a flag to indicate that the SN Status Transfer message has been received;

[0058] Step 506: The user plane PDCP processes the SN Status Transfer message, including: updating the sequence number information of the PDCP (Next_PDCP_TX_SN / TX_HFN / Next_PDCP_RX_SN / RX_HFN / Last_Submitted_PDCP_RX_SN) according to the informati...

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Abstract

The present invention provides a cross-base station handover method and an evolved base station. The handover method includes: after receiving the handover indication message, the user plane of the eNB on the target side judges whether the serial number status transmission SN has been received before receiving the handover indication message. Status Transfer message; if not, cache the handover indication message until the SN Status Transfer message is received and processed before processing the handover indication message. In the present invention, by caching the handover indication message that first arrives at the user plane, the handover indication message is processed after receiving and processing the SN Status Transfer message, thereby ensuring that the PDCP sequence number information is correct when the target user plane processes the PDCP layer downlink message It reduces packet loss caused by inconsistency of PDCP sequence number information, thereby achieving lossless data transmission during handover and improving user experience.

Description

technical field [0001] The present invention relates to the communication field, and in particular, relates to a handover method across base stations and an evolved base station. Background technique [0002] Handover is a basic function to ensure user mobility in mobile communication systems, and ensuring lossless transmission of data during handover is a key technical issue. The following uses the X2 handover as an example to describe the problems existing in the prior art, and the same problem exists in cross-base station handovers in other scenarios. [0003] figure 1 Schematic diagram of the switching process for an existing X2. The specific handling of this switching scene includes: [0004] In step S102, the user equipment UE reports a Measure Report to the source eNB. [0005] In step S104, the source eNB sends a handover request (Handover Request) message to the target eNB. [0006] Step S106, after the control plane (RNLC) of the eNB on the target side receive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W28/14H04W36/08
Inventor 叶凌云王达菲张瑞霞
Owner ZTE CORP
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