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x2 switching method and device

A technology of handover success and handover response, which is applied in the field of communication, can solve problems such as increased handover delay, complicated handover process processing, and no solution proposed, and achieves the effect of simplifying the process and improving the handover rate

Inactive Publication Date: 2017-09-15
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing handover process, if the target eNB has not received the sequence number status transmission message when it receives the reconfiguration completion, it will delay sending the path switching message, which will increase the handover delay, and in order to wait for the sequence number at the same time Starting two timers for the number status transmission message and the reconfiguration completion message will also make the handover process complicated
To address these problems, no effective solutions have been proposed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0068] In this example, the serial number status transmission message arrives before the reconfiguration complete message is received. According to the X2 handover process of this example, such as Figure 4 shown, including:

[0069] Step S402, the UE accesses the source eNB, establishes two AM mode services, and sends a measurement report of the A3 event to the source eNB. The source eNB decides that X2 handover needs to be performed, and sends a handover request message to the target eNB through the X2 port. The handover request message Including but not limited to UE's RRC context, UE capability and other information;

[0070] Step S404, the target eNB allocates resources for the UE to be handed over according to the information in the handover request message, prepares radio resource information, and waits for the UE to access;

[0071] Step S406, the target eNB constructs the reconfiguration message sent to the UE through the source eNB, puts it into the transmission con...

example 2

[0082] In this example, the serial number status transmission message arrives after the reconfiguration complete message is received. According to the X2 handover process of this example, such as Figure 5 shown, including:

[0083] Step S502, the UE accesses the source eNB, establishes three AM mode services, and sends a measurement report of the A3 event to the source eNB. The source eNB decides that X2 handover needs to be performed, and sends a handover request message to the target eNB through the X2 port. The handover request message Including but not limited to UE's RRC context, UE capability and other information;

[0084] Step S504, the target eNB allocates resources for the UE to be handed over according to the information in the handover request message, prepares radio resource information, and waits for the UE to access;

[0085] Step S506, the target eNB builds the reconfiguration message sent to the UE through the source eNB, puts it in the transmission containe...

example 3

[0096] In this example, the SN status transmission message is not received by the target eNB due to abnormal reasons, but no service in AM mode is successfully handed over. According to the X2 handover process of this example, as follows: Image 6 shown, including:

[0097] Step S602, the UE accesses the source eNB, establishes one default bearer service E-RAB1 in UM mode and two dedicated bearer services (E-RAB2 and E-RAB3) in AM mode, and sends a measurement report of the A3 event to the source eNB , the source eNB decides that X2 handover needs to be performed, and sends a handover request message to the target eNB through the X2 port; the handover request message includes but is not limited to the UE's RRC context, UE capability and other information;

[0098] Step S604, the target eNB allocates resources for the UE to be handed over according to the information in the handover request message, prepares radio resource information, and waits for the UE to access;

[0099] ...

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Abstract

The present invention provides an X2 handover method and device. The above method includes: after the target eNB sends a handover response message, it sets a flag for the handover UE to indicate whether the sequence number status transmission message is received, and sets the flag to Not received; after receiving the reconfiguration completion message, the target eNB does not determine whether it has received the sequence number status transmission message, and directly sends the path conversion message to the core network. Through the technical solution provided by the present invention, the problem that the existing X2 handover target side receives the reconfiguration completion message without receiving the sequence number status transmission message will cause the handover delay to increase, thereby simplifying the processing of the target eNB. , the effect of improving the switching rate.

Description

technical field [0001] The present invention relates to the field of communications, and in particular, to an X2 handover method and device. Background technique [0002] Mobility management is an important attribute of mobile communication systems, and handover is the key content of mobility management. Reasonable handover behavior can reduce the possibility of UE dropping calls, reduce service data interruption, and improve system stability and user experience. [0003] In an LTE (Long Term Evolution, Long Term Evolution) system, a state of a UE (User Equipment, user terminal) is divided into a connected state (RRC_CONNECTED) and an idle state (RRC_IDLE). When the UE in the RRC_CONNECTED state moves from the serving cell to another cell, a handover will be triggered to ensure uninterrupted services. [0004] When the UE is handed over from a cell of an eNB (Evolved NodeB, evolved base station, ie an LTE base station) to a cell of another eNB, a handover across base statio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W36/08
CPCH04W36/0005H04W36/0011H04W36/0033H04W36/0064H04W40/36
Inventor 彭聪
Owner ZTE CORP
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