Method and apparatus for non-access message processing in switching

Abstract

The invention provides a processing method for NAS (Non access stratum) messages during switching and a device thereof. The method mainly comprises the following steps: when UE (user equipment) conducts switching between base stations, instruction information is sent to a core network through a source base station of the UE, and the instruction information instructs the core network to stop sending NAS messages to the UE before the switching of the UE is completed. The device mainly comprises access network equipment, user side equipment and network side equipment. The invention has the advantages that the processing of the NAS messages in switching is optimized. Therefore, not only the problem of loss of the NAS messages in the switching between eNBs can be solved, but also the core network can obtain the feedback for the sent NAS messages.

Description

technical field [0001] The present invention relates to the field of network communication, in particular to a method and device for processing NAS (Non Access Stratum, Non Access Stratum) messages during handover. Background technique [0002] A NAS (Non access stratum, non-access stratum) message is transparently transmitted through an access network, and is a message transmitted between a core network and a UE (User equipment, user equipment). The NAS message is initiated by the UE or the core network, and most of the NAS messages need to be fed back. For example, if the core network sends a message to the UE, the UE often needs to return a response message to the core network. [0003] Handover is a mobility processing procedure of UE in connected state. When the signal strength or signal quality of the current serving cell of the UE in the connected state decreases, or the network side considers policy, the network side will order the UE to perform handover, and the h...

AI Technical Summary

Problems solved by technology

[0013] Method 3 is a relatively simple solution, but the retransmission mechanism brings two problems: First, when the handover is successful, the message sent on the S1 port cannot be applied before it is completed

If the timer expires after the core network receives the handover completion message, it will cause a relatively long delay in NAS message processing

Second, in the case of handover failure, the core network needs to wait for the timer to expire after receiving the handover failure message before sending the NAS message to the source eNB, and the NAS processing delay will be relatively large

[0014] In addition, in method 2 and method 3, duplicate NAS messages may be received on the UE side

Duplicate NAS messages may cause two problems. One is that when the UE fails to respond to the initially received NAS message, the response message of the entire NAS message will be lost due to the discarding mechanism for the duplicate NAS message.

From the perspective of the core network, the core network sends a NAS message to the UE, but does not receive a response message, which is a loss of a NAS message

Second, if the UE receives too many repeated NAS messages, the state processing of the UE will be more complicated, and some abnormal situations may also occur, so avoiding receiving repeated NAS messages is also a problem that needs to be solved

[0024] In this way, from the perspective of the EPC, the EPC sent the NAS message, but did not receive the feedback from the UE, which is a loss of the NAS message.

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