Method and device for accessing UE (User Equipment) to core network EPC (Evolved Packet Core) in LTE (Long Term Evolvement) system

Abstract

The embodiment of the invention provides a method for accessing UE (User Equipment) to a core network EPC (Evolved Packet Core) in an LTE (Long Term Evolvement) system. The method comprises the steps that a mobility management entity (MME) receives a non access stratum (NAS) service request message sent by the UE and performs integrity protection check on the message; the MME performs authentication on the UE when the integrity protection check fails; the MME sends a security context establishment request to a base station ENB (Evolved NodeB) after the UE passes authentication; the MME sends a bearer modification request to a serving gateway (SGW) when a security context establishment response returned by the base station ENB in allusion to the security context establishment request is received; the MME receives a bearer modification response returned by the SGW after bearer modification; and the UE accesses to the core network EPC according to the bearer modification response. According to the invention, the UE is enabled to access to the network again through a mode of re-establishing a context between the UE which fails in integrity protection and sends the NAS service request and the MME.

Description

technical field [0001] The present application relates to the technical field of mobile communication, and in particular to a method for UE in LTE system to access core network EPC and a device for UE in LTE system to access core network EPC. Background technique [0002] refer to figure 1 It is a non-roaming access framework for 3GPP access. Under the LTE (Long Term Evolvement, Long Term Evolution) network architecture, the wireless communication system consists of a radio access network and a core network. The radio access network is realized by ENB (Evolved NodeB, evolved NodeB base station), and the core network is realized by EPC. EPC (Evolved Packet Core, packet core evolution) is realized by MME (Mobility Management Entity, mobility management entity equipment), SGW (ServingGateWay, serving gateway equipment), and PGW (PDN GateWay, PDN gateway equipment). As the mobility management entity of the core network, the MME device plays a very important role. [0003] Und...

AI Technical Summary

Problems solved by technology

In the large-scale test of LTE network construction, after receiving the Service Reject message from the MME, the UE immediately sends a Service Request message to the MME. After receiving the message, the MME fails to verify the integrity of the message, and then replies to the UE with a Service Reject message. , after the UE receives the rejection message, it immediately initiates a Service Request request message, which goes back and forth in this way, causing the UE to always be unable to access

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