Method and system for reserving packet data gateway address information

Abstract

The invention discloses a method for reserving address information of a packet data network gateway (PDN GW), comprising the steps: a user-signed server reserves the address information of the dynamic PDN GW used by a user terminal clear of attachment according to a request message for clearing the user terminal sent by a clear operation initiating end; and a clearing mark is set and an acknowledgment message for clearing the user terminal is returned to the clear operation initiating end. The invention also discloses a system for reserving the address information of the PDN GW simultaneously, and the system comprises the clear operation initiating end and the user-signed server. The method and the system for reserving the address information of the PDN GW do not delete the address information of the PDN GW used by the UE clear of attachment in a 3GPP access system or do not mark the address information of the PDN GW to be invalid, therefore, the UE can be continued to be accessed to a network according to the reserved address information of the PDN GW when being switched in a non-3GPP access system or switched from the non-3GPP access system back to the 3GPP access system, thus ensuring the continuity of businesses of the UE when being used among different networks. Simultaneously, the invention has simple realization.

Description

A method and system for retaining packet data network gateway address information technical field The invention relates to mobile communication technology, in particular to a method and system for retaining address information of a packet data network gateway. Background technique At present, with the development of communication technology, the third generation mobile communication technology has become increasingly mature. The Universal Mobile Telecommunications System (UTMS) is a third-generation mobile communication system that uses Wideband Code Division Multiple Access (WCDMA) air interface technology. The system adopts a structure similar to that of the second-generation mobile communication system. However, considering the competitiveness of future networks, 3GPP proposed a newer evolved network architecture to meet the application requirements of mobile networks in the next ten years or longer, and this evolved network can ensure that 3G networks can be transforme...

AI Technical Summary

Problems solved by technology

When the HSS / HLR clears the PDNGW address information used by the UE, the UE is now in an unreachable state for the HSS / HLR. Since the PDNGW is the anchor point of the user plane, it remains unreachable during the UE session period. Therefore, when the PDNGW address information is deleted or the identity is invalid, if the UE enters the non-3GPP access system from the 3GPP access system and performs handover in the non-3GPP access system, the target authentication in the non-3GPP access system The authorization and accounting server (AAAServer) needs to query the HSS / HLR for the PDNGW address information used by the UE, but because the address information has been deleted or the identification is invalid, the HSS / HLR cannot use the PDNGW address for the UE The information is transmitted to the AAAServer, causing the UE to fail to access the network, so that the handover of the UE in the non-3GPP access system fails

Similarly, when the UE is switched back to the 3GPP access system from a non-3GPP access system, because the address information has been deleted or the identification is invalid, the UE is marked as unreachable in the HSS / HLR, and the HSS / HLR cannot The PDNGW address information used by the UE is passed to the target MME or target SGSN in the 3GPP access system, resulting in the UE being unable to access the network and also causing handover failure

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