| 摘要 |
<p>The present invention relates to the field of mobile communications, and provides a service gateway obtaining method and mobile management node, a data gateway and a system. A service gateway obtaining method provided in an embodiment of the present invention comprises: when a UE switches from an old side mobile management node to a new side mobile management node, the new side mobile management node sending a domain name parsing request to a domain name system (DNS) server according to access information of the UE, the access information comprising an access point name (APN) of the UE or an old side location area identifier of the UE; receiving a host name of a device returned by the DNS server according to the domain name parsing request; acquiring a host name of a new side available S-GW; selecting, according to a part representing geographical topology in the host name of the device and a part representing geographical topology in the host name of the new side available S-GW, the new side available S-GW closest to the device on the geographical topology to serve as the new side S-GW. By means of the above method, a transmission delay of user service data caused after a new side mobile management node selects a new side S-GW for a UE is reduced.</p> |
