Mobile communication method and exchange

摘要

The present invention is designed such that a new SGSN receives a location update message from a terminal (1) having moved from the management area of an old SGSN to the management area of the new SGSN, and the new SGSN having received the location update message sends a GTPv2 signal for getting communication path information corresponding to GTPv2, to the old SGSN. The old SGSN, upon receiving the GTPv2 signal, if holding communication path information of to GTPv1 as a logical communication path established for the terminal (1), sends, as a response, a GTPv2 signal in which the communication path information by GTPv1 is set in an additional parameter 24, to the new SGSN.

主权项

1. A mobile communication method comprising the steps of:
receiving, from a terminal having moved from a management area of a first node to a management area of a second node, a location update message at the second node, wherein the first node is able to support both GTPv1 (GTP protocol, version 1) and GTPv2 (GTP protocol, version 2 and the first node is able to establish both a GPRS (general packet radio service) bearer with a GGSN (gateway GPRS support node) and an EPS (evolved packet system) bearer with an S-GW (serving gateway); sending, from the second node having received the location update message to the first node, a GTPv2 signal for getting bearer information; notifying, from the first node to the second node, an error for causing a fallback to the GTPv1 by the GTPv2 signal, when the first node establishes the GPRS bearer with the GGSN as a bearer for the terminal; and changing a protocol type to the GTPv1, at the second node to which the error has been notified from the first node by the GTPv2 signal, and sending again a protocol signal for getting bearer information to the first node by the changed protocol type.