Mobile communication method, mobile management node, and serving gateway apparatus
A mobile communication method according to the present invention includes the steps of: starting, by a UE, re-attach processing for MME# 2 , upon receiving “Paging”; transmitting, by MME# 1 , “DDN Ack” including “EPS Bearer ID# 1 ” included in “DDN” and “Cause=Re-Attach Success” (information indicating that re-attach processing is successful), to S-GW# 1 specified by S-GW address # 1 included in the “DDN”; and releasing, by S-GW# 1 , a PDN connection # 1 between S-GW# 1 and P-GW# 1 , upon receiving the “DDN Ack”, the PDN connection # 1 corresponding to the “EPS Bearer ID# 1 ” included in the “DDN Ack”.
1. A mobile communication method in a mobile communication system, the method comprising:
performing, by a mobility management node, a restart;
maintaining, by a serving gateway (SGW), some specific bearers between said SGW and a packet data network gateway (PGW);
sending, by said SGW, Downlink Data Notification message to said mobility management node for paging a mobile terminal (UE); and
requesting, by said mobility management node, said SGW to release said maintained bearer by sending a Downlink Data Notification Acknowledge message which includes a cause that said mobile terminal has re-attached.
2. A mobile communication system, the system comprising:
a serving gateway (SGW) that is configured to maintain some specific bearers between said SGW and a packet data network gateway (PGW) if a mobility management node has restarted and send a Downlink Data Notification message to said mobility management node for paging a mobile terminal (UE); and
said mobility management node that is configured to request said SGW to release said maintained bearers by sending a Downlink Data Notification Acknowledge message which includes a cause that said mobile terminal has re-attached.
3. The mobile communication method according to claim 1 , wherein said Downlink Data Notification Acknowledge message includes an IMSI (International Mobile Subscriber Identity) to identify the UE in the SGW.
4. The mobile communication method according to claim 2 , wherein said Downlink Data Notification Acknowledge message includes an IMSI (International Mobile Subscriber Identity) to identify the UE in the SGW.