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 the IMSI of the UE, which is included in the “DDN”, and “Cause=Re-Attach Success”, 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 IMSI of the UE included in the “DDN Ack”.
1. A mobile terminal for performing communication with a core network including a mobility management node and a SGW (Serving Gateway), the mobile terminal comprising:
a receiver that receives a paging by the mobility management node which releases, on reception of a DDN (Downlink Data Notification) from the SGW maintaining a bearer between the SGW and a PGW (Packet Data Network Gateway), the bearer by sending a DDN Acknowledge, which includes a cause that the mobile terminal has re-attached, to the SGW, wherein the DDN includes IMSI (International Mobile Subscriber Identity) to identify the mobile terminal; and
a transmitter that transmits an Attach Request to the core network to start a re-attach procedure upon receipt of the paging.
2. The mobile terminal according to claim 1 , wherein
the transmitter transmits the Attach Request to said or another mobility management node in the core network.
3. The mobile terminal according to claim 1 , wherein
the receiver receives the paging on the basis of the IMSI.
4. The mobile terminal according to claim 2 , wherein
in a case where the receiver receives the paging on the basis of SAE (System Architecture Evolution) Temporary Mobile Station Identifier (S-TMSI) allocated to the mobile terminal, the transmitter transmits a Service Request to the mobility management node before transmitting the Attach Request.
5. A communication method of a mobile terminal that performs communication with a core network including a mobility management node and a SGW (Serving Gateway), the communication method comprising:
receiving a paging by the mobility management node which releases, upon reception of a DDN (Downlink Data Notification) from the SGW maintaining a bearer between the SGW and a PGW (Packet Data Network Gateway), the bearer by sending a DDN Acknowledge, which includes a cause that the mobile terminal has re-attached, to the SGW, wherein the DDN includes IMSI (International Mobile Subscriber Identity) to identify the mobile terminal; and
transmitting an Attach Request to the core network to start a re-attach procedure upon receipt of the paging.
6. The communication method according to claim 5 , wherein
the mobile terminal transmits the Attach Request to said or another mobility management node in the core network.
7. The communication method according to claim 5 , wherein
the mobile terminal receives the paging on the basis of the IMSI.
8. The communication method according to claim 6 , further comprising:
on receipt of the paging on the basis of SAE (System Architecture Evolution) Temporary Mobile Station Identifier (S-TMSI) allocated to the mobile terminal, transmitting a Service Request to the mobility management node before transmitting the Attach Request.