Inactive state data forwarding
View Patent ↗A base station receives from a first core network entity, packet(s) for a wireless device in an RRC inactive state. The base station initiates a RAN paging procedure comprising sending RAN paging message(s) to second base station(s). The RAN paging message(s) comprises a first identifier of the wireless device. The base station determines a failure of the RAN paging procedure in response to not receiving a response of the RAN paging message(s). The base station sends a first message to a second core network entity in response to the failure of the RAN paging procedure. The base station receives a second message from the second core network entity in response to the first message. The second message comprises a tunnel endpoint identifier of a third base station for forwarding the packet(s). The base station sends to the third base station, the packet(s) based on the tunnel endpoint identifier.
1. A method comprising:
receiving, by a first base station from a first core network entity, one or more packets for a wireless device in a radio resource control (RRC) inactive state;
initiating, by the first base station, a radio access network (RAN) paging procedure comprising sending at least one RAN paging message to at least one second base station, wherein the at least one RAN paging message comprises a first identifier of the wireless device;
determining, by the first base station, a failure of the RAN paging procedure in response to not receiving a response of the at least one RAN paging message;
sending, by the first base station to a second core network entity and in response to the failure of the RAN paging procedure, a first message;
receiving, by the first base station from the second core network entity and in response to the first message, a second message comprising a tunnel endpoint identifier of a third base station for forwarding the one or more packets; and
sending, by the first base station to the third base station, the one or more packets based on the tunnel endpoint identifier.
2. The method of claim 1 , further comprising:
initiating, by the second core network entity and in response to receiving the first message, a core network paging procedure comprising sending a first paging message to the third base station, wherein the first paging message comprises a second identifier of the wireless device; and
receiving, by the second core network entity from the third base station, a third message in response to the first paging message, wherein the third message comprises the tunnel endpoint identifier of the third base station.
3. The method of claim 1 , wherein:
the first core network entity comprises a control plane core network node; and
the second core network entity comprises a user plane core network node.
4. The method of claim 1 , wherein the sending of the one or more packets is via a direct tunnel between the first base station and the third base station, the direct tunnel associated with the tunnel endpoint identifier.
5. The method of claim 1 , wherein the tunnel endpoint identifier comprises an internet protocol (IP) address of the third base station.
6. The method of claim 1 , wherein the first message indicates the failure of the RAN paging procedure.
7. The method of claim 1 , wherein the at least one RAN paging message comprises at least one of:
a RAN notification information;
a context identifier of the wireless device; or
a reason of initiating the RAN paging procedure.
8. The method of claim 1 , wherein the at least one second base station transmits a second RAN paging message via a radio interface in response to receiving the at least one RAN paging message.
9. A base station comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the base station to:
receive, from a first core network entity, one or more packets for a wireless device in a radio resource control (RRC) inactive state;
initiate a radio access network (RAN) paging procedure comprising sending at least one RAN paging message to at least one second base station, wherein the at least one RAN paging message comprises a first identifier of the wireless device;
determine a failure of the RAN paging procedure in response to not receiving a response of the at least one RAN paging message;
send, to a second core network entity and in response to the failure of the RAN paging procedure, a first message;
receive, from the second core network entity and in response to the first message, a second message comprising a tunnel endpoint identifier of a third base station for forwarding the one or more packets; and
send, to the third base station, the one or more packets based on the tunnel endpoint identifier.
10. The base station of claim 9 , wherein:
the first core network entity comprises a control plane core network node; and
the second core network entity comprises a user plane core network node.
11. The base station of claim 9 , wherein the sending of the one or more packets is via a direct tunnel between the base station and the third base station, the direct tunnel associated with the tunnel endpoint identifier.
12. The base station of claim 9 , wherein the tunnel endpoint identifier comprises an internet protocol (IP) address of the third base station.
13. The base station of claim 9 , wherein the first message indicates the failure of the RAN paging procedure.
14. The base station of claim 9 , wherein the at least one RAN paging message comprises at least one of:
a RAN notification information;
a context identifier of the wireless device; or
a reason of initiating the RAN paging procedure.
15. The base station of claim 9 , wherein the at least one second base station transmits a second RAN paging message via a radio interface in response to receiving the at least one RAN paging message.
16. The base station of claim 9 , wherein the second core network entity:
initiate, in response to receiving the first message, a core network paging procedure comprising sending a first paging message to the third base station, wherein the first paging message comprises a second identifier of the wireless device; and
receive, from the third base station, a third message in response to the first paging message, wherein the third message comprises the tunnel endpoint identifier of the third base station.