Network slice information for handover procedure
A first base station receives from a core network entity, a first message indicating a request for a session resource for a wireless device. The session resource is associated with a first network slice. The first base station sends to a second base station, a second message indicating a handover request for the wireless device towards a first cell of the second base station. The first message comprises: a packet flow identifier of a packet flow associated with the first network slice; a network slice identifier of the first network slice; and a cause information element indicating that the handover request is to provide at least one network slice for the wireless device. The at least one network slice comprises the first network slice. The first base station receives from the second base station, a third message indicates an acceptance or a rejection based on the second message.
1. A method comprising:
receiving, by a first base station from a core network entity, a first message indicating a request for session resources for a wireless device, wherein the session resources are for a first network slice;
initiating, by the first base station and based on the requested session resources for the first network slice not being available for the wireless device at the first base station, a handover for the wireless device towards a first cell of a second base station;
sending, to the second base station and based on the initiating, a second message indicating a handover request, the second message comprising:
a packet flow identifier of a packet flow associated with the first network slice;
a network slice identifier of the first network slice for the handover request; and
a cause information element indicating that a cause for the handover request is that the requested session resources are not available, at the first base station, for the first network slice identified by the network slice identifier; and
receiving, from the second base station, a third message indicating an acceptance or a rejection based on the second message.
2. The method of claim 1 , wherein the second base station determines the acceptance or the rejection based on at least one of:
the cause information element; or
a traffic load status of one or more cells of the second base station for the first network slice, the one or more cells comprising the first cell.
3. The method of claim 1 , wherein the second message further comprises:
a wireless device identifier of the wireless device; and
a cell identifier of the first cell.
4. The method of claim 1 , wherein the third message further comprises a rejection cause for rejecting at least one of the handover request or the packet flow associated with the first network slice, the rejection cause indicating that the first network slice is not supported by at least one of:
the first cell; or
the second base station.
5. The method of claim 1 , wherein the third message further comprises at least one of:
an admitted packet flow identifier of an admitted packet flow; or
a non-admitted packet flow identifier of a non-admitted packet flow.
6. The method of claim 1 , wherein the network slice identifier comprises at least one of:
a network slice selection assistance information; or
a single network slice selection assistance information.
7. The method of claim 1 , wherein the core network entity sends the first message based on a session creation request from the wireless device, the session creation request associated with the first network slice.
8. A first base station comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the first base station to:
receive, from a core network entity, a first message indicating a request for session resources for a wireless device, wherein the session resources are for a first network slice;
initiate, based on the requested session resources for the first network slice not being available for the wireless device at the first base station, a handover for the wireless device towards a first cell of a second base station;
send, to the second base station and based on the initiating, a second message indicating a handover request, the second message comprising:
a packet flow identifier of a packet flow associated with the first network slice;
a network slice identifier of the first network slice for the handover request; and
a cause information element indicating that a cause for the handover request is that the requested session resources are not available, at the first base station, for the first network slice identified by the network slice identifier; and
receive, from the second base station, a third message indicating an acceptance or a rejection based on the second message.
9. The first base station of claim 8 , wherein the second base station determines the acceptance or the rejection based on at least one of:
the cause information element; or
a traffic load status of one or more cells of the second base station for the first network slice, the one or more cells comprising the first cell.
10. The first base station of claim 8 , wherein the second message further comprises:
a wireless device identifier of the wireless device; and
a cell identifier of the first cell.
11. The first base station of claim 8 , wherein the third message further comprises a rejection cause for rejecting at least one of the handover request or the packet flow associated with the first network slice, the rejection cause indicating that the first network slice is not supported by at least one of:
the first cell; or
the second base station.
12. The first base station of claim 8 , wherein the third message further comprises at least one of:
an admitted packet flow identifier of an admitted packet flow; or
a non-admitted packet flow identifier of a non-admitted packet flow.
13. The first base station of claim 8 , wherein the network slice identifier comprises at least one of:
a network slice selection assistance information; or
a single network slice selection assistance information.
14. The first base station of claim 8 , wherein the core network entity sends the first message based on a session creation request from the wireless device, the session creation request associated with the first network slice.
15. A method comprising:
receiving, by a first base station from a second base station, a first message indicating a handover request based on requested session resources for a first network slice not being available for a wireless device at the first base station, the first message comprising:
a packet flow identifier of a packet flow associated with a first network slice of a plurality of network slices;
a network slice identifier of the first network slice for the handover request; and
a cause information element indicating that a cause for the handover request is that the requested session resources are not available, at the first base station, for the first network slice identified by the network slice identifier; and
sending, to the second base station, a second message indicating an acceptance or a rejection based on the first message.
16. The method of claim 15 , wherein the first base station determines the acceptance or the rejection based on at least one of:
the cause information element; or
a traffic load status of one or more cells of the first base station for the first network slice, the one or more cells comprising a first cell.
17. The method of claim 15 , wherein the first message further comprises:
a wireless device identifier of the wireless device; and
a cell identifier of a first cell.
18. The method of claim 15 , wherein the second message further comprises a rejection cause for rejecting at least one of the handover request or the packet flow associated with the first network slice, the rejection cause indicating that the first network slice is not supported by at least one of:
a first cell; or
the first base station.
19. The method of claim 15 , wherein the second message further comprises at least one of:
an admitted packet flow identifier of an admitted packet flow; or
a non-admitted packet flow identifier of a non-admitted packet flow.
20. The method of claim 15 , wherein the network slice identifier comprises at least one of:
a network slice selection assistance information; or
a single network slice selection assistance information.