Network slice selection in wireless telecommunication networks
A wireless telecommunication system may utilize multiple network slices, each of which may implement a different core network. In order to route initial attach requests to appropriate network slices and corresponding core networks, a mobility management component sends a received initial attach request to a network slice selector. The network slice selector queries a selection policy function to obtain a designation of a particular network slice to which the attach request should be directed. The network slice selector then sends a redirect request to the mobility management component, instructing the mobility management component to resend the attach request to the designated network slice.
1. A wireless telecommunication system comprising:
multiple network slices corresponding respectively to dedicated core networks of the wireless telecommunication system;
a network slice selector;
a slice selection policy function;
a management component that receives network attach requests from wireless communication devices, the management component being configured to send a first create session request to the network slice selector in response to receiving a network attach request from a wireless communication device;
the network slice selector being configured to send a slice request to the slice selection policy function in response to receiving the first create session request;
the slice selection policy function being configured to select one of the multiple network slices based at least in part on one or more policies in response to receiving the slice request;
the slice selection policy function being further configured to specify the selected one of the network slices to the network slice selector; and
the network slice selector being further configured to redirect the first create session request to the selected one of the network slices.
2. The wireless telecommunication system of 1 , wherein the slice selection policy function specifies the selected one of the network slices by specifying a network address of a gateway of the selected one of the network slices.
3. The wireless telecommunication system of 1 , wherein:
the network slice selector redirects the first create session request by sending a redirect response to the management component, the redirect response specifying the selected one of the network slices; and
the management component is further configured to send a second create session request to the selected one of the network slices in response to receiving the redirect response.
4. The wireless telecommunication system of 1 , wherein the management component comprises a mobile management entity (MME) of a long-term evolution (LTE) communication network.
5. The wireless telecommunication system of 1 , wherein the management component comprises a control plane function of a 5th generation (5G) communication network.
6. The wireless telecommunication system of 1 , wherein the slice selection policy function selects the one of the network slices further based at least in part on one or more of:
information regarding services associated respectively with the network slices;
a subscriber profile associated with the wireless communication device; or
congestion of the respective dedicated core networks.
7. A method performed by a wireless telecommunications network having multiple core networks, the method comprising:
receiving a network attach request originating from a wireless communication device;
sending a first create session request to a network selector in response to receiving the network attach request;
selecting, by the network selector, a core network from the multiple core networks based at least in part on which of multiple services is associated with the core network;
sending a redirect response from the network selector in response to the first create session request, the redirect response specifying the core network; and
sending a second create session request to the core network in response to the redirect response.
8. The method of claim 7 , wherein the selecting is further based at least in part on a subscriber profile associated with the wireless communication device.
9. The method of claim 7 , wherein the selecting is further based at least in part on congestion of the core network.
10. The method of claim 7 , wherein the selecting comprises:
sending a selection request to a selection policy function;
receiving a specification of the core network from the selection policy function;
wherein the policy function selects the core network based on one or more of:
which of the multiple services is associated with the core network;
a subscriber profile associated with the wireless communication device; or
congestion of the core network.
11. The method of claim 7 , wherein the redirect response specifies a network address of the core network.
12. The method of claim 7 , wherein:
sending the first create session request is performed by a mobile management entity (MME) of a long-term evolution (LTE) communication network; and
sending the second create session request is performed by the MME of the LTE communication network.
13. The method of claim 7 , wherein:
sending the first create session request is performed by a control plane function of a 5 th generation (5G) communications network; and
sending the second create session request is performed by the control plane function of the 5G communication network.
14. A wireless telecommunication system comprising:
a management component that receives network attach requests from wireless communication devices;
a network selector;
the management component being configured to send a first create session request to the network selector in response to receiving a network attach request from a wireless communication device;
the network selector being configured to select one of multiple core networks of the wireless telecommunication system based at least in part on which of multiple services is associated with said one of the multiple core networks;
the network selector being further configured to redirect the first create session request to said one of the multiple core networks.
15. The wireless telecommunication system of claim 14 , wherein the network selector selects said one of the multiple core networks further based at least in part on a subscriber profile associated with the wireless communication device.
16. The wireless telecommunication system of claim 14 , wherein the network selector selects the one of the multiple core networks further based at least in part on congestion of said one of the multiple core networks.
17. The wireless telecommunication system of claim 14 , further comprising a selection function, wherein the network selector selects said one of the multiple core networks by:
sending a selection request to the selection function;
receiving a specification of said one of the core networks from the selection function;
wherein the selection function selects said one of the core networks based at least in part on one or more of:
which of the multiple services is associated with said one of the core networks;
a subscriber profile associated with the wireless communication device; or
congestion of said one of the core networks.
18. The wireless telecommunication system of claim 14 , wherein the management component comprises a mobile management entity (MME) of a long-term evolution (LTE) communication network.
19. The wireless telecommunication system of claim 14 , wherein the management component comprises a control plane function of a 5th generation (5G) communications network.
20. The wireless telecommunication system of claim 14 , wherein:
the network selector is further configured to redirect the first create session request by sending a redirect response to the management component, the redirect request specifying said one of the multiple core networks; and
the management component is further configured to send a second create session request to said one of the multiple core networks in response to the redirect request.