Telecommunications network bearer allocation and deallocation
An access network can allocate a bearer for a network service associated with a quality-of-service (QoS) value (QV) and a retention-priority value (RPV), and determine a bearer ID for the service based on the QV, the RPV, and a supplemental priority value (SPV) different from the QV and from the RPV. Upon handover of a terminal, session(s) carried by a bearer allocated by the terminal can be terminated. That bearer can be selected using IDs of the bearers and a comparison function that, given two bearer IDs, determines which respective bearer should be terminated before the other. Upon handover of a terminal to an access network supporting fewer bearers per terminal than the terminal has allocated, a network node can select a bearer based on respective QVs and RPVs of a set of allocated bearers. The network node can deallocate the selected bearer.
1. A telecommunication device, comprising:
a communications interface;
at least one processor; and
at least one computer-readable medium storing instructions executable by the at least one processor to cause the at least one processor to perform operations comprising:
receiving a request to allocate a bearer for a terminal to receive a network service via a first access network, wherein the network service is associated with a quality-of-service (QoS) value (QV) and a retention-priority value (RPV);
determining a bearer identifier (ID) for the network service based at least in part on the QV, the RPV, and a supplemental priority value (SPV), the SPV comprising at least one member selected from a first group comprising of an APN associated with the service; a priority flag; an identification of a subscriber associated with the terminal; a type of the terminal; an equipment identifier of the terminal; a network address allocated to the terminal; a Multimedia Priority Services (MPS) indication; and a Mission-Critical Services (MCS) indication; and
sending a reply comprising the bearer identifier via the communications interface;
wherein:
the SPV is different from the QV, and
the SPV is different from the RPV.
2. The telecommunication device according to claim 1 , the operations further comprising:
triggering a handover of the terminal from a first access network supporting a first number of bearers to a second access network supporting a second, lower number of bearers.
3. The telecommunication device according to claim 1 , the operations further comprising determining the SPV based at least in part on an access point name (APN) associated with the service.
4. The telecommunication device according to claim 1 , wherein:
the operations further comprise determining the bearer ID based at least in part on a second SPV selected from the first group;
the second SPV is different from the SPV;
the second SPV is different from the QV;
the second SPV is different from the RPV; and
the operations further comprise weighting the SPV more highly than the second SPV in determining the bearer ID.
5. A method comprising, by a control unit of a network node, performing operations comprising:
determining that a terminal is being handed over from a first access network to a second access network, wherein the second access network supports a predetermined number of bearers per network terminal;
determining that the terminal has allocated a set of bearers comprising more bearers than the predetermined number;
selecting a first bearer of the set of bearers based at least in part on:
respective quality-of-service (QoS) values (QVs) of at least some bearers of the set of bearers; and
respective retention-priority values (RPVs) of at least some bearers of the set of bearers; and
deallocating the first bearer by:
determining that a second bearer of the second access network is unallocated; and
moving session(s) being carried by the first bearer to the second bearer.
6. The method according to claim 5 , the operations comprising deallocating the first bearer at least partly by terminating session(s) being carried by the first bearer.
7. The method according to claim 5 , the operations comprising selecting the first bearer further based at least in part on respective supplemental priority values (SPVs) of at least some bearers of the set of bearers.
8. The method according to claim 7 , the operations comprising retrieving at least one of the respective SPVs from a configuration network node.
9. The method according to claim 7 , the operations comprising:
determining that a first candidate bearer of the set of bearers has a first QV, a first RPV, and a first SPV;
determining that a second candidate bearer of the set of bearers has the first QV, the first RPV, and a second SPV different from the first SPV; and
selecting, as the first bearer, one of the first candidate bearer and the second candidate bearer based at least in part on:
the first SPV;
the second SPV; and
a predetermined comparison function that, given two SPVs, determines which of the respective bearers is to be selected before the other.
10. The method according to claim 7 , further comprising determining at least one of the respective SPVs based at least in part on an access point name (APN) associated with a network service being carried by the respective bearer.
11. The method according to claim 7 , wherein the SPV comprises at least one member selected from a first group consisting of: an APN associated with the service; a priority flag; an identification of a subscriber associated with the terminal; a type of the terminal; an equipment identifier of the terminal; a network address allocated to the terminal; a Multimedia Priority Services (MPS) indication; and a Mission-Critical Services (MCS) indication.
12. The method according to claim 5 , wherein the network node comprises at least one of: a 3GPP Long-Term Evolution (LTE) eNodeB, an LTE mobility management entity (MME), an LTE packet data network gateway (PGW), or an LTE policy charging and rules function (PCRF).
13. The method according to claim 5 , wherein the first bearer comprises an LTE data radio bearer (DRB).
14. A computing device comprising:
at least one processor; and
at least one computer-readable medium storing instructions executable by the at least one processor to cause the at least one processor to perform operations comprising:
determining that a terminal is being handed over from a first access network to a second access network, wherein the second access network supports a predetermined number of bearers per network terminal;
determining that the terminal has allocated a set of bearers comprising more bearers than the predetermined number;
selecting a first bearer of the set of bearers based at least in part on one or more metrics of at least some bearers of the set of bearers; and
deallocating the first bearer by:
determining that a second bearer of the second access network is unallocated; and
moving session(s) being carried by the first bearer to the second bearer.
15. The computing device according to claim 14 , the operations comprising deallocating the first bearer at least partly by terminating session(s) being carried by the first bearer.
16. The computing device according to claim 14 , the operations comprising selecting the first bearer further based at least in part on respective supplemental priority values (SPVs) of at least some bearers of the set of bearers.
17. The computing device according to claim 16 , the operations comprising retrieving at least one of the respective SPVs from a configuration network node.
18. The computing device according to claim 16 , the operations comprising:
determining that a first candidate bearer of the set of bearers has a first QV, a first RPV, and a first SPV;
determining that a second candidate bearer of the set of bearers has the first QV, the first RPV, and a second SPV different from the first SPV; and
selecting, as the first bearer, one of the first candidate bearer and the second candidate bearer based at least in part on:
the first SPV;
the second SPV; and
a predetermined comparison function that, given two SPVs, determines which of the respective bearers is to be selected before the other.
19. The computing device according to claim 16 , further comprising determining at least one of the respective SPVs based at least in part on an access point name (APN) associated with a network service being carried by the respective bearer.
20. The computing device according to claim 16 , wherein the SPV comprises at least one member selected from a first group consisting of: an APN associated with the service; a priority flag; an identification of a subscriber associated with the terminal; a type of the terminal; an equipment identifier of the terminal; a network address allocated to the terminal; a Multimedia Priority Services (MPS) indication; and a Mission-Critical Services (MCS) indication.