| 摘要 |
In current 3GPP technology (as defined in 3GPP TS 23.402, "Architecture enhancements for non-3GPP accesses") ANDSF (Access Network Discovery and Selection Function) can provide policies to a mobile terminal (UE) in push or pull mode. The provisioning of offload policies happens via a protocol based on OMA DM (as described in 3GPP TS 24.312, "Access Network Discovery and Selection Function (ANDSF) Management Object (MO)") and is assumed not to be a real-time process. However, there are several use cases where the usage of such policies should be controlled in (nearly) real-time, e.g. in case of overload, a special offload policy for overload need to be activated more or less in real time (ideally within a few seconds) for many users; or for the support of a marketing campaign where offload to non-3GPP access plays a role, real-time activation of offload policies should support this case. The problem with current technology is that (nearly) real-time activation of ANDSF policies is not possible and thus the above mentioned use cases cannot be supported. An ANDSF policy is a set of one or more policy rules, whereby the ANDSF management object according to 3GPP TS 23.312 comprises rules which have a number of validity conditions, e.g. current access technology or location. Hence currently, valid rules can be identified but not active rules. This problem is solved, in that a set of rules being referred to as ANDSF policy set is defined and each is linked with a unique identifier, referred to as ANDSF Set-ID. The different policy sets are provisioned to targeted UEs in non-real time (3), i.e. any set will be provided well before it is to be used by a particular UE. Basically, the provisioning step may be realized based on existing methods, for instance by using a protocol based on OMA DM (as described in 3GPP TS 24.312, "Access Network Discovery and Selection Function (ANDSF) Management Object (MO)") via the S14 interface. The real-time character of the process may be achieved by conveying ANDSF Set-IDs in the 3GPP control plane in real time or quasi real- time (4). The UE then applies the ANDSF policy set according to the received ANDS Set-ID (5). |
