PCRF
* LTE PCC = PCRF (PDP Policy Decision Point) + PCEF + OCS + OFCS
* 4G PCRF = 3G PDF + 3G CRF
- allow/reject media req
- new / existing pdp context for media
- check against max allowed resource allocation
- lower BW for heavy-bw apps, during peak hours
Policies
- QoS
- BW Control
- Subscriber-aware
- Application gating
CRF
- charging rules: based on: Customer Service Level Agreement, time of day, n/w condition, volume of usage of high BW application, QoS gurantees, roaming status.
PCRF
(1) service flow detection
(2) Policy enforcement - PDF
(3) flow based charging - CRF
- real time management of (1) n/w and (2) subscribe policy
- route and prioritize n/w traffic.
- subscriber context = device + network + location + billing data
- input for revenue assurance +
- bw management: real time appropriate bw allocation to each service
- charging rules
In PCRF:
Memory = Subscriber DB
DSC (Diameter Signalling Controller) = nervous system
Brain = policy
Interfaces
Gx: PCEF (P-GW)
Gxx: BBERF (S-GW)
Rx: AS
Sp: SPR
Sd: TDF Traffic Detection Function
Sy: OCS
Gz: PCEF - OFCS
Gy: PCEF - OCS
Ud: UDR User Data Repository
Ref:
