OpenAirInterface Core PDN Gateway Feature Set¶

1. PGW Fundamentals¶

The Packet Data Network Gateway provides connectivity from the UE to external packet data networks by being the point of exit and entry of traffic for the UE.

A UE may have simultaneous connectivity with more than one PGW for accessing multiple PDNs.

The PGW performs:

Policy enforcement,
Packet filtering for each user,
Charging support,
Lawful interception and
Packet screening.

Another key role of the PGW is to act as the anchor for mobility between 3GPP and non-3GPP technologies such as WiMAX and 3GPP2 (CDMA 1X and EvDO).

2. OAI PGW Available Interfaces¶

ID	Interface	Status	Comments	Protocols
1	S5 / S8	✅	Available on control plane only.	GTP-based
2	Gx	❌	Policy
3	Gy	❌	Charging
4	N6	✅

3. OAI PGW Conformance Functions¶

Based on document 3GPP TS 23.401 V15.5.0 §4.4.3.3.

ID	Classification	Status	Comments
1	Per-user based packet filtering (ie deep packet inspection)	✅
2	Lawful Interception	❌
3	UE IP address allocation	✅	Pools of IP addresses
4	Transport level packet marking in the uplink and downlink	❌
5	Accounting for inter-operator charging	❌
6	UL and DL service level charging as defined in TS 23.203	❌
7	Interfacing OFCS through	❌
8	UL and DL service level gating control	❌
9	UL and DL service level rate enforcement	❌
10	UL and DL rate enforcement based on APN-AMBR	❌
11	DL rate enforcement based on the accumulated MBRs of the aggregate of SDFs with the same GBR QCI	❌
12	DHCPv4 (server and client) and DHCPv6 (client and server)	❌
13	The network does not support PPP bearer type	❌
14	The PDN GW may support Non-IP data transfer	❌
15	Packet screening	❌
16	Sending of one or more “end marker(s)” to the source SGW immediately after switching the path during SGW change	❌
17	PCC related features (e.g. involving PCRF and OCS)	❌
18	UL and DL bearer binding as defined in TS 23.203	❌
19	UL bearer binding verification as defined in TS 23.203	❌
20	Functionality as defined in RFC 4861	❌
21	Accounting per UE and bearer	❌