CISCO-EPC-GATEWAY-MIB

All MIBs › CISCO-EPC-GATEWAY-MIB

Organization: Cisco Systems, Inc.

Last Updated: 2012-02-08

Category: Cisco Devices, Mobile IP, Telephony and VoIP

Description: Provides management objects for monitoring and configuring the Cisco Evolved Packet Core (EPC) gateway in LTE mobile networks.

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What Is CISCO-EPC-GATEWAY-MIB?

CISCO-EPC-GATEWAY-MIB is a Cisco-specific MIB for the Evolved Packet Core (EPC) mobile network architecture, covering the PDN Gateway (PGW) and Serving Gateway (SGW) functions used in LTE networks. It exposes congestion-control statistics, buffer-management counters, and notification objects related to GTP tunnel and packet-flow processing on the gateway. The MIB is aimed at monitoring software/system health under load: it surfaces congestion threshold crossings, dropped incoming requests due to congestion, and detailed buffer lifecycle counters (created, deleted, timed out, enqueued/dequeued packets and bytes, rejections due to memory shortage) that reveal resource exhaustion or performance degradation on the gateway. As an EPC-specific MIB it is closely tied to 3GPP mobile-core concepts (GTP, S5/S1-U interfaces) and complements other Cisco mobility MIBs covering GTP and session state. The CISCO-EPC-GATEWAY-MIB MIB is deployed on Cisco ASR/StarOS-based platforms functioning as PGW/SGW nodes in mobile operator core networks, where telemetry on congestion and buffer health is critical to subscriber data-plane performance.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-EPC-GATEWAY-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

Cisco ASR/StarOS-based PDN Gateway (PGW) / Serving Gateway (SGW) platforms (LTE Evolved Packet Core)

Monitoring Examples

An operator's NMS would poll cegCongestionHighThresholdReached and cegCongestionLowThresholdReached to detect when the gateway enters or exits a congestion state, correlating spikes with cegCongestionIncomingReqDrops to quantify dropped session requests. Tracking cegBufferRejMemUnavailable and cegBufferRejLowMem against cegBuffersCreated/cegBuffersDeleted would reveal memory pressure causing buffer allocation failures before it escalates to dropped subscriber traffic. Comparing cegBufferPacketsEnqueued/cegBufferPacketsDequeued and the corresponding byte counters over time helps identify a backed-up queue indicative of a downstream bottleneck.

What Can Be Monitored

congestion threshold state (low/high)
dropped incoming requests due to congestion
buffer creation/deletion counts
buffer timeouts
enqueued/dequeued packets and bytes
buffer allocation rejections due to memory shortage

Imported Objects

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From SNMP-FRAMEWORK-MIB

SnmpAdminString

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Gauge32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

TimeInterval
TimeStamp
TruthValue

How to Use in IPNetwork Monitor

Example using cegCongestionIncomingReqDrops OID:

Select a Cisco ASR/StarOS gateway platform as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type cegCongestionIncomingReqDrops into the Find box to locate it in the OID tree, then select it and click OK. This object represents the total number of incoming calls dropped at the gateway. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases between polls, since a rising count of errors, failures, or discards often points to a real underlying problem. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
G32 cegActivatedBearers	1.3.6.1.4.1.9.9.731.1.3.14	Gauge32	read-only	This object represents the total number of default and dedicated bearers currently active in the Gateway.
G32 cegActivatedDedicatedBearers	1.3.6.1.4.1.9.9.731.1.3.15	Gauge32	read-only	This object represents the total number of dedicated bearers currently active in the Gateway.
G32 cegActivatedGtpv2PgwSessions	1.3.6.1.4.1.9.9.731.1.3.12	Gauge32	read-only	This object represents the total number of activated GTPV2 sessions in PGW mode.
G32 cegActivatedGtpv2SgwSessions	1.3.6.1.4.1.9.9.731.1.3.11	Gauge32	read-only	This object represents the total number of activated GTPV2 sessions in SGW mode.
G32 cegActivatedGtpv2SPgwSessions	1.3.6.1.4.1.9.9.731.1.3.13	Gauge32	read-only	This object represents the total number of activated GTPV2 sessions in SP GW mode.
G32 cegActivatedIpv4Bearers	1.3.6.1.4.1.9.9.731.1.3.2	Gauge32	read-only	This object represents the total activated IPv4 GTPv2 bearers.
G32 cegActivatedIpv4DedicatedBearers	1.3.6.1.4.1.9.9.731.1.3.16	Gauge32	read-only	This object represents the total number of IPv4 dedicated bearers currently active in the Gateway.
G32 cegActivatedIpv4v6Bearers	1.3.6.1.4.1.9.9.731.1.3.10	Gauge32	read-only	This object represents the total number of activated IPv4v6 bearers.
G32 cegActivatedIpv4v6Sessions	1.3.6.1.4.1.9.9.731.1.3.7	Gauge32	read-only	This object represents the total number of activated IPv4v6 sessions.
G32 cegActivatedIpv6Bearers	1.3.6.1.4.1.9.9.731.1.3.3	Gauge32	read-only	This object represents the total activated IPv6 GTPv2 bearers.
G32 cegActivatedIpv6DedicatedBearers	1.3.6.1.4.1.9.9.731.1.3.17	Gauge32	read-only	This object represents the total number of IPv6 dedicated bearers currently active in the Gateway.
C32 cegBufferBytesDequeued	1.3.6.1.4.1.9.9.731.1.1.2.7	Counter32	read-only	This object represents the total bytes of data dequeued from the buffering agent.
C32 cegBufferBytesEnqueued	1.3.6.1.4.1.9.9.731.1.1.2.6	Counter32	read-only	This object represents the total bytes of data enqueued to the buffering agent.
U32 cegBufferDiscardDataTime	1.3.6.1.4.1.9.9.731.1.2.2.3	Unsigned32	read-write	This object specifies the duration for which the buffering agent waits before discarding a buffer. The discard timer begins when a packet is enqueued in the allocated buffer for a bearer. Whenever a packet is enqueued for a bearer, the discard timer is reset. If the timer expires, then the buffer is freed.
cegBufferingAgentConfig	1.3.6.1.4.1.9.9.731.1.2.2
cegBufferingAgentConfigGrp	1.3.6.1.4.1.9.9.731.3.2.5			This group has a collection of objects which configures the buffering agent.
T/F cegBufferingAgentEnabled	1.3.6.1.4.1.9.9.731.1.2.2.1	TruthValue	read-write	This object specifies the state of the buffering agent. 'true' - indicates that the buffering agent is enabled. 'false' - indicates that the buffering agent is disabled.
cegBufferingAgentStatsGrp	1.3.6.1.4.1.9.9.731.3.2.3			This group has a collection of objects to provide the buffering agent statistics.
cegBufferingAgentStatsGrpSup1	1.3.6.1.4.1.9.9.731.3.2.13			This group has a collection of objects to provide the buffering agent statistics related to packet drops based on max limit.
cegBufferingAgentStatusGrp	1.3.6.1.4.1.9.9.731.3.2.6			This group has a collection of objects to provide the buffering agent status.
U32 cegBufferMaxPacketsPerBuffer	1.3.6.1.4.1.9.9.731.1.2.2.4	Unsigned32	read-write	This object specifies the maximum number of packets allowed per buffer in buffering agent. Any new incoming packet after this value has reached its maximum will be dropped.
U32 cegBufferMaxSize	1.3.6.1.4.1.9.9.731.1.2.2.2	Unsigned32	read-write	This object represents the maximum size of a buffer that can be allocated for a bearer. This object is directly dependent on object cegBufferingAgentEnabled and is applicable only when buffering agent is enabled, that is when cegBufferingAgentEnabled is 'true'.
C32 cegBufferPacketsDequeued	1.3.6.1.4.1.9.9.731.1.1.2.5	Counter32	read-only	This object represents the total number of packets dequeued from the buffering agent.
C32 cegBufferPacketsEnqueued	1.3.6.1.4.1.9.9.731.1.1.2.4	Counter32	read-only	This object represents the total number of packets enqueued to the buffering agent.
C32 cegBufferRejLowMem	1.3.6.1.4.1.9.9.731.1.1.2.9	Counter32	read-only	This object represents the total number of times, buffer allocation is rejected due to, low memory availability in the gateway.
C32 cegBufferRejMemUnavailable	1.3.6.1.4.1.9.9.731.1.1.2.8	Counter32	read-only	This object represents the total number of times, buffer allocation is rejected by gateway due to, requested memory is greater than cegTotalBufferAvailable.
C32 cegBuffersCreated	1.3.6.1.4.1.9.9.731.1.1.2.1	Counter32	read-only	This object represents the total number of buffers allocated by buffering agent.
C32 cegBuffersDeleted	1.3.6.1.4.1.9.9.731.1.1.2.2	Counter32	read-only	This object represents the total number of buffers deallocated by buffering agent.
cegBufferStats	1.3.6.1.4.1.9.9.731.1.1.2
cegBufferStatus	1.3.6.1.4.1.9.9.731.1.3.9
C32 cegBuffersTimedOut	1.3.6.1.4.1.9.9.731.1.1.2.3	Counter32	read-only	This object represents the total number of buffers that got timed out, at buffering agent. A buffer is timed out when the discard timer cegBufferDiscardDataTime expires.
NTF cegCongestionClearedNotif	1.3.6.1.4.1.9.9.731.0.3			This notification will be sent when the gateway congestion level goes below cegCongestionLowThreshold value. This gives an indication that the gateway has recovered from congestion and it can accept all calls.
T/F cegCongestionClearNotifEnable	1.3.6.1.4.1.9.9.731.1.4.3	TruthValue	read-write	The object controls the generation of cegCongestionClearedNotif as follows: 'true(1)' - the generation of cegCongestionClearedNotif notifications is enabled. 'false(2)' - the generation of cegCongestionClearedNotif notifications is disabled.
U32 cegCongestionDfpWeight	1.3.6.1.4.1.9.9.731.1.3.8.1	Unsigned32	read-only	This object represents the DFP weight value, which is the measure of the load on CPU in the gateway.
NUM cegCongestionHighLastDuration	1.3.6.1.4.1.9.9.731.1.3.8.6	TimeInterval	read-only	This object represents the duration of the last high congestion.
TIM cegCongestionHighLastOccurTime	1.3.6.1.4.1.9.9.731.1.3.8.5	TimeStamp	read-only	This object represents the timestamp at which high congestion last occurred on the gateway.
T/F cegCongestionHighNotifEnable	1.3.6.1.4.1.9.9.731.1.4.1	TruthValue	read-write	The object controls the generation of cegCongestionHighThresholdNotif as follows: 'true(1)' - the generation of cegCongestionHighThresholdNotif notifications is enabled. 'false(2)' - the generation of cegCongestionHighThresholdNotif notifications is disabled.
U32 cegCongestionHighThreshold	1.3.6.1.4.1.9.9.731.1.2.1.2	Unsigned32	read-write	This object specifies the high threshold for congestion. Congestion DFP metric considers the current CPU memory usage and number of bearers open. Once the high threshold is reached all new calls are rejected.
NTF cegCongestionHighThresholdNotif	1.3.6.1.4.1.9.9.731.0.1			This notification will be sent when the gateway congestion level goes above cegCongestionHighThreshold value. This gives an indication that the gateway is running at high congestion and at this state it would reject all new calls.
C32 cegCongestionHighThresholdReached	1.3.6.1.4.1.9.9.731.1.1.1.3	Counter32	read-only	This object represents the number of times high congestion occurred on the gateway. The value is equal to the number of times the gateway exceeded the congestion threshold cegCongestionHighThreshold.
C32 cegCongestionIncomingReqDropsEx	1.3.6.1.4.1.9.9.731.1.1.1.1	Counter32	read-only	This object represents the total number of incoming calls dropped at the gateway. This counter is incremented when the gateway receives an incoming call request at high congestion level, and the request is dropped.
NUM cegCongestionLowLastDuration	1.3.6.1.4.1.9.9.731.1.3.8.4	TimeInterval	read-only	This object represents the duration of last low congestion.
TIM cegCongestionLowLastOccurTime	1.3.6.1.4.1.9.9.731.1.3.8.3	TimeStamp	read-only	This object represents the timestamp at which low congestion last occurred on the gateway.
T/F cegCongestionLowNotifEnable	1.3.6.1.4.1.9.9.731.1.4.2	TruthValue	read-write	The object controls the generation of cegCongestionLowThresholdNotif as follows: 'true(1)' - the generation of cegCongestionLowThresholdNotif notifications is enabled. 'false(2)' - the generation of cegCongestionLowThresholdNotif notifications is disabled.
U32 cegCongestionLowThreshold	1.3.6.1.4.1.9.9.731.1.2.1.1	Unsigned32	read-write	This object specifies the low threshold for congestion. Congestion DFP metric considers the current CPU memory usage and number of bearers open. On reaching the low congestion threshold, based on the ARP, high priority calls are accepted and those with a lower priority are rejected.
NTF cegCongestionLowThresholdNotif	1.3.6.1.4.1.9.9.731.0.2			This notification will be sent when the gateway congestion level goes above cegCongestionLowThreshold value. This gives an indication that the gateway is running at low congestion at this state it can accept only the high priority calls and those with a lower priority would be rejected.
C32 cegCongestionLowThresholdReached	1.3.6.1.4.1.9.9.731.1.1.1.2	Counter32	read-only	This object represents the number of times low congestion occurred on the gateway. The value is equal to the number of times the gateway exceeded the congestion threshold cegCongestionLowThreshold.
INT cegCongestionStatus	1.3.6.1.4.1.9.9.731.1.3.8.2	INTEGER	read-only	This object represents the gateway congestion status. normal - The gateway is not in a congestion state. At this state, the value of cegCongestionDfpWeight is less than value of cegCongestionLowThreshold. low - The gateway is running in low congestion state. At this state, the value of cegCongestionDfpWeight is more than value of cegCongestionLowThreshold but less than value of cegCongestionHighThreshold. high - The gateway is running in high congestion state. At this state, the value of cegCongestionDfpWeight is more than value of cegCongestionHighThreshold.
cegOverloadProtectionConfig	1.3.6.1.4.1.9.9.731.1.2.1
cegOverloadProtectionConfigGrp	1.3.6.1.4.1.9.9.731.3.2.4			This group has a collection of objects which configures attributes for overload protection.
cegOverloadProtectionNotifGrp	1.3.6.1.4.1.9.9.731.3.2.9			This group has a collection of notification which informs about the congestion level in the system.
cegOverloadProtectionNotifMgmtGrp	1.3.6.1.4.1.9.9.731.3.2.8			This group has a collection of objects which controls the generation of congestion notification in the system.
cegOverloadProtectionStats	1.3.6.1.4.1.9.9.731.1.1.1
cegOverloadProtectionStatsGrp	1.3.6.1.4.1.9.9.731.3.2.2			This group has a collection of objects to provide the overload protection statistics.
cegOverloadProtectionStatus	1.3.6.1.4.1.9.9.731.1.3.8
cegOverloadProtectionStatusGrp	1.3.6.1.4.1.9.9.731.3.2.7			This group has a collection of objects to provide the overload protection status.
C32 cegPacketDropDueToMaxBufferLimit	1.3.6.1.4.1.9.9.731.1.1.2.11	Counter32	read-only	This object represents the number of packet drops due to bearer maximum buffer limit.
C32 cegPacketDropDueToMaxPacketLimit	1.3.6.1.4.1.9.9.731.1.1.2.10	Counter32	read-only	This object represents the number of packet drops due to bearer maximum packet limit.
cegSystemStatusGrp	1.3.6.1.4.1.9.9.731.3.2.1			This group has a collection of objects to provide the system status.
cegSystemStatusGrpSup1	1.3.6.1.4.1.9.9.731.3.2.10			This group has objects to supplement the cegSystemStatusGrp.
cegSystemStatusGrpSup2	1.3.6.1.4.1.9.9.731.3.2.11			This group has objects to supplement the cegSystemStatusGrp
cegSystemStatusGrpSup3	1.3.6.1.4.1.9.9.731.3.2.12			This group has a collection of objects which provides the details of the EPC Gateway status and supplements the cegSystemStatusGrp.
G32 cegTotalBufferAvailable	1.3.6.1.4.1.9.9.731.1.3.9.4	Gauge32	read-only	This object represents the total unallocated bytes at buffering agents.
G32 cegTotalBufferedBytes	1.3.6.1.4.1.9.9.731.1.3.9.3	Gauge32	read-only	This object represents the total number of bytes buffered at present in the buffers of buffering agents.
G32 cegTotalBufferedPackets	1.3.6.1.4.1.9.9.731.1.3.9.2	Gauge32	read-only	This object represents the total number of packets buffered at present in the buffers of buffering agents.
G32 cegTotalIdleSessions	1.3.6.1.4.1.9.9.731.1.3.18	Gauge32	read-only	This object represents the total number of sessions currently in Idle state in the gateway.
G32 cegTotalIdleUsers	1.3.6.1.4.1.9.9.731.1.3.5	Gauge32	read-only	This object represents the total number of users currently in ISR state in the gateway.
G32 cegTotalInUseBuffers	1.3.6.1.4.1.9.9.731.1.3.9.1	Gauge32	read-only	This object represents the total number of buffers currently allocated for the bearers, by buffering agents.
G32 cegTotalSuspendedUsers	1.3.6.1.4.1.9.9.731.1.3.6	Gauge32	read-only	This object represents the total number of users suspended by the gateway. A user would be suspended when E-UTRAN coverage is overlapped by either GERAN or UTRAN coverage leading to a Circuit Switch fallback from E-UTRAN. The Circuit Switch fallback enables reuse of voice and other Circuit Switch services by reuse of the Circuit Switch infrastructure.
G32 cegTotalUsers	1.3.6.1.4.1.9.9.731.1.3.4	Gauge32	read-only	This object represents the total number of users connected to the gateway.
STR cegVersion	1.3.6.1.4.1.9.9.731.1.3.1	SnmpAdminString	read-only	This object represents the current version of the PGW or SGW software running on the gateway. Display format: : :.
ciscoEpcGatewayConfig	1.3.6.1.4.1.9.9.731.1.2
ciscoEpcGatewayMIB	1.3.6.1.4.1.9.9.731			This MIB module manages the features and configuration for PDN Gateway(PGW) and Serving Gateway(SGW) in Evolved Packet Core(EPC) architecture. The PGW is the permanent IP point-of-attachment for access via the E-UTRAN. The PGW performs IP policy and charging enforcement on packet flows to and from mobile devices. The SGW is a local mobility anchor for E-UTRAN mobility, switching packets between the S5 interface and the GTP based S1-U interface for mobiles in connected mode. +------------------------------------------------+ \| \| \| \| \| +=======+__________ \| \| \| UTRAN \| \|S12 \| \| \| +======+ \| \| \| +======\| \| \| \| \| +======\| SGSN \|___ \| \| \| \| +======+ \|\| \| \| \| GERAN \| \| S4\|\| \| \| +=======+ \|(GTP-C\|\| \| \| S3\| VO,V1\|\| \| \| \| GTPU\|\| \| \| \|VO,V1)\|\| \| \| +======+ \|\| \| \| ____\| MME \|__ \|\| \| \| \| +======+ \|\|\| \| \| S1-MME\| S11 \|\|\| \| \| \| GTP-C \|\|\| \| \| \| (V0,V1,V2) \|\|\| \| \|+====+ +========+ +======+ +======+ \| +===+ \|\| UE \|-\|E-Utran \| \| SGW \| \| PGW \|-SGi-\|PDN\| \|\| \| \|(EnodeB)\| \| \| \| \| \| \| \| \|+====+ +========+ +======+ +======+ \| +===+ \| \| \| \| GTP-C \| \| \| \| \| \|(vo,v1,v2)\| \| \| \| \| \|GTP-C \| \| \| \| \| \| (vo,v1) \| \| \| \| GTP v2-u \| \| \| \| \| ------------ ----------- \| \| (S1-U) S5 \| \| \| +------------------------------------------------+ This architecture supports the non-roaming and roaming architectures using GTP based protocol on the PGW and SGW with a number of functions. It support high number of subscribers with their associated control messages and data traffic. Each of this association forms an entry in PGW and SGW and is commonly know as bearers. The various features used by this architecture and their attributes are captured in this MIB: 1. Overload protection, handles congestion control, SGW and PGW represent congestion as a DFP metric considering the current CPU, memory usage and number of bearers open. On reaching the low congestion threshold, based on the ARP, high priority calls are accepted and those with a lower priority are rejected. Once the high threshold is reached all new calls are rejected. 2. Buffering agent, the SGW buffers the data packets in the downlink direction till the downlink path/peer information is ready. It buffers all packets coming from any gateway based on the default/configured values of the buffer size, discard period and number of packets. Packets will be buffered on a per bearer basis and retrieved in the order it was buffered using the handle given by the buffering agent initially. If the buffer is full then no more bearers will be accepted. Acronyms and terms: 3GPP 3rd Generation Partnership Project DFP Dynamic Feedback Protocol EDGE Enhanced Data rates for GSM Evolution EPC Evolved Packet Core E-UTRAN Evolved UTRAN GERAN GSM EDGE Radio Access Network GPRS General Packet Radio Service GSM Global System for Mobile communications GTP GPRS Tunneling Protocol PDN Public Data Network PGW PDN Gateway SAE System Architecture Evolution SGW Serving Gateway SP GW An integrated SGW and PGW Gateway UE User Equipment UMTS Universal Mobile Telecommunications System UTRAN UMTS Radio Access Network REFERENCE [1] 3GPP: Evolved GPRS Tunneling Protocol for Control Plane (GTPv2-C). 3GPP TS 29.274 V1.3.1. [2] 3GPP: GPRS enhancements for E-UTRAN access. 3GPP TS 23.401 V8.3.0. [3] 3GPP: Circuit Switched fallback in Evolved Packet System(EPS). 3GPP TS 23.272.
ciscoEpcGatewayMIBCompliance	1.3.6.1.4.1.9.9.731.3.1.1			The compliance statement is for the entities which implement CISCO-EPC-GATEWAY-MIB. This is deprecated by ciscoEpcGatewayMIBComplianceRev1.
ciscoEpcGatewayMIBComplianceRev1	1.3.6.1.4.1.9.9.731.3.1.2			The compliance statement is for the entities which implement CISCO-EPC-GATEWAY-MIB. This is deprecated by ciscoEpcGatewayMIBComplianceRev2.
ciscoEPCGatewayMIBComplianceRev2	1.3.6.1.4.1.9.9.731.3.1.3			The compliance statement is for the entities which implement CISCO-EPC-GATEWAY-MIB. This is superceded by ciscoEpcGatewayMIBComplianceRev3.
ciscoEpcGatewayMIBComplianceRev3	1.3.6.1.4.1.9.9.731.3.1.4			The compliance statement is for the entities which implement CISCO-EPC-GATEWAY-MIB.
ciscoEpcGatewayMIBCompliances	1.3.6.1.4.1.9.9.731.3.1
ciscoEpcGatewayMIBConformance	1.3.6.1.4.1.9.9.731.3
ciscoEpcGatewayMIBGroups	1.3.6.1.4.1.9.9.731.3.2
ciscoEpcGatewayMIBNotifications	1.3.6.1.4.1.9.9.731.0
ciscoEpcGatewayMIBObjects	1.3.6.1.4.1.9.9.731.1
ciscoEpcGatewayNotifMgmt	1.3.6.1.4.1.9.9.731.1.4
ciscoEpcGatewayStatistics	1.3.6.1.4.1.9.9.731.1.1
ciscoEpcGatewayStatus	1.3.6.1.4.1.9.9.731.1.3

RFC description

Manages PDN Gateway (PGW) and Serving Gateway (SGW) functions in Evolved Packet Core (EPC) architecture for LTE networks.

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