Cisco ASR 5000 series Product Overview page 981

Glossary
D
Data Radio Bearer. Data Radio bearer transports the packets of an E-RAB between a UE and an eNB. There is an one-
to-one mapping between the E-RAB and the Data Radio Bearer.
DCCA. DIAMETER Credit Control Application. IETF Diameter Credit Control Application framework.
Dedicated bearer. An EPS bearer that is associated with uplink packet filters in the UE and downlink packet filters in
the PDN GW where the filters only match certain packets.
Default APN. A Default APN is defined as the APN which is marked as default in the subscription data and used
during the Attach procedure for PDN connection.
Default Bearer. The EPS bearer which is first established for a new PDN connection and remains established
throughout the lifetime of the PDN connection.
Dedicated PDP Context. A PDP context with associated TFT filters, this may be a secondary or a primary PDP context
(updated after its activation). There can be several such PDP contexts for a UE IP address.
Destination Context. The virtual context, or location, where a particular service configuration resides that mobile
subscriber is directed to upon successful authentication through the system.
DHCP. Dynamic Host Configuration Protocol. A protocol by which a host obtains from a server certain information it
needs to communicate, such as an IP address, prefix length, and Domain Name System (DNS) server address.
Diameter. A next-generation AAA protocol.
DNS. Domain Naming System. A system within the network that maps host-names into IP addresses.
Downlink. The direction of MSC to BSC.
DPD. Dead Peer Detection. Also known as Keepalive, this is a timer that starts after the last IKE_AUTH message is
sent to the MS and resets when traffic is received from the MS. If no valid messages are received when the timer expires
the session is disconnected.
Dynamic Charging Rule. Charging rule where some or all of the data within the charging rule (e.g. service data flow
filter information) is assigned via real-time analysis using for example dynamic application derived criteria. An example
of a dynamic charging rule is a rule determined by the E-PDF by means of real-time SDP derived information analysis.
E
EAP. Extensible Authentication Protocol. EAP is an authentication protocol which provides an infrastructure that
enables clients to authenticate with a central authentication server.
EAP-AKA. An extension to the EAP enabling authentication and session key distribution using the UMTS AKA
(Authentication and Key Agreement) mechanism.
EIR. Equipment Identity Register. This security-based database enables network operators to track mobile phones in a
wireless network and to disable stolen equipment.
EHPLMN. Equivalent Home PLMN. Any of the PLMN entries contained in the Equivalent HPLMN list.
EMACS. A standard UNIX text editor. EMACS commands are used to manipulate command lines in the CLI.
EMM context. An EMM context is established in the UE and the MME when an attach procedure is successfully
completed.
EMM-CONNECTED mode. A UE is in EMM-CONNECTED mode when a NAS signalling connection between UE
and network is established. The term EMM-CONNECTED mode used in the present document corresponds to the term
ECM-CONNECTED state used in 3GPP TS 23.401.
EMM-IDLE mode. A UE is in EMM-IDLE mode when no NAS signalling connection between UE and network exists.
EMS. Element Management System. Defines the system or application used to manage a network device, or groups of
like network devices.
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