Cisco ASR 5000 series Product Overview page 992

▀ Environmental Information
Tunneling. The same as encapsulation, but with additional connotations about changing the effects of Internet routing
on the original IP packet.
U
UE. User Equipment. Term commonly used in 3G/4G scenarios. Equivalent to MS or mobile station (commonly used in
2G/2.5G scenarios) and to MN or mobile node (commonly used in 2G/2.5G scenarios involving IP-level functions).
UE-associated logical S1-connection. The UE-associated logical S1-connection uses the identities MME UE S1AP ID
and eNB UE S1AP ID. For a received UE associated S1-AP message the MME identifies the associated UE based on
the MME UE S1AP ID IE and the eNB identifies the associated UE based on the eNB UE S1AP ID IE. The UE-
associated logical S1-connection may exist before the S1 UE context is setup in eNB.
UE-associated signalling. When S1-AP messages associated to one UE uses the UE-associated logical S1-connection
for association of the message to the UE in eNB and EPC.
UMTS. Universal Mobile Telecommunications System. The GSM-based evolution for 3G wireless communications.
This term is also referred to as W-CDMA.
Unicast/MBMS-mixed cell. This is the cell supporting both unicast and MBMS transmissions
Uplink. Any BS that supports the call other than the source BS is designated as a target BS.
V
Visited PLMN. This is a PLMN different from the HPLMN (if the EHPLMN list is not present or is empty) or different
from an EHPLMN (if the EHPLMN list is present).
VLR. Visited Location Register. The VLR caches access service parameter information (such as the MS/UE's mobile
number) that it obtains from a particular user's HLR upon call establishment.
VoIP. Voice over IP. The protocol that describes the packetization of analog voice signals into digital data packets.
VPN. Virtual Private Network. A virtual router or domain instance that enables secure communications between
allowed network users and devices. Context is the work most commonly used to denote this type of connectivity.
W
WCDMA or W-CDMA. Wideband CDMA. The GSM-based evolution for 3G wireless communications. This term is
also referred to as UMTS.
X
X2 Interface. It is a logical interface between two eNBs. Whilst logically representing a point to point link between
eNBs, the physical realization need not be a point to point link.
▄ Cisco ASR 5000 Series Product Overview
Glossary
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