OCF Open Card Framework
OCI Outgoing Call Information
OCNG OFDMA Channel Noise Generator
OCNS Orthogonal Channel Noise Simulator
OCS Online Charging System
OCT Outgoing Call Timer
OD Optional for operators to implement for their aim
ODB Operator Determined Barring
ODCCH ODMA Dedicated Control Channel
ODCH ODMA Dedicated Channel
ODMA Opportunity Driven Multiple Access
ODTCH ODMA Dedicated Traffic Channel
OFCS Offline Charging System
OFDM Orthogonal Frequency Division Multiplexing, мультиплексирование с ортогональным частотным разнесением.
OFDMA Orthogonal Frequency Division Multiple Access, множественный доступ на основе ортогонального частотного разнесения.
OFM Operational Feature Monitor
OID Object Identifier
OLR Overall Loudness Rating
OMA Open Mobile Alliance, международная организация производителей пользовательских услуг для мобильных телекоммуникационных устройств.
OMC Operation and Maintenance Centre
OML Operations and Maintenance Link
OOB Out-of-band
OPI Offload Preference Indicator
OPLMN Operator Controlled PLMN (Selector List)
OR Optimal Routeing
ORACH ODMA Random Access CHannel
ORLCF Optimal Routeing for Late Call Forwarding
OS Operations System
OSA Open Service Access
OSI RM OSI Reference Model
OSI Open System Interconnection
OSP Octet Stream Protocol
OSP:IHOSS Octet Stream Protocol for Internet Hosted Octet Stream Service
OTA Over-The-Air
OTDOA Observed Time Difference Of Arrival (positioning method)
OTP One Time Password
OVSF Orthogonal Variable Spreading Factor
P2X Pedestrian-to-Everything
PA Power Amplifier
PABX Private Automatic Branch eXchange
PACCH Packet Associated Control Channel
PAD Packet Assember/Disassembler
PAGCH Packet Access Grant Channel
PAP Password Authentication Protocol
PAPR Peak-to-Average Power Ratio
PAR Peak to Average Ratio
PB Pass Band
PBCCH Packet Broadcast Control Channel
PBCH Physical Broadcast Channel, физический вещательный канал.
PBID PhoneBook IDentifier