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CSE: CAMEL Service Environment
CSFB: CS fallback
CSG: Closed Subscriber Group
CSG ID: Closed Subscriber Group Identity
CSI: Channel State Information
CSI-IM: CSI interference measurement
CSI-RS: Channel State Information Reference Signal
CSI-RSRP: CSI Reference Signal Received Power
CSI-RSRQ: CSI Reference Signal Received Quality
CSI-SINR: CSI Signal-to-Interference-plus-Noise Ratio
CSIF: Communication Service Interface
CSK: Client-Server Key
CSK-ID: Client-Server Key Identifier
CSMA/CD: Carrier Sense Multiple Access / Collision Detection
CSP: Communications Service Provider
CSR: Cell Site Report
CSS: Common Search Space
CSV: Comma Separated Values
CTA: Consumer Technology Association
CTC: Call for TeChnologies
CTF: Charging Trigger Function
CTF (ADF): Charging Trigger Function (Accounting Data Forwarding)
CTM: Cellular Text telephone Modem
CTR: Counter (mode)
CTS: Cordless Telephony System
CTU: Coding Tree Unit
CU: Central Unit
CUC: Centralized User Configuration
CUG: Closed User Group
CUO: Certificate Update Orchestrator
CUPS: Control and User Plane Separation
CVE: Common Vulnerabilities and Exposures
CVO: Coordination of Video Orientation
CVSS: Common Vulnerability Scoring System
CW: Continuous Wave
CWE: Common Weakness Enumeration
CeEF: Certificate Enrolment Function
CeMF: CEMAF Management Function
Cell-ID: Cell Identity
CoA: Care of Address
CoAP: Constrained Application Protocol
CoM: Centre of Mass
CoMP: Coordinated Multi Point
CoT: Chain of Trust
Conv: Conversational
D-CPICH: Demodulation Common Pilot Channel
D2D: Device to Device
DA: Distribution Automation
DAA: Detect and Avoid
DAC: Digital to Analogue Converter
DAG: Directed Acyclic Graph
DAI: Digital Audio Interface
DAP: Data Application Provider
DAPS: Dual Active Protocol Stacks
DAR: DAmage Rate
DASH: Dynamic Adaptive Streaming over HTTP
DB-DC-HSDPA: Dual Band Dual Cell HSDPA
DBI: Delay Budget Information
DC: Data Channel or Direct Current
DC-AF: Data Collection AF
DC-Client: Data Collection Client
DC-HSDPA: Dual Cell HSDPA
DC-HSUPA: Dual Cell HSUPA
DCA: Direct Communication Accept
DCAR: Data Channel Application Repository
DCCA: Diameter Credit Control Application
DCCF: Data Collection Coordination Function
DCCH: Dedicated Control Channel
DCH: Dedicated CHannel
DCI: Downlink Control Information
DCK: Depersonalisation Control Keys
DCMF: Data Channel Media Function
DCMTSI: Data Channel Multimedia Telephony Service for IMS
DCN: Dedicated Core Networks
DCP: DCI with CRC scrambled by PS-RNTI
DCQR: Downlink Channel Quality Report
DCR: Direct Communication Request
DCS: Data Channel Server
DCS-C: Control Function of Data Channel Server
DCS-M: Media Function of Data Channel Server
DCSF: Data Channel Signalling Function
DD: Data Delivery
DDAA: Direct Detect And Avoid
DDD: Downlink Data Delivery
DDDS: Downlink Data Delivery Status notification with UPF buffering
DDF: Device Description Framework
DDN: Downlink Data Notification
DDNMF: Direct Discovery Name Management Function
DDX: Downlink Data Expected
DDoS: Distributed Denial of Service
DEI: Drop Eligible Indicator
DENM: Decentralized environmental notification message
DER: Distinquished Encoding Rules
DF: Dedicated File
DFF: Direct Far Field
DFN: Direct Frame Number
DFT: Discrete Fourier Transformation
DFT-S-OFDMA: Discrete Fourier Transform-Spread-Orthogonal Frequency-Division Multiple Access
DFT-s-OFDM: Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing
DFTS: DFT Spread OFDM