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CFRA: Contention Free Random Access
CFU: Communication Forwarding Unconditional
CG: Carrier Group
CG-DFI: CG - Downlink Feedback Information
CG-SDT: Configured Grant-Small Data Transmission
CG-UCI: CG - Uplink Control Information
CGF: Charging Gateway Function
CGI: Cell Global Identifier
CH: Credentials Holder
CHAP: Challenge-Handshake Authentication Protocol
CHEM: Coverage and Handoff Enhancements using Multimedia error robustness feature
CHF: CHarging Function
CHO: Conditional Handover
CHP: Constrained High Profile
CI: Cancellation Indication
CI-RNTI: Cancellation Indication RNTI
CIBR: Common Informative Binaural Renderer
CICP: Coding-independent Code Points
CID: Cell-ID (positioning method)
CIF: Carrier Indicator Field
CIM: Counter-InterModulation
CIR: Channel Impulse Response
CIS: Center for Internet Security
CIoT: Cellular Internet of Things
CJT: Coherent Joint Transmission
CK: Cipher key
CKSRVCC: Cipher Key for Single Radio Voice Continuity
CLAS: Centimetre Level Augmentation Service
CLF: Connectivity session Location and repository Function
CLI: Calling Line Identifier
CLTA: Co-Location Test Antenna
CLUE: ControLling mUltiple streams for tElepresence
CM: Connection Management
CMAF: Common Media Application Format
CMAS: Commercial Mobile Alert Service
CMC: Configuration Management Client
CMNE: Certificate Management Network Entity
CMOS: Complementary Metal-Oxide-Semiconductor
CMP: Certificate Management Protocol
CMR: Channel Measurement Resource
CMS: Configuration Management Server
CN: Core Network
CN PDB: Core Network Packet Delay Budget
CN-TL: Core Network Talker Listener function
CNAME: Canonical Name
CNAV: Civil Navigation
CNC: Centralized Network Configuration
CNF: Conjunctive Normal Form
CNI: Critical National Infrastructure
CNL: Co-operative Network List
CNN: Convolutional Neural Network
CNR: Completion of communication on No Reply
CO: Conditional Optional
CONF: CONFerence calling
CORBA: Common Object Request Broker Architecture
CORESET: Control Resource Set
CORS: Cross-Origin Resource Sharing
COT: Channel Occupancy Time
COTS: Commercial Off The Shelf
CP: Cyclic Prefix
CP-CIoT: Control Plane CIoT
CP-EDT: Control Plane EDT
CP-OFDM: Cyclic Prefix-OFDM
CP-OFDMA: Cyclic Prefix-Orthogonal Frequency-Division Multiple Access
CP-PRUK: Control Plane ProSe Remote User Key
CPA: Conditional PSCell Addition
CPAC: Conditional PSCell Addition / Change
CPBCCH: COMPACT Packet BCCH
CPC: Conditional PSCell Change
CPCF: Content Provider Charging Function
CPCN: Control Plane data transfer Charging Node (MME, SCEF, IWK-SCEF)
CPE: Common Phase Error
CPG: Call ProGress message
CPICH: Common Pilot CHannel
CPIM: Common Presence and Instant Messaging
CPM: Collective Perception Message
CPN: Customer Premises Network
CPP: Carrier Phase Positioning
CPS: Call Placement Service
CPU: Central Processing Unit
CQI: Channel Quality Indicator
CQP: Contant QP
CQRCI: Clock Quality Reporting Control Information
CR: Certificate Repository
CRB: Common Resource Block
CRC: Cyclic Redundancy Check
CRE: Cell Range Extension
CRF: Charging Rules Function
CRG: Cable Residential Gateway
CRI: CSI-RS Resource Indicator
CRL: Certificate Revocation List
CRS: Cell-specific Reference Signals
CRUD: Create, Read, Update, Delete
CRUDN: Create, Retrieve, Update, Delete and Notify
CS: Circuit Switched
CS-RNTI: Configured Scheduling RNTI
CSA: Capability Set supported by the AAS BS
CSB-ID: Crypto Session Bundle Identifier
CSC: Communication Service Customer
CSCF: Call Server Control Function