Foreword1 Scope2 General description3 Network Architecture4 CBE Functionality5 CBC Functionality5A CBCF Functionality6 BSC/RNC/MME/AMF Functionality7 BTS Functionality8 MS/UE Functionality9 Protocols and Protocol Architecture9.1 Requirements on Core Network and Radio Access Network9.2 Requirements on the CBC-RAN, CBC-MME and CBCF-AMF interfaces9.3 Parameters9.4 Message Format on the Radio Network – MS/UE Interface9.5 CBS Compression9A Service Based Interface for 5G System10 CBS IndexB.1 5GS PWS architecture with PWS-IWFB.2 CBE FunctionalityB.3 CBC FunctionalityB.4 PWS-IWF FunctionalityB.5 AMF FunctionalityB.6 UE FunctionalityB.7 Protocol stack when AMF and CBC inter-connects via PWS-IWF B.3 CBC Functionality 23.0413GPPRelease 18Technical realization of Cell Broadcast Service (CBS)TS Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM See clause 5 of the present document.