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1、Ericsson White PaperBCSD-23:003115 UenMay 2023With the introduction of 4G and 5G,there is a need to plan for the 2G/3G closure in order to reuse the spectrum and to eliminate the cost of 2G/3G equipment.Most communications service providers(CSPs)will close 2G/3G networks at some point in time,but th

2、e strategies and timelines differ and depend on the starting point,for example,licenses,Voice over Long-Term Evolution(VoLTE)penetration,roaming agreements and installed bases of IoT devices.This white paper provides recommendations on how to prepare in the Circuit Switching(CS)and IP Multimedia Sub

3、system(IMS)domains to close either a 2G/3G network,or both,and how to adapt to 2G/3G sunsets for roaming scenarios.Voice and SMS transformation following 2G/3G SunsetVoice and SMS transformation following 2G/3G SunsetContentMay 20232ContentIntroduction 3The evolution to VoLTE and VoNR 4Modernization

4、 of network interconnect 6Preparing for the migration and scaling down of 2G/3G 8 Modernization of legacy services 9Outbound 2G/3G roaming and SMS in 4G 10Maintaining limited 2G/3G network capacity for specific use cases 12VoLTE S8 Home Routed(S8HR)Roaming 15Conclusion 17Glossary 18References 20Auth

5、ors 21Voice and SMS transformation following 2G/3G SunsetIntroductionMay 20233Introduction4G and 5G have enabled CSPs to gain access to new frequency bands and to re-farm the 2G/3G spectrum,allowing it to be used in a more efficient way.This results in more capacity and lower costs for mobile broadb

6、and.Energy efficiency and security are also improving as the transition from 2G/3G to 4G/5G is progressing.The transition from 2G/3G networks to 4G/5G is globally progressing with more than 50 percent of all mobile voice subscriptions moved to VoLTE or Voice over New Radio(VoNR)by now according to t