CHANGING THE WAY WE COMMUNICATE Satellite Mobile Systems Choosing Technologies and System Architectures Nera SatCom ASMS-TF Meeting

2ASMS-TF Meeting / KPS Goal s Make mobile satcom a healthy business s Make the right choices Mobile satcom can not afford more mistakes s Looking back: Did ASMS-TF mean a difference ? Did we find and propose the right path ahead ?

3ASMS-TF Meeting / KPS Key questions for mobile satcom: Market and services s What are the market segments and user profiles ? s What kind of services and QoS are required ? Can they be fulfilled at an acceptable cost ? s How big is the true mobile market compared to semi-fixed ? How often is handover required ? s How many will use a large dual-mode terminal ? s What kind of roaming and mobility management services are necessary ?

4ASMS-TF Meeting / KPS Key questions for mobile satcom: Cost issues s What are the critical air-time tariffs ? How much more than terrestrial mobile ? s Will there be acceptance for extra roaming costs on top the basic cost of satellite ?

5ASMS-TF Meeting / KPS Key questions for mobile satcom: Rollout, timeframe and risks s When will T-UMTS be debugged and ready for widespread use ? s Can we afford the risk of introducing S-UMTS simultaneously or even before T-UMTS ? When will the S-UMTS risk level be acceptable ? s Can we wait for stable S-UMTS systems or must we have other solutions before with comparable capacity and services ?

6ASMS-TF Meeting / KPS Choice of technologies and system architectures for mobile satcom Timeframe Services QoS Market and requirements - Segments - Needs Cost and pricing Available technology Market size Customer base Performance/capacity Efficiency Technology System architecture

7ASMS-TF Meeting / KPS What brings success to mobile satcom ? s Being integrated with the land mobile networks ? or s Being directly connected to the world wide fixed terrestrial network ? or s A combination ?

8ASMS-TF Meeting / KPS Nera standpoint on mobile satcom s Mobile satcom will mainly fill a complementary role s Primarily professional markets Mobile satcom is a niche market The mobile satellite business is small s Cost-effective solutions for small market s Roaming is expensive and can be handled by other methods s Primarily semi-fixed (UMTS data rates) s Focus on services really needed s Optimal and efficient air interface designed for satellite s Evolutionary approach to healthy business

9ASMS-TF Meeting / KPS Neras conclusion and primary choice s Linked to the fixed terrestrial network > Keeps it simple and low risk on network side: –Dial up packet data service to Internet (VoIP to PSTN) –Standard ISP technology –IP routing in the network –The terminals can be simple dial up customers to an existing Internet Service Provider –Not dependant on the unpredictable launching of terrestrial 3G –Optimal air interface and optimal resource usage > DVB-RCS based approach is one solution

10ASMS-TF Meeting / KPS Internet Service Provider Internet IP DVB-RCS and satellite interface Gateway IP Fwd:450kb/s Ret:200 kb/s X* users VoIP PSTN System overview DVB-RCS

11ASMS-TF Meeting / KPS Main alternatives s Fixed network extension > Phase 1:DVB-RCS with basic modifications for mobile (physical layer, minor adaptation for low rates) > Phase 2:Optimal fixed-based standard for mobile systems s Land mobile extension (S-UMTS) s Fixed network based and S-UMTS complementary or mutually exclusive ? s All the eggs in the same basket ?