Fixed Network: NGN strategy
- Overlay NGN is for new services and also to new areas
The overlay scenario retains the PSTN or the TDM network for POTS users and implements an NGN as a parallel network supporting VOIP users and the associated services. The IP-enables TDM switches can be brought under the control of soft switch as required . The two networks are connected by means of a media gateway. The TDM network can be decommissioned once most of the POTS users have migrated to the NGN.
- It is needed to accomplish broadband access and renew declining fixed telecommunications
NGN can accelerate the pace of broadband access rollout as well as the pace of VOIP rollot. To provide high speed broadband access, the twisted pair copper line must be upgraded and replaced by fibers. The VDSL might be a good solution (VDSL can provide high speed download up to 25Mbps). However, VDSL requires a very short distance of the twisted pair copper line. Some countries have an average last mile length of 300 to 1,000 meters such as Germany and the Netherlands. Some countries jump to FTTH such as Japan. Economic and user requirements must be studied before selecting access technologies options.
- Enriching fixed voice with multimedia and nomadic mobility; improving service creation,shorter time to market
IMS solution provides a mobility solution both mobility capable by roaming and nomadic mobility (mobility with limited area). The advantage of NGN architecture is fast deployment of services on a shared multi-service.
- Opening towards multi-access, fixed and mobile communications
NGN should be designed for access technology independent and can support mobility.
Circuit switched network strategy
- Network migration—Overlay network migration is economical justification compared with other alternatives (replace and upgrade TDM). The POTs can be provided by NGN through MSAN and the end subscriber in one location can be control from NGN soft switch at any location.
- Voice will go to IP (NGN)
Most incumbent operators are now facing high cost for running TDM (aging technologies) and several core networks. The IP networks promise to be simpler to run and maintain than the legacy networks. The migration to IP networks provides operators with low both OPEX and CAPEX. In addition pressure from the competition of VOIP from the Internet-based providers such as Skype and local ISPs has stimulated the incumbent to move to NGN rapidly.
Mobile Network: NGN strategy
- IMS is for standard and perspective service
implementation and for new services
IMS is the industry direction of NGN. It is the world standard for NGN architecture both fixed and mobile network (TISPAN and 3GPP).
- Mobile broadband shall be deployed for
providing IMS-based services
- Speeding up development, shorter time to
market; improved service flexibility
- Extending proven mobile solutions to other
access media
Circuit switched network strategy
- GSM as circuit switched domain is kept in R4
UMTS architecture for voice
- Migrating voice to IP is depends on
deployment of IMS-based services needing
new access and CPEs
- Voice will go to IP (NGN) gradually in longer
Source:
1. Ericsson
2. J. SCott Marcus and Dieter Elixman, Regulatory Approaches to NGNs: an International Comparision, wik-Consult GmbH
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