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Feasibility Study of A-interface over Internet Protocol

Master’s Thesis Presentation

Eero Laitinen, 7.9.2009

Supervisor: Professor Heikki Hämmäinen

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Feasibility Study of A-interface over Internet Protocol 2009-09-02

Outline

• Objective of the Study and Methodology• Mobile Market Situation• All-IP Transition• Case Study: Feasibility of AoIP technology• Conclusions


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Objective of the Study andMethodology Objectives:

– Compare GSM A-interface over IP to legacy A-interface over TDM in terms of CAPEX and OPEX

– Study factors influencing expected lifetime of GSM

Methodology:– Literature survey

Books, standards, whitepapers, press releases, etc– Interviews

Ericsson expert interviews


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Outline



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Mobile Market Situation

2G GSM currently the most successful 3G technologies are growing importance LTE is at the ”door step”


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Transport Technologies

Three main transport technologies in mobile networks:– Time Division Multiplexing (TDM)– Asynchronous Transfer Mode (ATM)– Internet Protocol (IP)

Why IP?– Some reasons:

Packet based data transmission considered more efficient and future proof

IP instead of TDM IP used in the datacom índustry

IP can utilize the economies of scale IP instead of ATM


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The Traffic and Revenue Challenge


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All-IP Transition

Reduce costs– Networks are simply transformed to use IP– Preparing for the future– E.g. Circuit-Switched mobile network from TDM/ATM/IP to IP only

Generate revenues– All-IP based core network will provide access to IP based applications via

variety of different access systems– 3GPP IMS and EPS/SAE


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Reduce costs in GSM architecture: A-interface from TDM to IP


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Outline

• Objective of the Study and Methodology• Mobile Market Situation• All-IP Transition• Case Study: Feasibility of AoIP technology

• CAPEX benefits• OPEX benefits• GSM lifetime speculation

• Conclusions


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CAPEX: Transcoding


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CAPEX: MGW Redundancy


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CAPEX: Transmission equipment

Network nodes in AoTDM architecture use TDM ports (e.g. STM-1), whereas network nodes in AoIP architecture use Ethernet ports (e.g. Gigabit Ethernet)

One STM-1 port can carry 1890-1953 voice calls, whereas one Gigabit Ethernet port can carry over 26 000 voice calls

About 13-times more STM-1 ports are needed to fulfil a certain traffic need

The CAPEX benefit depends on the unit prices of the ports


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CAPEX Summary

Transcoderless BSS– No need for transcoders in BSS anymore Transcoder equipment savings

Transcoding in MGW– MGW capacity is impacted due to ”new” transcoding functionality– If capacity decreases, more hardware needs to be purchased, and

if capacity increases, existing hardware becomes available– The impact depends on the traffic model

MGW redundancy – Extended A-interface enables N+1 MGW redundancy Less MGW capacity overdimensioning

Transmission equipment– TDM ports in BSC and MGW are replaced by Ethernet ports Less Ethernet ports are needed than TDM ports and typically

Ethernet ports are also less expensive


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AoIP vs. AoTDM: OPEX

Single transport technology– Operating one transport technology instead of multiple ones is

more cost-efficient– AoIP is only one part of the big picture

Node configuration – Reduced node configuration effort in BSC, MGW and MSC-S

Service availability– Better service availability due to N+1 MGW redundancy

Speech quality– Transcoder Free Operation doesn’t reduce voice quality– Same can be achieved with TFO in AoTDM

Training– Synergy savings with 3G RAN


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GSM lifetime speculation

Operating more than one, not to mentions two, mobile network is considered to be too expensive

3G technologies are expected to replace GSM– 3G will enable new revenue streams– However

3G coverage and existing handset base not yet good enough

- Situation is expected to get better around 2015 Three competing 3G technologies create market

uncertainty

LTE commercial operation is expected to begin in the near future Could it be LTE instead of 3G that will replace GSM?

– It remains to be seen


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Conclusions

GSM has still strong market position– 3G and LTE are expected to replace GSM eventually

AoIP is more cost-efficient option to build and operate GSM networks than legacy AoTDM

AoIP is also more future proof AoIP has business opportunities especially in emerging

markets In developed markets operators will more likely choose

3G and/or LTE


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Questions?Questions?


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