• International Area Studies Review
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• v.18 no.3
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• pp.249-265
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• 2014

The international mobile roaming service has been provided for more than one decade, but high price of international mobile roaming service, which is represented as 'bill shock' is still of major concern in lots of countries including Korea. With understanding of the given price issues, the international organizations, such as OECD, EU, WTO, ITU have been conducting extensive analyses and studies to find suitable solutions and appropriate measures. In the case of EU regulate the international roaming charges and implement the regulation policy. OECD do not have a compelling regulation on roaming charges, but OECD request to member state to find the reasons of high roaming charges and its solution. WTO Council for Trade in Services is reviewing the international mobile roaming in terms of whether impede international trade in services. The purpose of this study is to review many different approaches in international organizations related to reducing international roaming service charges, to drive some regulatory policy directions for reducing roaming charges.

• Journal of Korea Multimedia Society
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• v.10 no.7
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• pp.902-911
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• 2007

GSM platform is a hugely successful wireless technology and an unprecedented story of global achievement. In less than ten years since the first GSM network was commercially launched, it became the world's leading and fastest growing mobile standard, using over 1 billion GSM subscribers across more than 200 countries of the world. GSM platform evolved into 3th generation mobile communication which includes not only voice call services but also the international roaming and various kinds of the multimedia services. GSM is an essential element techniques a safe data transmission and a personal private protection while support services. However, a crypto algorithm and a secure protocol for a safe data communication using GSM are indicating various kinds of problems. In this paper, we propose a more safer and more efficient authentication protocol in 3th generation network through analysis of GSM security mechanism of 2th/2.5th generation. This security protocol offers enforced security efficiency by using user verification between SIM/ME and reduction of authentication and key agreement step between SIM/ME/AuC.