• KSII Transactions on Internet and Information Systems (TIIS)
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• v.9 no.1
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• pp.34-49
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• 2015

Market means of spectrum trading have been utilized as a vital method of spectrum sharing and access in future cognitive radio system. In this paper, we consider the spectrum trading with multiple primary carrier providers (PCP) leasing the spectrum to multiple secondary carrier providers (SCP) for a short period of time. Several factors including the price of the resource, duration of leasing, and the spectrum quality guides the proposed model. We formulate three trading policies based on the game theory for dynamic spectrum access in a LTE based cognitive radio system (CRS). In the first, we consider utility function based resource sharing (UFRS) without any knowledge of past transaction. In the second policy, each SCP deals with PCP using a non-cooperative resource sharing (NCRS) method which employs optimal strategy based on reinforcement learning. In variation of second policy, third policy adopts a Nash bargaining while incorporating a recommendation entity in resource sharing (RERS). The simulation results suggest overall increase in throughput while maintaining higher spectrum efficiency and fairness.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2004.07a
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• pp.431-431
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• 2004

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.23 no.8
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• pp.888-899
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• 2012

In this paper, we present refarming plans and discuss about Radio Waves Law improvements to promote the efficient use of the 1.8 GHz(3GPP band 3) which is emerging as the best prime band for LTE-FDD service. We think it is important to make use of the entire band for mobile use in accordance with contiguity requirement, especially for LTE such as European countries, which is currently separated between different uses. We present two options with illustrative examples to enable that objective. And we identify several provisions in the Radio Waves Law expected to cause controversy when activates one between two options as the policy, and discuss improvements of those.

• International Commerce and Information Review
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• v.8 no.1
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• pp.243-257
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• 2006

This study is to introduce the Chinese Contract Law against non-performance of the contract and to solve the wide range of problems involving to executing the trading contract. The parties' liability for the period of performance, the place of performance, the failure to deliver conforming goods together with it's nature of the lack of conformity, and the methods of compensation against damages and the force majeure clauses application. Those issues affect directly to commercial transactions in international business. The focus is more on the interrelationship of private individuals in its trade and on aiming to remove the legal obstacles from the Chinese Contract Law to freely flow of international trade. Reference may include foreign corrupt practices, Conventions on Contracts for the International Sale of Goods and Laws of England, France, and Japan. This study has brought the efforts of these issues in the full spectrum of performance and with concentrations on effectiveness to avoid the different viewpoints of the general principles of CISG and commercial practice founded pre-eminently. This study, in presenting the legal framework, will contribute to a better understanding of the purpose of rules of Chinese Contract -Law as they interact to the benefit of the parties involved in international trade transactions. The writer believes that a problem-oriented approach and the concentration as outlined above would offer a different perspective for law faculty teaching in this area and hope that this study can be sufficiently diverse to satisfy many of those views.