• Title, Summary, Keyword: spectrum

Search Result 11,545, Processing Time 0.058 seconds

Identifying the Winner's Curse in the First Spectrum Auction in the Republic of Korea Using an Event Study Approach

  • Lee, Hyeongjik;Seol, Seongho;Kweon, Soocheon
    • ETRI Journal
    • /
    • v.35 no.6
    • /
    • pp.1126-1133
    • /
    • 2013
  • The first spectrum auction in the Republic of Korea is attention-worthy owing to the fierce competition for the only 1.8-GHz spectrum license, the winning bidder of which was suspected of overpaying for its acquisition. This study empirically investigates the existence of a "winner's curse" in the first Korean spectrum auction by using a standard event study methodology. The results show that both the winner and loser experienced significant positive returns on the completion day of the auction. The results imply that there was no winner's curse in the auction and that the losing firm might increase its competitive advantage by acquiring other spectrum licenses despite failing to achieve its initial target spectrum. Therefore, these results suggest that regulators may need to consider bringing about positive short-term wealth benefits to all bidders by appropriately designing a spectrum auction, such as by performing multiband auctions.

Short Term Spectrum Trading in Future LTE Based Cognitive Radio Systems

  • Singh, Hiran Kumar;Kumar, Dhananjay;Srilakshmi, R.
    • KSII Transactions on Internet and Information Systems (TIIS)
    • /
    • v.9 no.1
    • /
    • pp.34-49
    • /
    • 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.

Analysis of Radio Spectrum Policy for the Fifth Generation Mobile Communications (5G 이동통신을 위한 전파정책 분석)

  • Kim, Chang-Joo
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.26 no.8
    • /
    • pp.679-689
    • /
    • 2015
  • The 5G mobile communication technologies have been extensively developed with the era of mobile broadband, but spectrum policy for this service has not yet set up. In this paper, We have investigated the 5G mobile service and analyzed the 5G spectrum policy taking the developing technologies into account. Based on the results of these analyses, We propose an expansion of spectrum sharing in the 3~5 GHz bands, spectrum harmonization of 5 GHz bands, and restructuring of spectrum management administration from currently three distributed management to centralized spectrum management structure.

Development of Korean Standard Horizontal Design Spectrum Based on the Domestic and Overseas Intra-plate Earthquake Records (국내외 판내부 지진기록을 이용한 한국 표준수평설계스펙트럼의 개발)

  • Kim, Jae Kwan;Kim, Jung Han;Lee, Jin Ho;Heo, Tae Min
    • Journal of the Earthquake Engineering Society of Korea
    • /
    • v.20 no.6
    • /
    • pp.369-378
    • /
    • 2016
  • The design spectrum for Korea, which is known to belong to an intra-plate region, is developed from the ground motion records of the earthquakes occurred in Korea and overseas intra-plate regions. The horizontal spectrum is defined as geometric mean spectrum, GMRotI50. From the statistical analysis of the geometric mean spectra, a mean plus one standard deviation spectrum in lognormal distribution is obtained. Regression analysis is performed on this curve to determine the shape of spectrum including transition periods. The developed design spectrum is valid for the estimation both spectral acceleration and displacement.

Bidding, Pricing, and User Subscription Dynamics in Asymmetric-Valued Korean LTE Spectrum Auction: A Hierarchical Dynamic Game Approach

  • Jung, Sang Yeob;Kim, Seong-Lyun
    • Journal of Communications and Networks
    • /
    • v.18 no.4
    • /
    • pp.658-669
    • /
    • 2016
  • The tremendous increase in mobile data traffic coupled with fierce competition in wireless industry brings about spectrum scarcity and bandwidth fragmentation. This inevitably results in asymmetric-valued long term evolution (LTE) spectrum allocation that stems from different timing for twice improvement in capacity between competing operators, given spectrum allocations today. This motivates us to study the economic effects of asymmetric-valued LTE spectrum allocation. In this paper, we formulate the interactions between operators and users as a hierarchical dynamic game framework, where two spiteful operators simultaneously make spectrum acquisition decisions in the upper-level first-price sealed-bid auction game, and dynamic pricing decisions in the lower-level differential game, taking into account user subscription dynamics. Using backward induction, we derive the equilibrium of the entire game under mild conditions. Through analytical and numerical results, we verify our studies by comparing the latest result of LTE spectrum auction in South Korea, which serves as the benchmark of asymmetric-valued LTE spectrum auction designs.

Analysis on 3G Mobile Spectrum Charges by International Comparison (국제간 비교를 통한 3세대 이동통신 주파수 할당대가 분석)

  • Kim, Tae-Sung;Kim, Min-Jeong;Jun, Hyo-Jung
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.34 no.11B
    • /
    • pp.1261-1271
    • /
    • 2009
  • Emergence of new mobile communication services has generated new demand for spectrum. Because spectrum is a scarce public resource, demand for spectrum would exceed supply. As the demand for spectrum grows, the spectrum management policy becomes one of the most important issues in mobile telecommunications industry. Huge license charges for spectrum usage may obstruct the growth of mobile telecommunications industry. We analyze spectrum charges by international comparison for the case of 3G mobile telecommunication spectrum assignment. There are mainly two types of methods in spectrum assignment of 3G service, one is the auction and the other is the beauty contest. This article aims to analyze factors which influence on spectrum charges and to study the characteristic of spectrum charges of some selected countries. This study suggests the multiple regression model about spectrum charges.

Technology and Policy for Blockchain-based Spectrum Sharing (블록체인 기반의 전파 공유 기술과 전파 정책)

  • Shin, Na Yeon;Nam, Ji-Hyun;Choi, Ye Jin;Lee, Il-Gu
    • Journal of Digital Convergence
    • /
    • v.17 no.10
    • /
    • pp.13-21
    • /
    • 2019
  • The restricted network or the unbalanced distribution of spectrum is causing the problems of lack of spectrum resources and deterioration of the service quality. In addition, the existing centralized radio sharing method has not been a fundamental solution for radio sharing and is inefficient in terms of cost, convenience, and security. In this paper, we propose a blockchain-based spectrum sharing as a low-cost, trustworthy, high-efficiency platform that can distribute and share spectrum resources, and propose policies to realize this. In the spectrum sharing platform, spectrum information about Wi-Fi AP and LTE mobile hotspot is registered in the blockchain, and spectrum sharers and users can conclude peer-to-peer spectrum sharing contract quickly and efficiently through smart contract. The pay for the shared spectrum resources and reward for spectrum quality management open platform ecosystem to activate the circulation-sharing and it can provide a convenient and efficient public wireless infrastructure.

An Improved Cross Entropy-Based Frequency-Domain Spectrum Sensing (Cross Entropy 기반의 주파수 영역에서 스펙트럼 센싱 성능 개선)

  • Ahmed, Tasmia;Gu, Junrong;Jang, Sung-Jeen;Kim, Jae-Moung
    • Journal of the Institute of Electronics Engineers of Korea TC
    • /
    • v.48 no.3
    • /
    • pp.50-59
    • /
    • 2011
  • In this paper, we present a spectrum sensing method by exploiting the relationship of previous and current detected data sets in frequency domain. Most of the traditional spectrum sensing methods only consider the current detected data sets of Primary User (PU). Previous state of PU is a kind of conditional probability that strengthens the reliability of the detector. By considering the relationship of the previous and current spectrum sensing, cross entropy-based spectrum sensing is proposed to detect PU signal more effectively, which has a strengthened performance and is robust. When previous detected signal is noise, the discriminating ability of cross entropy-based spectrum sensing is no better than conventional entropy-based spectrum sensing. To address this problem, we propose an improved cross entropy-based frequency-domain spectrum sensing. Regarding the spectrum sensing scheme, we have derived that the proposed method is superior to the cross entropy-based spectrum sensing. We proceed a comparison of the proposed method with the up-to-date entropy-based spectrum sensing in frequency-domain. The simulation results demonstrate the performance improvement of the proposed spectrum sensing method.

Policy Agendas for the Efficient Use of Public and Broadcast Spectrum (공공 및 방송주파수의 효율적 이용을 위한 정책 과제)

  • Yeon, Kwon-Hum;Kim, Yongkyu
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.24 no.8
    • /
    • pp.849-859
    • /
    • 2013
  • This paper explores the policy alternatives to promote efficient use of spectrums for public use and terrestrial broadcasting, which are essential to provide spectrum for mobile broadband services. To this end, recent overseas spectrum management policies are introduced and utilized to provide domestic policy alternatives. For the efficient use of spectrum for public use, policy alternatives such as detailed survey of current usage of spectrum for public use, levying the opportunity cost, installment of spectrum efficiency fund, providing incentives for the efficient use of spectrum for military use, and introduction of shared use are proposed. For the efficient use of spectrum for terrestrial broadcasting, short-term policy alternative such as change of contribution rate base of the broadcasting - telecommunications development fund is proposed. For long-term policy alternatives, change of spectrum provision from designation to allocation for the spectrum for commercial terrestrial broadcasting and introduction of administered incentive pricing to public terrestrial broadcasting are proposed.

A Channel Allocation Scheme Based on Spectrum Hole Prediction in Cognitive Radio Wireless Networks (무선인지 통신망에서 스펙트럼 홀 예측에 의한 채널할당)

  • Lee, Jin-yi
    • The Journal of Advanced Navigation Technology
    • /
    • v.19 no.4
    • /
    • pp.318-322
    • /
    • 2015
  • In wireless communication networks, most of the prediction techniques are used for predicting the amount of resource required by user's calls for improving their demanding quality of service. However, we propose a channel allocation scheme based on predicting the resources of white spectrum holes for improving the QoS of rental user's spectrum handoff calls for cognitive radio networks in this paper. This method is supported by Wiener predictor to predict the amount of white spectrum holes of license user's free spectrum resources. We classify rental user's calls into initial calls and spectrum handoff calls, and some portion of predicted spectrum-hole resources is reserved for spectrum handoff calls' priority allocation. Simulations show that the performance of the proposed scheme outperforms in spectrum handoff call's dropping rate than an existing method without spectrum hole prediction(11% average improvement in 50% reservation).