• 제목/요약/키워드: Spectrum sharing model

검색결과 39건 처리시간 0.028초

A Spectrum Sharing Model for Compatibility between IMT-Advanced and Digital Broadcasting

  • Hassan, Walid A.;Rahman, Tharek Abd
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제6권9호
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    • pp.2073-2085
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    • 2012
  • Recently, the International Telecommunication Union allocated the 470-862 MHz band to the digital broadcasting (DB) service. Moreover, the 790-862 MHz sub-band will be allocated to the next-generation mobile system, known as the International Mobile Telecommunication - Advanced (IMT-A), and to the DB on a co-primary basis in the year 2015. Currently, two candidate technologies are available to represent the IMT-A system; the Mobile WiMAX and Long Term Evolution - Advanced (LTE-A). One of the main criteria of the IMT-A candidate is to not cause additional interference to the primary service (i.e., DB). In this paper, we address the spectrum sharing issue between the IMT-A candidates and the DB service. More precisely, we investigate the interference effect between the DB service and the mobile network, which could be either LTE-A or WiMAX. Our study proposes a spectrum sharing model to take into account the impact of interference and evaluates the spectrum sharing requirements such as frequency separation and separation distance. This model considers three spectrum sharing scenarios: co-channel, zero guard band, and adjacent channel. A statistical analysis is performed, by considering the interferer spectrum emission mask and victim receiver blocking techniques. The interference-to-noise ratio is used as an essential spectrum sharing criterion between the systems. The model considers the random distribution of the users, antenna heights, and the bandwidth effect as well as the deployment environment in order to achieve spectrum sharing. The results show that LTE-A is preferable to WiMAX in terms of having less interference impact on DB; this can eventually allow the operation of both services without performance degradation and thus will lead to efficient utilization of the radio spectrum.

Performance Analysis of Dynamic Spectrum Allocation in Heterogeneous Wireless Networks

  • Ha, Jeoung-Lak;Kim, Jin-Up;Kim, Sang-Ha
    • ETRI Journal
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    • 제32권2호
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    • pp.292-301
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    • 2010
  • Increasing convergence among heterogeneous radio networks is expected to be a key feature of future ubiquitous services. The convergence of radio networks in combination with dynamic spectrum allocation (DSA) could be a beneficial means to solve the growing demand for radio spectrum. DSA might enhance the spectrum utilization of involved radio networks to comply with user requirements for high-quality multimedia services. This paper proposes a simple spectrum allocation algorithm and presents an analytical model of dynamic spectrum resource allocation between two networks using a 4-D Markov chain. We argue that there may exist a break-even point for choosing whether or not to adopt DSA in a system. We point out certain circumstances where DSA is not a viable alternative. We also discuss the performance of DSA against the degree of resource sharing using the proposed analytical model and simulations. The presented analytical model is not restricted to DSA, and can be applied to a general resource sharing study.

Adaptive Cooperative Spectrum Sharing Based on Fairness and Total Profit in Cognitive Radio Networks

  • Chen, Jian;Zhang, Xiao;Kuo, Yonghong
    • ETRI Journal
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    • 제32권4호
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    • pp.512-519
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    • 2010
  • A cooperative model is presented to enable sharing of the spectrum with secondary users. Compared with the optimal model and competitive model, the cooperative model could reach the maximum total profit for secondary users with better fairness. The cooperative model is built based on the Nash equilibrium. Then a conceding factor is introduced so that the total spectrum required from secondary users will decrease. It also results in a decrease in cost which the primary user charges to the secondary users. The optimum solution, which is the maximum total profit for the secondary users, is called the collusion state. It is possible that secondary users may leave the collusion state to pursue the maximum of individual profit. The stability of the algorithm is discussed by introducing a vindictive factor to inhabit the motive of deviation. In practice, the number of secondary users may change. Adaptive methods have been used to deal with the changing number of secondary users. Both the total profit and fairness are considered in the spectrum allocating. The shared spectrum is 11.3893 with a total profit of 65.2378 in the competitive model. In the cooperative model, the shared spectrum is 8.5856 with the total profit of 73.4963. The numerical results reveal the effectiveness of the cooperative model.

An Integrated Game Theoretical Approach for Primary and Secondary Users Spectrum Sharing in Cognitive Radio Networks

  • Kim, Jong-Gyu;Nguyen, Khanh-Huy;Lee, Jung-Tae;Hwang, Won-Joo
    • 한국멀티미디어학회논문지
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    • 제14권12호
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    • pp.1549-1558
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    • 2011
  • In this paper, we address the problem of bandwidth sharing among multiple primary users and multiple secondary users in a cognitive radio network. In cognitive radio networks, effective spectrum assignment for primary and secondary users is a challenge due to the available broad range of radio frequency spectrum as well as the requisition of harmonious coexistence of both users. To handle this problem, firstly, Bertrand game model is used to analyze a spectrum pricing in which multiple primary users emulate with each other to acquire maximal profit. After that, we employ Cournot game to model the spectrum sharing of secondary users to obtain optimal profit for each user also. Simulation results show that our scheme obtains optimal solution at Nash equilibrium.

CR 넷워크를 위한 주파수 감지에 기번한 적응적인 전력 제어 전략 (Adaptive Power Control Strategy based on Spectrum Sensing for Cognitive Relay Networks)

  • 호사원;조인휘
    • 한국정보처리학회:학술대회논문집
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    • 한국정보처리학회 2019년도 춘계학술발표대회
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    • pp.82-85
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    • 2019
  • An adaptive power control scheme is proposed for the cognitive relay networks with joint overlay and underlay spectrum sharing model. The transmit power of the secondary user is adjusted adaptively according to the spectrum sensing results and the interference channel condition. The outage probability of the secondary user is compared by Monte - Carlo simulations between the fixed power control scheme and pure overlay or underlay spectrum sharing schemes. The results show that, by employing the adaptive power control strategy, the interference probability of the secondary user to the primary user is decreased by 70 % ~ 80 % under the same outage probability. Also, the outage probability of the secondary user is reduced by 1 ~ 2 orders of magnitude under the same interference probability. Thus, the performance of the spectrum sharing is improved effectively.

주파수 공유를 고려한 전파자원 이용효율 측정 방안 (Measurement of Spectrum Utilization Efficiency Considering Spectrum Sharing)

  • 김태한;박현민;성기원
    • 한국콘텐츠학회논문지
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    • 제14권9호
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    • pp.589-597
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    • 2014
  • 전파자원을 이용한 다양한 무선 서비스에 대한 급증하는 수요는 더 많은 주파수 자원의 확보를 요구한다. 그러나 주파수 자원의 희소성과 고대역 주파수 발굴의 어려움을 감안하면, 늘어나는 전파자원의 수요를 충족시킬 수 있는 유일한 방법은 기존 전파자원의 이용 효율을 극대화시키는 것이다. 이러한 상황에서, 전파자원에 대한 초과 수요를 해결하기 위한 다양한 주파수 공유 방안이 최근 활발히 논의되고 있다. 이와 더불어, 주파수 공유의 실효성 검증과 무선시스템의 성과 예측을 위해, 주파수 이용효율 측정의 중요성이 높아지고 있다. 본 연구에서는 전파자원 이용효율의 합리적 측정 방법을 제안한다. 국제전기통신연합(ITU) 권고안을 토대로 전파자원 이용효율의 다양한 측정 방법을 고찰하고, 대기행렬모형을 이용한 전파 자원 이용효율 측정의 대안 모델을 제시한다. 이를 통해, 주파수 공유 시 전파자원의 이용효율이 어느 정도 증대되는지를 합리적으로 예측할 수 있다.

공동사용주파수의 사회경제적 가치분석 (A Socio-Economic Value Analysis of Sharing Spectrum in Korea)

  • 박석지;김창주;박덕규
    • 한국전자파학회논문지
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    • 제24권8호
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    • pp.831-840
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    • 2013
  • 본 논문에서는 주파수의 공동 사용을 위한 서비스 및 그 사회경제적 가치를 분석하였다. 이를 위해 주파수 공동 사용의 개념과 방식을 제시하고, 공동 사용 주파수의 사회경제적 가치분석을 위해 전문가 조사를 실시하였다. 국내에서 이용할 수 있는 1.4~4.5 GHz 대역에서 도출된 910 MHz의 후보 대역별로 적용 가능한 서비스의 경제적 가치와 사회적 파급 효과를 분석하였다. 이 분석 결과를 토대로 공동사용 주파수 대역에 적합한 주파수를 많이 필요로 하는 서비스로서, 이동 통신, WiFi(이동 통신 off-loading 포함), ASA, 공공서비스, M2M, smart home/factory 서비스를 제시하였다.

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)
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    • 제9권1호
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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.

A Dynamic QoS Model for improving the throughput of Wideband Spectrum Sharing in Cognitive Radio Networks

  • Manivannan, K.;Ravichandran, C.G.;Durai, B. Sakthi Karthi
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제8권11호
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    • pp.3731-3750
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    • 2014
  • This paper considers a wideband cognitive radio network (WCRN) which can simultaneously sense multiple narrowband channels and thus aggregate the detected available channels for transmission and studies the ergodic throughput of the WCRN that operated under: the wideband sensing-based spectrum sharing (WSSS) scheme and the wideband opportunistic spectrum access (WOSA) scheme. In our analysis, besides the average interference power constraint at PU, the average transmit power constraint of SU is also considered for the two schemes and a novel cognitive radio sensing frame that allows data transmission and spectrum sensing at the same time is utilized, and then the maximization throughput problem is solved by developing a gradient projection method. Finally, numerical simulations are presented to verify the performance of the two proposed schemes.

AHP를 이용한 주파수 공유 비즈니스 모델 평가방법 설계 (Design of Evaluation Method for Business Models Considering Spectrum Sharing using Analytic Hierarchy Process(AHP) Method)

  • 김태한;박현민
    • 한국콘텐츠학회논문지
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    • 제15권12호
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    • pp.525-533
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    • 2015
  • 주파수 공유 기술의 진화는 TV 유휴대역 활용과 같은 다양한 신규 비즈니스 모델의 출현을 불러일으킬 것으로 예상된다. 그런데 주파수 공유를 고려한 비즈니스 모델은 서비스 제공업체의 경제적 타당성을 충족시키고, 서비스 이용자에게는 이전 서비스보다 증가된 편익을 제공해야 한다. 이와 더불어, 신규 비즈니스 모델은 무선 통신 서비스 분야를 포함하여 산업 활성화에 기여해야 한다. 이러한 다양한 목적을 이룰 수 있는 최적 비즈니스 모델 선별에 적합한 정량적 평가방법이 필요하다. 평가방법에는 정부, 서비스 제공자, 서비스 이용자의 평가 관점이 골고루 반영되어야 한다. 본 연구는 주파수 공유 비즈니스 모델의 평가방법을 제시한다. 먼저 주파수 공유 기술 적용의 특수성을 고려한 평가속성과 평가척도를 정의한다. 또한 계층적 의사결정 분석기법(AHP)을 적용하여 평가속성 및 평가항목의 상대적 중요도를 도출한다.