A Review on Spectrum Mobility for Cognitive Radio Networks (original) (raw)
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A Survey on Spectrum Mobility in Cognitive Radio Network
International Journal of Computer Applications, 2015
Cognitive radio technology is an emerging technology which would enable a set of secondary users (SU) to opportunistically use the spectrum allocated to a primary user (PU) and has potential to serve as a solution to spectrum inefficiency and spectrum shortage problems. However, SUs face number of challenges based on the fluctuating nature of the available spectrum. When PU arrives on a specific frequency band, any SU occupying this band should free the channel for PUs which is referred as Spectrum Mobility. It is an important but unexplored event in cognitive radio network. This paper is a brief overview on the reason, mechanism, challenges and their solutions in spectrum mobility.
An efficient spectrum mobility management strategy in cognitive radio networks
2009
In this paper, we propose to design a spectrum mobility strategy using Fuzzy Logic System for cognitive radio networks (CRN). The proposed strategy enables cognitive radios (CR) to vacate the spectrum if primary user (PU) needs it back or to adjust its transmit power in order to avoid interference with PU or nearby CR. Using our scheme, CR switches between the bands only if it is not able to modify its transmit power within the tolerable interference limits. Thus, our work is divided in two modules, one with the priority to control CR transmit power within tolerable range and second to switch to another frequency band in order to avoid interference. Simulated results show that using our proposed fuzzy power control scheme, we can decrease transmit power consumption and achieve lower number of spectrum handovers.
Spectrum Aware Mobility Management In Cognitive Radio-A Survey
Cognitive radio (CR) enables the efficient utilization of the limited radio spectrum, network resources and an unlicensed user can communicate in licensed spectrum without interfering a licensed user. In CR expected to address several operational challenges such as spectrum access in dynamic manner, providing Quality of Service (QOS) between end-to-end and spectral heterogeneity. Hence it become an all-encompassing term for a wide variety of technologies and emerges as a promising solution to improve current spectrum utilization efficiently. In this paper we proposed spectrum mobility management in cognitive radio.
Spectrum Mobility in Cognitive Radio
International Journal of Engineering Research and, 2020
Cognitive radio networks gives a powerful solution for spectrum shortage problem using powerful spectrum access. So in highly powerful network, the user other than primary communication is mostly break, spectrum mobility is a powerful tool for enabling continuous Secondary User data transfer. Namely, Secondary User performs spectrum handoff by transmission ongoing communication to a void channel. This paper provide some important points of spectrum mobility in Cognitive radio networks. Comparing of various handoff policy is considered concerning handoff latency. And important designs and related research challenges are also discussed.In this we discussed some policy of transmission their advantages and disadvantages. We also discussed current issues in spectrum mobility.And at the application and further use is discusses. We have therefore created a user interface (UI) for the successful transmission of secondary user frequency to black holes or empty holes.
Improved spectrum mobility using virtual reservation in collaborative cognitive radio networks
2013 IEEE Symposium on Computers and Communications (ISCC), 2013
Cognitive radio technology would enable a set of secondary users (SU) to opportunistically use the spectrum licensed to a primary user (PU). On the appearance of this PU on a specific frequency band, any SU occupying this band should free it for PUs. Typically, SUs may collaborate to reduce the impact of cognitive users on the primary network and to improve the performance of the SUs. In this paper, we propose and analyze the performance of virtual reservation in collaborative cognitive networks. Virtual reservation is a novel link maintenance strategy that aims to maximize the throughput of the cognitive network through full spectrum utilization. Our performance evaluation shows significant improvements not only in the SUs blocking and forced termination probabilities but also in the throughput of cognitive users.
2015
Cognitive radio is one of the technologies which has the potential to improve the spectrum utilization and network performance. Spectrum Mobility is an indispensable component in cognitive radio network that not only guarantees desired QoS of primary users but also grants resilient service for secondary users. Spectrum Mobility occurs when the primary user appears in the licensed band occupied by secondary user and it is used to avoid interference between primary and secondary users. This paper provides a systematic current overview of spectrum mobility process, various performance metrics and challenges regarding spectrum mobility are pointed out and finally a number of promising concepts and schemes are briefly presented.
Spectrum-Aware Mobility Management in Cognitive Radio Cellular Networks
IEEE Transactions on Mobile Computing, 2012
Cognitive radio (CR) networks have been proposed as a solution to both spectrum inefficiency and spectrum scarcity problems. However, they face several challenges based on the fluctuating nature of the available spectrum, making it more difficult to support seamless communications, especially in CR cellular networks. In this paper, a spectrum-aware mobility management scheme is proposed for CR cellular networks. First, a novel network architecture is introduced to mitigate heterogeneous spectrum availability. Based on this architecture, a unified mobility management framework is developed to support diverse mobility events in CR networks, which consists of spectrum mobility management, user mobility management, and intercell resource allocation. The spectrum mobility management scheme determines a target cell and spectrum band for CR users adaptively dependent on time-varying spectrum opportunities, leading to increase in cell capacity. In the user mobility management scheme, a mobile user selects a proper handoff mechanism so as to minimize a switching latency at the cell boundary by considering spatially heterogeneous spectrum availability. Intercell resource allocation helps to improve the performance of both mobility management schemes by efficiently sharing spectrum resources with multiple cells. Simulation results show that the proposed method can achieve better performance than conventional handoff schemes in terms of both cell capacity as well as mobility support in communications.
Spectrum Handoff in Cognitive Radio Networks: A Survey
Oriental journal of computer science and technology, 2017
Cognitive radio (CR) is a promising solution to improve the spectrum utilization by enabling unlicensed users to exploit the spectrum in an opportunistic manner. Spectrum handoff is a different type of handoff in CR necessitated by the reappearance of primary user (PU) in the licensed band presently occupied by the secondary users (SUs). Spectrum handoff procedures aim to help the SUs to vacate the occupied licensed spectrum and find suitable target channel to resume the unfinished transmission. The purpose of spectrum mobility management in cognitive radio networks is to make sure that the transitions are made smoothly and rapidly such that the applications running on a cognitive user perceive minimum performance degradation during a spectrum handoff. In this paper, we will survey the literature on spectrum handoff in cognitive radio networks.
IJERT-Spectrum Mobility in Cognitive Radio
International Journal of Engineering Research and Technology (IJERT), 2020
https://www.ijert.org/spectrum-mobility-in-cognitive-radio https://www.ijert.org/research/spectrum-mobility-in-cognitive-radio-IJERTV9IS080163.pdf Cognitive radio networks gives a powerful solution for spectrum shortage problem using powerful spectrum access. So in highly powerful network, the user other than primary communication is mostly break, spectrum mobility is a powerful tool for enabling continuous Secondary User data transfer. Namely, Secondary User performs spectrum handoff by transmission ongoing communication to a void channel. This paper provide some important points of spectrum mobility in Cognitive radio networks. Comparing of various handoff policy is considered concerning handoff latency. And important designs and related research challenges are also discussed.In this we discussed some policy of transmission their advantages and disadvantages. We also discussed current issues in spectrum mobility.And at the application and further use is discusses. We have therefore created a user interface (UI) for the successful transmission of secondary user frequency to black holes or empty holes.