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Spectrum handoff model based on preemptive queuing theory in cognitive radio networks

Yang Xiao-Long Tan Xue-Zhi Guan Kai

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Spectrum handoff model based on preemptive queuing theory in cognitive radio networks

Yang Xiao-Long, Tan Xue-Zhi, Guan Kai
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  • Cognitive radio can significantly improve spectrum efficiency by temporarily sharing under-utilized licensed frequency with primary users. Its spectrum management framework consists of four parts: spectrum sensing, spectrum decision, spectrum sharing and spectrum handoff. The last part is what we focus on in this paper. Spectrum handoff, which aims at guaranteeing requirement for service of secondary users and shortening time delay produced by interruption from primary users, is an important functionality of cognitive radio networks. For solving the problem of optimizing the extended data delivery time, a spectrum handoff model is proposed based on the preemptive resume priority M/G/m queuing theory. In order to minimize the extended data delivery time, the queuing method with mixed queuing and parallel service is adopted. In this model, each channel has its own high-priority queue and there is only one low-priority queue for all secondary users. The primary and secondary users respectively enter into the high-priority and low-priority queue to establish corresponding primary connections and secondary connections and execute corresponding data transmission. On the above basis, secondary users’ channel usage behaviors are thoroughly analyzed in the cases of multiple secondary users, multiple licensed channels and multiple spectrum handoffs. In this process, when multiple interruptions occur, the secondary user will stay on the current channel and suspend data transmission until primary users finish their data transmission, otherwise the secondary user will switch from the current channel to the predetermined target channel to resume his unfinished data transmission. The target channel is sequentially obtained from the target channel sequence, which is determined by channel parameter estimation algorithm. Based on the analysis of channel usage behaviors for secondary users, the total time delay caused by spectrum handoffs within the whole data transmission process is derived first. The total time delay can be deduced from two scenarios. One is that the target channel is the current channel. For this reason, the total time delay equals transmission time of primary users in high-priority queue. Obviously, the other is that the target channel is not the current channel. Thus, the total time delay equals the sum of transmission times of primary users in high-priority and secondary users ahead in low-priority. In addition, appearance of new primary users should also be considered in the data transmission process. Then, expressions of the extended data delivery time in two different cases (i. e. always-staying strategy and always-changing strategy) are respectively derived. Furthermore, the adaptive spectrum handoff strategy is finally discussed, which is to choose the optimal scheme from always-staying and always-changing strategy when a spectrum handoff happens. Simulation results verify that this model can not only describe handoff behaviors of secondary users more perfectly, but also can make the transmission time delay smaller and make the extended data delivery time shorter than the existing spectrum handoff model. Especially, with the increase of service intensity of primary users, the advantages of the proposed spectrum handoff model are more outstanding. In addition, the allowable secondary user service intensity is improved and the receptive number of secondary user is increased in cognitive radio networks. All in all, the proposed spectrum handoff model improves the performance of spectrum handoff, increases the capacity of cognitive radio networks and optimally realizes spectrum sharing between secondary users and primary users.
    • Funds: Project supported by the National Natural Science Foundation of China (Grant No. 61071104), and the National Science and Technology Major Project of the Ministry of Science and Technology of China (Grant No. 2011ZX03004-006).
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    Romero J, Sallent O, Umbert A 2013 IEEE 24th International Symposium on Personal Indoor and Mobile Radio Communications London, United Kingdom Sept. 8-11, 2013 p2512

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    Li C P, Neely M J 2011 IEEE International Symposium on Modeling and Optimization in Mobile, Ad Hoc and Wireless Networks Princeton, New Jersey May 9-13, 2011 p401

    [16]

    Xu Y H, Anpalagan A, Wu Q H, Shen L, Gao Z, Wang J L 2013 IEEE Commun. Surveys Tut. 15 1689

    [17]

    Li X, Zhao Q H, Guan X H, Tong L 2011 IEEE J. Sel. Areas Commun. 29 746

    [18]

    Nejatian S, Syed-Yusof S K, Latiff N M A, Asadpour V 2013 IEEE 24th International Symposium on Personal Indoor and Mobile Radio Communications London, United Kingdom Sept. 8-11, 2013 p2887

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    Liu J, Chen W, Cao Z, Zhang Y J 2012 IET Communications 6 945

    [20]

    Wang J, Huang A P, Wang W, Quek T Q S 2013 IEEE Wireless Commun. Lett. 2 175

    [21]

    Wang L C, Wang C W, Chang C J 2012 IEEE Trans. Mobile Comput. 11 1499

    [22]

    Wang C W, Wang L C 2012 IEEE J. Sel. Areas Commun. 30 2016

    [23]

    Liu Y, Tamma B R, Manoj B S, Rao R 2010 INFOCOM IEEE Conference on Computer Communications Workshops San Diego, USA March 15-19, 2010 p1

    [24]

    Wu C, Jiang H, You X J 2014 Acta Phys. Sin. 63 088801 (in Chinese) [伍春, 江虹, 尤晓建 2014 物理学报 63 088801]

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    Bose S K 2002 An Introduction to Queuing Systems (New York: Kluwer Academic/Plenum) pp168-169

  • [1]

    Wang B B, Liu K J R 2011 IEEE J. Sel. Topics Signal Process. 5 5

    [2]

    Wang L C, Wang C W, Chang C J 2012 IEEE Trans. Commun. 60 2444

    [3]

    Li Q C, Niu H N, Papathanassiou A T, Wu G 2014 IEEE Veh. Technol. Mag. 9 71

    [4]

    Bhushan N, Li J Y, Malladi D, Gilmore R, Brenner D, Damnjanovic A, Sukhavasi R, Patel C, Geirhofe S 2014 IEEE Commun. Mag. 52 82

    [5]

    Zu Y X, Zhou J, Zeng C C 2010 Chin. Phys. B 19 119501

    [6]

    Zhang X J, Lu Y, Tian F, Sun Z X, Cheng X F 2014 Acta Phys. Sin. 63 078401 (in Chinese) [张学军, 鲁友, 田峰, 孙知信, 成谢锋 2014 物理学报 63 078401]

    [7]

    Zu Y X, Zhou J 2012 Chin. Phys. B 21 019501

    [8]

    Gavrilovska L, Atanasovski V, Macaluso I, DaSilva L A 2013 IEEE Commun. Surveys Tut. 15 1761

    [9]

    Qi P H, Li Z, Si J B, Gao R 2014 Chin. Phys. B 23 128401

    [10]

    Bansal T, Li D, Sinha P 2014 IEEE Trans. Mobile Comput. 13 852

    [11]

    Chai Z Y, Wang B, Li Y L 2014 Acta Phys. Sin. 63 228802 (in Chinese) [柴争义, 王秉, 李亚伦 2014 物理学报 63 228802]

    [12]

    Christian I, Moh S, Chung I, Lee J Y 2012 IEEE Commun. Mag. 50 114

    [13]

    Msumba J A, Xu H 2013 IEEE Africon 2013 Mauritius, Sept. 9-12, 2013 p1

    [14]

    Romero J, Sallent O, Umbert A 2013 IEEE 24th International Symposium on Personal Indoor and Mobile Radio Communications London, United Kingdom Sept. 8-11, 2013 p2512

    [15]

    Li C P, Neely M J 2011 IEEE International Symposium on Modeling and Optimization in Mobile, Ad Hoc and Wireless Networks Princeton, New Jersey May 9-13, 2011 p401

    [16]

    Xu Y H, Anpalagan A, Wu Q H, Shen L, Gao Z, Wang J L 2013 IEEE Commun. Surveys Tut. 15 1689

    [17]

    Li X, Zhao Q H, Guan X H, Tong L 2011 IEEE J. Sel. Areas Commun. 29 746

    [18]

    Nejatian S, Syed-Yusof S K, Latiff N M A, Asadpour V 2013 IEEE 24th International Symposium on Personal Indoor and Mobile Radio Communications London, United Kingdom Sept. 8-11, 2013 p2887

    [19]

    Liu J, Chen W, Cao Z, Zhang Y J 2012 IET Communications 6 945

    [20]

    Wang J, Huang A P, Wang W, Quek T Q S 2013 IEEE Wireless Commun. Lett. 2 175

    [21]

    Wang L C, Wang C W, Chang C J 2012 IEEE Trans. Mobile Comput. 11 1499

    [22]

    Wang C W, Wang L C 2012 IEEE J. Sel. Areas Commun. 30 2016

    [23]

    Liu Y, Tamma B R, Manoj B S, Rao R 2010 INFOCOM IEEE Conference on Computer Communications Workshops San Diego, USA March 15-19, 2010 p1

    [24]

    Wu C, Jiang H, You X J 2014 Acta Phys. Sin. 63 088801 (in Chinese) [伍春, 江虹, 尤晓建 2014 物理学报 63 088801]

    [25]

    Bose S K 2002 An Introduction to Queuing Systems (New York: Kluwer Academic/Plenum) pp168-169

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Publishing process
  • Received Date:  24 September 2014
  • Accepted Date:  08 December 2014
  • Published Online:  05 May 2015

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