適用於感知無線電網路的無線跳頻方式

A channel hopping scheme in cognitive radio networks

陳浩宇(Hao-yu Chen)

指導教授 ： 張貴雲

國立中央大學/資訊電機學院/資訊工程學系/碩士(2012年)

摘要

在無線感知網路（Cognitive radio networks）中，允許次要使用者(Secondary user)能在不干擾合法使用者的情況下使用已被註冊的頻譜。次要使用們能透過相會(rendezvous)在一個不被合法使用者所佔用的頻道上建立通訊鏈結以達到媒體存取控制（Media Access Control）。
由於使用共同控制頻道的方式可能遇到嚴重的控制頻道阻斷問題(CR long-time blocking problem)及控制頻道壅塞問題(control channel saturation problem)。許多使用無線跳頻(channel hopping)的方法因為能有效避免這兩種問題發生而被提出。然而，不同的次要使用者間彼此感知到的頻譜狀況亦不盡相同進而造成了無線跳頻序列設計的困難。
在本篇論文中，我們將次要使用者間彼此頻譜可用狀況的不對稱性加入無線跳頻序列設計的考量，並且在基於SARCH(Symmetric Asynchronous Rendezvous Couple Channel Hopping)媒體存取控制協定中提出兩種改良方式進而能夠讓次要使用者間相會在一個不被合法使用者所佔用的頻道所需的時間大幅縮短。相較於過去所提出的作法，我們的做法在不同的網路環境中皆能達到較佳的效能。

關鍵字

可用頻道集合 ； 感知無線電 ； 無線跳頻技術 ； 媒體存取控制層 ； 非同步架構

並列摘要

In cognitive radio networks (CRNs), Secondary user (SU) can opportunistically access the channels which should not interfere the co-locate incumbent networks. SUs can through the rendezvous process on an incumbent free channel to establish communication link for medium access control.
Due to common control channel approaches may face serious CR long-time blocking problem and control channel saturation problem. Channel hopping based approaches are one way which can avoid these two problems. However, each SU have its own view of the spectrum availability, this non-uniform spectrum availability imposes special design challenges for channel hopping sequence.
In this paper, we focus on the channel hopping sequence design which take the non-uniform spectrum availability between SUs into consideration, and provide two enhance approaches based on SARCH MAC protocol achieving an upper bound to the time to rendezvous (TTR) on an incumbent free channel. Compared with previous works, our schemes outperform the performance under various network conditions.

並列關鍵字

available set ； Asynchronous ； MAC ； Channel Hopping ； Cognitive Radio

參考文獻

[1] Y. Zhang and B. Wang, “ETCH: Efficient Channel Hopping for Communication Rendezvous in Dynamic Spectrum Access Networks,” in Proc. IEEE International Conference on Computer Communications (INFOCOM), 2011.

[2] K. Bian, J. Park, and R. Chen, “A Quorum-based Framework for Establishing Control Channels in Dynamic Spectrum Access Networks,” in Proc. ACM International Conference on Mobile Computing and Networking (MobiCom), 2009.

[3] J. Zhao, H. Zheng, and G. H. Yang, “Distributed Coordination in Dynamic Spectrum Allocation Networks,” in Proc. IEEE Symposium on New Frontiers in Dynamic Spectrum Access Networks (DySPAN), 2005.

[5] Z. Lin and H. Liu, “Jump-Stay Based Channel-hopping Algorithm with Guaranteed Rendezvous for Cognitive Radio Networks,” in Proc. IEEE International Conference on Computer Communications (INFOCOM), 2011.

[6] C. F. Shih, T. Y. Wu and W. Liao, “DH-MAC: A Dynamic Channel Hopping MAC Protocol for Cognitive Radio Networks,” in Proc. IEEE International Conference on Communications (ICC), 2010.