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认知无线电是一种可以感知本地空闲频谱的获得性,并且利用可获得的空闲频谱进行通信的一种新兴技术。在一个由认知无线电节点组成的多跳网络中,由于空闲频谱随地点与时间的动态变化,使得各节点可获得的空闲信道的数目和属性不仅存在差异,且是不断变化的。这与现存的多信道接入系统有着根本的不同,在这些系统中,各节点使用的信道是相同和固定不变的(如Ad Hoc与802.11网络),以上使得认知无线电的MAC设计变得很困难。基于跳预约多址接入提出一种动态信道的跳预约多址接入(DC-HRMA)协议,在不需要公共信道的情况下,解决了信道有效接入与退让问题。
Cognitive radio is an emerging technology that can sense the availability of local free spectrum and make use of available free spectrum. In a multi-hop network composed of cognitive radio nodes, the number and attributes of free channels available to each node vary not only because of the dynamic changes of idle spectrum with locations and time, but also from time to time. This is fundamentally different from existing multi-channel access systems where the channels used by each node are the same and fixed (such as Ad Hoc and 802.11 networks), which makes the MAC design of cognitive radio become Very difficult. Based on hop reservation multiple access, a dynamic channel hop reservation multiple access (DC-HRMA) protocol is proposed to solve the problem of effective channel access and concession without the need of common channel.