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arXiv 0912.4087cs.NI
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Ad Hoc认知无线电网络的连通性和多跳时延

On the Connectivity and Multihop Delay of Ad Hoc Cognitive Radio Networks

Wei Ren, Qing Zhao, Ananthram Swami

摘要:

我们分析了adhoc认知无线电网络的多跳时延,其中每跳的传输时延由传播延迟和通信信道可用的等待时间(即,在该跳处频谱机会的出现)。利用连续渗流和遍历性的理论和方法,建立了认知无线电网络中最小多跳时延与源-目的距离的缩放定律。当传播延迟是可以忽略不计的,我们表现出截然不同的缩放行为的最小多跳延迟在瞬时连接的网络相比,只是间歇性连接,由于频谱的机会稀缺的网络。具体来说,如果网络是瞬时连接的,最小多跳延迟是渐近独立的距离;如果网络只是间歇连接,最小多跳延迟与距离成线性比例。当传播延迟是不可忽略的,但很小,我们表明,虽然缩放顺序总是线性的,缩放率为瞬时连接的网络可以是一个数量级小于一个间歇性连接的网络。

英文摘要:

We analyze the multihop delay of ad hoc cognitive radio networks, where the transmission delay of each hop consists of the propagation delay and the waiting time for the availability of the communication channel (i.e., the occurrence of a spectrum opportunity at this hop). Using theories and techniques from continuum percolation and ergodicity, we establish the scaling law of the minimum multihop delay with respect to the source-destination distance in cognitive radio networks. When the propagation delay is negligible, we show the starkly different scaling behavior of the minimum multihop delay in instantaneously connected networks as compared to networks that are only intermittently connected due to scarcity of spectrum opportunities. Specifically, if the network is instantaneously connected, the minimum multihop delay is asymptotically independent of the distance; if the network is only intermittently connected, the minimum multihop delay scales linearly with the distance. When the propagation delay is nonnegligible but small, we show that although the scaling order is always linear, the scaling rate for an instantaneously connected network can be orders of magnitude smaller than the one for an intermittently connected network.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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