计算机科学
认知无线电
会合
继电器
计算机网络
无线
吞吐量
频道(广播)
网络数据包
无线网络
延迟(音频)
电信
功率(物理)
物理
量子力学
工程类
航天器
航空航天工程
作者
Feng-Wen Lo,Guu-Chang Yang,Min-Kuan Chang,Wing C. Kwong
出处
期刊:IEEE Internet of Things Journal
[Institute of Electrical and Electronics Engineers]
日期:2023-05-29
卷期号:10 (20): 18346-18363
被引量:1
标识
DOI:10.1109/jiot.2023.3280716
摘要
In this article, two-hop transmissions in channel-hopping (CH) cognitive-radio wireless networks (CRWNs) with buffer-aided relays are studied. The two-hop relay (rendezvous) model is improved using symmetric CH sequences, which are more suitable for practical CRWNs than the old model using asymmetric ones. A proper buffer storage size in the relays is formulated to minimize the two-hop data-transfer latency. The lower and upper bounds of the steady-state maximum-time-to-rendezvous (MTTR) and throughput with relays are derived with formal proofs. Using the proper buffer size, both metrics can be better controlled and found no worse than twice the original MTTR and throughput without relays. To explore the impacts of utilization probability of Internet of Things (IoT) devices to their performances in a small-scale CRWN, the single-region rendezvous-success (RS) rate and throughput are formulated. For a large-scale CRWN, the model is extended to formulate the multiregion RS rate and throughput with and without relays for the first time. Numerical studies of these analytical models are performed and validated with computer simulations. In summary, the transmission range and number of rendezvousing IoT devices are improved in the large-scale CRWN with relays, and the multiregion RS rate and throughput with relays are found better than those without relays.
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