Due to the recent developments in the wireless mesh and ad-hoc networks, multi-hop cognitive radio networks (MCRNs) have attained the significant attention towards providing the reliable multimedia communications. However, in reliable multimedia communications each multimedia application observed a very stringent quality-of-service (QoS) requirements. Moreover, in MCRNs, channel allocated to the multimedia secondary users (MSUs) can be re-occupied by the primary users (PUs) at any time which causes the end-to-end path discontinuity that severely affect the performance of the MCRNs. Therefore, under the dynamic channel availability, selecting an end-to-end path that is not only stable but also fulfills the QoS requirements of the real time and multimedia (RM) applications is a challenging task and still an open research problem. Hence, in this paper, we propose a cross-layer routing scheme that supports adaptive bit-rate multimedia (ABM) transmissions over MCRNs. Moreover, our path selection is based on the QoS-aware end-to-end path delay, and PU-activity aware end-to-end path stability metrices. Furthermore, to avoid the PU interference, continuity in transmission, efficient channel utilization, and supporting error resilience over time varying wireless channels our selected end-to-end path is periodically updated. Simulation study shows that the proposed scheme is more robust and suitable for supporting ABM over MCRNs.

中文翻译：

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使用跨层路由方法在认知无线电网络上进行自适应比特率视频传输

由于无线网状网络和自组织网络的最新发展，多跳认知无线电网络（MCRN）在提供可靠的多媒体通信方面受到了极大的关注。然而，在可靠的多媒体通信中，每个多媒体应用都遵守非常严格的服务质量 (QoS) 要求。此外，在 MCRN 中，分配给多媒体辅助用户 (MSU) 的信道随时可能被主用户 (PU) 重新占用，从而导致端到端路径不连续，严重影响 MCRN 的性能。因此，在动态信道可用性下，选择既稳定又满足实时和多媒体 (RM) 应用 QoS 要求的端到端路径是一项具有挑战性的任务，仍然是一个开放的研究问题。因此，在本文中，我们提出了一种跨层路由方案，该方案支持通过 MCRN 进行自适应比特率多媒体 (ABM) 传输。此外，我们的路径选择基于 QoS 感知的端到端路径延迟和 PU 活动感知的端到端路径稳定性度量。此外，为了避免 PU 干扰、传输的连续性、有效的信道利用以及支持随时间变化的无线信道的错误恢复，我们选择的端到端路径会定期更新。仿真研究表明，所提出的方案更健壮，更适合在 MCRN 上支持 ABM。此外，为了避免 PU 干扰、传输的连续性、有效的信道利用以及支持随时间变化的无线信道的错误恢复，我们选择的端到端路径会定期更新。仿真研究表明，所提出的方案更健壮，更适合支持 ABM 而不是 MCRN。此外，为了避免 PU 干扰、传输的连续性、有效的信道利用以及支持随时间变化的无线信道的错误恢复，我们选择的端到端路径会定期更新。仿真研究表明，所提出的方案更健壮，更适合在 MCRN 上支持 ABM。