Towards Energy-Efficient Routing in Satellite Networks
Towards Energy-Efficient Routing in Satellite Networks
复制标题
实现卫星网络中的节能路由
DOI：
10.1109/jsac.2016.2611860
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发表时间：
2016-12
期刊：
影响因子：
--
通讯作者：
Yu Wang
中科院分区：
文献类型：
--
作者：
Yuan Yang;Mingwei Xu;Dan Wang;Yu Wang
由于卫星网络可以向地球上的任何地方提供各种服务，因此它正受到越来越多的关注。卫星上的通信设备通常由太阳能电池板和电池供电，这些电池经过精心设计，以保证电力供应并避免不足。然而，我们发现，无节制地使用能源会导致卫星迅速老化，因为电池单元的充电/放电次数是有限的。由于卫星成本极高，开发节能卫星路由以节省能源和延长卫星寿命已变得非常重要。本文对此进行了全面的研究。首先，我们建立了一个空间路由器的功耗，太阳能电池板供电，电池的老化正式。其次，我们定义了能量有效的卫星路由（EESR）问题，并证明了EESR问题是NP-难的。然后，我们开发了三个算法来逐步解决EESR问题。GreenSR-B是一种基线算法，它迭代计算链路成本，以计算使总充电/放电循环次数最小化的路由。GreenSR-A选择空间路由器切换到睡眠模式，以提高节能效果。GreenSR综合考虑了路径长度和最大链路利用率对能量效率和QoS的要求。我们评估我们的算法模拟低地球轨道卫星网络与真实的互联网使用痕迹。结果表明，GreenSR可以延长卫星电池的寿命超过40%，而路径长度增加很少，链路利用率很小。
Satellite networks are drawing more and more attention, since they can provide various services to everywhere on the earth. Communication devices in satellites are typically powered by solar panels and battery cells, which are carefully designed to guarantee power supply and avoid deficiency. However, we find that unrestrained use of energy will cause a satellite to age quickly, because the number of recharge/discharge of battery cells is limited. Due to the extremely high cost of satellites, the development of energy-efficient satellite routing to save energy and prolong satellite lifetimes has become significantly important. In this paper, we do comprehensive studies. First, we model the power consumption of a space router, power supply by solar panels, and aging of battery cells formally. Second, we define the energy-efficient satellite routing (EESR) problem, and prove that the EESR problem is NP-hard. Then, we develop three algorithms to gradually solve the EESR problem. GreenSR-B is a baseline algorithm which computes link costs iteratively to compute a routing that minimizes the total recharge/discharge cycle number. GreenSR-A selects space routers to switch into sleep mode to improve energy conservation. GreenSR jointly considers energy efficiency and QoS requirements of path length and the maximum link utilization ratio. We evaluate our algorithms by simulations on a low earth orbit satellite network with real Internet usage traces. The results show that GreenSR can prolong the lifetime of satellite battery cells by more than 40%, with little increment in path length and a small link utilization ratio.
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