One inevitable problem in Ad Hoc networks is the limited battery capacity, which explains why portable devices might shut down suddenly when the power of hardware is depleted. Hence, how to decrease the power consumption is an important issue in ad hoc networks. With the development of wireless technology, mobile devices can transmit voices, surf the Internet, download entertaining stuffs, and even support some P2P applications, like sharing real-time streaming. In order to keep the quality stable, the transmission must be continuous and it is thus necessary to select some managers to coordinate all nodes in a P2P community. In addition to assigning jobs to the staffs (children) when needed, these managers (ancestors) are able to reappoint jobs in advance when employees retire. This paper proposed a mechanism called Cluster-based Power Management (CPM) to stabilize the transmissions and increase Time to Live (TTL) of mobile hosts. In our new proposed method, we establish the clusters according to every node's joining order and capability, and adjust their sleep time dynamically through three different mathematical models. Our simulation results reveal that this proposed scheme not only reduces the power consumption efficiently, but also increases the total TTLs evidently.
In P2P system, each peer caches the received data for accessing of other peers. In order to reduce server's workload and increase the utilization of the received data and the bandwidth of wireless network, for these reasons, a good cache replacement strategy plays an essential role. The traditional cache replacement strategies for P2P system include LRU (Least-Recently-Used), FIFO (First-In-First-Out), MRU (Most-Recently-Used)…etc. Those cache replacement strategies often consider time urgency and access frequency only. Indeed, they are popular and suitable for the common transmission of data. But in VoD (Video on Demand) system, the ability of the traditional cache replacement strategies seems not enough to satisfy the user's requirements of the video's quality. For this reason, we design a novel cache strategy called "C-LRU (Conditioned-LRU)". C-LRU not only takes access frequency, but also considers the quality of image.
In ad hoc networks, one inevitably serious problem is that the power of battery is not permanent which explains that portable devices perhaps shut down suddenly if the power of hardware is die out. Hence, how to decrease the power consumption is an important issue in ad hoc networks. With the development of wireless technology, mobile devices are not only permitted of transmitting voice, but also allowed to surf the Internet or download entertaining stuffs. Furthermore, it also can support some P2P applications such as sharing real-time streaming. In order to keep a stable quality, the transmission cannot break off unexpectedly which illustrates that it is necessary to select some managers to coordinate each node in a P2P community. Those managers can assign jobs to their staffs if needed. When employees retire, the managers can reappoint jobs in advance. In this paper, we proposed a mechanism called Cluster-based Power Management (CPM). The CPM could keep transmissions stable and increase Time to Live (TTL) of mobile hosts. In our new proposed method, we build the clusters according to the joined order and capability of each node, and adjust sleep time of each node dynamically though three differently mathematical models. By this way, the actual advantages of reducing the power consumption and increasing the total TTLs are presented in our simulation results.
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