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We consider a 5G small cell model where the cells are deployed in a way to cover users in the neighbor cells in order to introduce cell active-sleep control, so-called inter-cell power management (IPM). Using a Markov decision process (MDP), one can obtain an optimal policy for IPM, but with limited scalability. This paper proposes a modular IPM strategy which is a suboptimal policy to group only...
In the cooperative wireless networks, the source node transmits its packets to the destination in one hop with the cooperation from the helper nodes. We design a TDMA-based cooperative MAC which can determine the cooperative cooperation opportunity, to maximize the expected reward, taking into consideration the gain of cooperative communication and network coding that are received from all of its...
Wireless link is not reliable and has a time-varying quality. When a link quality is bad, all transmissions over the link are not successful and persistent retransmissions of the failed packet over the same link are not productive. Consider the broadcast nature of radio communications, a packet that fails to reach its intended receiver may be successfully received by neighbors. The idea of cooperative...
We envisage extending radio coverage of the existing terrestrial wireless broadband networks to the sea to provide ships with cost-efficient high-speed connection to the Internet. This is achieved by forming a WiMAX based maritime wireless mesh network where ships are network nodes connected to the land station across multiple hops. In such a maritime wireless mesh network, time slot allocation is...
Existing communications from ships via satellites are expensive. We are motivated to extend the cheaper terrestrial communication coverage to sea via multi-hop networking. Maritime environment presents new challenges because sea surface moves randomly resulting in wave occlusion that breaks communication links. This paper models the maritime communication link after considering the wave occlusion...
The inherent near-far effect in wireless networks causes nodes that are further away from the receiver to suffer from throughput degradation, as packets from nodes that are nearer are typically received with greater signal strengths. This unfair situation is traditionally overcome by power control. However, when power control is not feasible, for example in tiny sensor nodes with power-limited batteries,...
We design a cooperative retransmission scheme in the MAC layer which utilizes the UWB unique properties such as fine ranging and immunity to small scale fading in order to exploit the multiuser diversity in UWB networks. We analyze the optimal cooperation strategy to maximize the system throughput in proactive and reactive settings. We also perform simulations to show that the proposed UWB-based coperative...
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