9 research outputs found
Study on Energy Consumption and Coverage of Hierarchical Cooperation of Small Cell Base Stations in Heterogeneous Networks
The demand for communication services in the era of intelligent terminals is
unprecedented and huge. To meet such development, modern wireless
communications must provide higher quality services with higher energy
efficiency in terms of system capacity and quality of service (QoS), which
could be achieved by the high-speed data rate, the wider coverage and the
higher band utilization. In this paper, we propose a way to offload users from
a macro base station(MBS) with a hierarchical distribution of small cell base
stations(SBS). The connection probability is the key indicator of the
implementation of the unload operation. Furthermore, we measure the service
performance of the system by finding the conditional probability-coverage
probability with the certain SNR threshold as the condition, that is, the
probability of obtaining the minimum communication quality when the different
base stations are connected to the user. Then, user-centered total energy
consumption of the system is respectively obtained when the macro base
station(MBS) and the small cell base stations(SBS) serve each of the users. The
simulation results show that the hierarchical SBS cooperation in heterogeneous
networks can provide a higher system total coverage probability for the system
with a lower overall system energy consumption than MBS.Comment: 6 pages, 7 figures, accepted by ICACT201
End to End Performance Analysis of Relay Cooperative Communication Based on Parked Cars
Parking lots (PLs) are usually full with cars. If these cars are formed into
a self-organizing vehicular network, they can be new kind of road side units
(RSUs) in urban area to provide communication data forwarding between mobile
terminals nearby and a base station. However cars in PLs can leave at any time,
which is neglected in the existing studies. In this paper, we investigate relay
cooperative communication based on parked cars in PLs. Taking the impact of the
car's leaving behavior into consideration, we derive the expressions of outage
probability in a two-hop cooperative communication and its link capacity.
Finally, the numerical results show that the impact of a car's arriving time is
greater than the impact of the duration the car has parked on outage
probability.Comment: 7 pages, 7 figures, accepted by ICACT201
Green Cell-less Design for RF-Wireless Power Transfer Networks
This paper studies a new concept so-called green cell-less radio frequency
(RF) wireless power transfer (WPT) networks. We consider a scenario in which
multiple indoor access points (APs) equipped with outdoor energy harvesters are
connected with a central control unit via backhaul links. Further, such APs
exploit the harnessed green energy to recharge wirelessly indoor devices under
the coordination of the control unit. Considering the network, we focus on AP
selection and beamforming optimization to maximize the total energy harvesting
(EH) rate. The resulting mathematical problem has the form of mixed-integer
optimization that is intractable to solve. Thus, we propose an algorithm to
tackle this difficulty. Through numerical results, we show the advantages of
the cell-less design over the conventional small-cell one to validate our
ideas. In particular, the issue on safety requirements of human exposure to RF
radiation is discussed. Finally, potential future research is provided.Comment: 7 pages, 8 figures, accepted for publication in IEEE Wireless
Communications and Networking Conference, 15-18 April 2018, Barcelona, Spai