Wednesday, 23 July 2014

Energy-Efficient Relaying via Store-Carry and Forward within the Cell



In this paper, store-carry and forward (SCF) decision policies for relaying within the cell are developed. The key motivation of SCF relaying stems from the fact that energy consumption levels can be dramatically reduced by capitalizing on the inherent mobility of nodes and the elasticity of Internet applications. More specifically, we show how the actual mobility of relay nodes can be incorporated as an additional resource in the system to achieve savings in the required communication energy levels. To this end, we provide a mathematical programming formulation on the aforementioned problem and find optimal routing and scheduling policies to achieve maximum energy savings. By investigating structural properties of the proposed mathematical program we show that optimal solutions can be computed efficiently in time. The tradeoffs between energy and delay in the system are meticulously studied and Pareto efficient curves are derived. Numerical investigations show that the achievable energy gains by judiciously storing and carrying information from mobile relays can grow well above 70 percent for the macrocell scenario when compared to a baseline multihop wireless relaying scheme that uses shortest path routes to the base station.

Fixed and/or mobile wireless nonregenerative or regenerative multihop relaying is currently considered as one of the most fundamental architectural elements to be integrated into the next generation of cellular networks. The rational of incorporating multihop relaying within the cell are multifaceted. The most well-documented ones relate to the ability of multihop relaying to enhance cell coverage, the spatial reuse of the scarce wireless resources and user throughput, especially at the cell edge, compared to traditional cellular architectures where mobile nodes transmit directly to the base station (BS). A further seminal aspect of multihop architectures, that has more recently attracted research attention, is their potential to reduce the overall energy consumption in the network. Multihop paths benefit from the superlinear relationship of the communication distance to the signal propagation losses. As such, there may exist a path from source to destination where the accumulated (re)transmission energy and the circuit energy consumption of all the participating transceivers en route, consist only a fraction of the required direct transmission energy consumption.

v Increased data rates over cellular networks and volume of data traffic that needs to be supported may lead to unsustainable requirements on energy consumption in wireless networks.
v It does not deliver the message correctly.

We present an architectural extension to current cellular network deployments that can potentially achieve many-fold reductions in the end-to-end communication energy consumption. The work is motivated by the need to realize substantial energy efficiency gains in the operation of cellular networks. This latter problem has been exacerbated recently by the growing adoption of mobile Internet over the subscriber base. Evidently, the introduction of data services on mobile phones has caused a considerable rise in the energy consumption of infrastructure systems. On the other hand, and unlike voice services with stringent quality of service requirements, Internet type services vary greatly in content, with very broad delivery delay constraints. Capitalizing on the elasticity of such delay tolerant services, mobile terminals can possibly postpone the transmission of information messages while in transit and only engage in communication at locations within the cell with favorable channel gains. Doing so, both the terminals and the BS require less power to communicate the information and thus conserve energy. Hence, in contrast to previous studies, we propose in this work mechanical relaying where mobile nodes store and carry information messages while in transit and only forward the data at a later time when they experience better channel conditions. Such a store-carry and forward (SCF) relying scheme can be utilized by a plethora of different elastic Internet applications such as for example email access, FTP and peer-to-peer file transfers, RSS feeds, status updates from social networking sites and over-theair software updates for the terminal.
v Store-carry and forwarding scheme is introduced for cellular networks.
v To An innovative network flow formulation is derived where the optimal routing and scheduling policies are constructed in small running times even for large network instances.



Processor             -       Pentium –IV

Speed                  -       1.1 Ghz
RAM                   -       512 MB(min)
Hard Disk            -       40 GB
Key Board           -       Standard Windows Keyboard
Mouse                 -       Two or Three Button Mouse
Monitor               -       LCD/LED
Operating system        :       Windows XP.
Coding Language       :       JAVA
Data Base                    :       SQL
Tool                            :       Netbeans

Panayiotis Kolios, Vasilis Friderikos, and Katerina Papadaki, “Energy-Efficient Relaying via Store-Carry and Forward within the Cell” IEEE TRANSACTIONS ON MOBILE COMPUTING, VOL. 13, NO. 1, JANUARY 2014.

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