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A large-scale deployment of femto BSs (FBSs) will result in the substantial energy consumption. One fairly intuitive way to improve energy efficiency for femtocells is a sleep mode where the FBS periodically transmits pilot signal especially in low traffic scenario. Nevertheless, it is inefficient when not involved an active call in the FBS coverage area. To address this issue, this paper proposes...
We exploit helper-to-helper (h-2-h) cooperation using the broadcast nature of wireless sensor networks. The potential helpers overhear the packet from the transmission of previous hop and the helper transmits the packet in the current hop on behalf of the assigned node (sender). We call it friendship relaying cooperative medium access control (FRC-MAC) protocol. This mechanism eliminates the sender...
In this paper the problem of delay tolerant message data transmission scheduling over Cognitive Radio (CR) enabled wireless networks is considered with special emphasis on high mobility users (vehicles). The proliferation of delay tolerant applications (social networking updates, emails, updates over the air to mention just a few) can drive efficient utilization of available spectrum by Secondary...
This paper studies the energy efficiency (bits/joule) in relay assisted networks using Chase combining hybrid-ARQ (HARQ-CC) retransmission technique. As energy efficiency depends on the average delay and the packet error probability (PER), we start by deriving an approximation of the PER for HARQ-CC retransmission scheme. This approximation is really simple compared to the existing expressions in...
The aim of this paper is to improve the energy efficiency during network discovery in heterogeneous networking environments. To this end, we propose a novel network discovery algorithm that exploits both user and network context information in order to efficiently adapt the network scanning period, thus avoiding unnecessary energy-consuming scanning or mis-detection of available networks that can...
In this paper we exploit the characteristics of Physical layer Network Coding (PNC) in multicast short range networks. We present a scalable scenario of partially overlapping short range networks, where collisions are resolved through indirect inter-group cooperation based on the features of PNC. Our scenario consists of a central network, which is our network of interest, and several surrounding...
There are some classical routing protocols for WSNs (Wireless Sensor Networks) such as LEACH [3] and PEGASIS [5]. However, these protocols may have some problems in delay or energy consumption. In this paper, a novel routing protocol called DCEE (Delay-Constrained and Energy-Efficient) multi-hop routing protocol is proposed, which has high performance in delay and energy cost. In DCEE, through the...
Vast majority of the services running on the smart phone today are networked in that significant amount of communication is required. Smart phone energy expenditure due to Wi-Fi communications constitutes significant portion of the battery discharge. In this paper, we first investigate the key factors influencing Wi-Fi energy consumption, and propose three energy management schemes: 1) Dynamic control...
In many sensor network applications the major traffic pattern consists of data collected from many source nodes to a sink through a tree. In this paper, we propose S-Non Bcn based on nonbeacon-enabled (Non Bcn) mode of IEEE 802.15.4, an energy-efficient and low-collision MAC that is designed and optimized for such data gathering trees in wireless sensor networks. S-Non Bcn uses staggered sleep mechanism...
The paper proposes a multi-hop Reed-Solomon (RS) encoding scheme for image transmission on wireless sensor networks. In this scheme, an encoding task is divided into several small processing components, which are then distributed to multiple nodes along a path from a source node to a cluster head within a cluster. We perform extensive computational simulations to validate our method using RS codes...
This paper presents a cached DIMM architecture â" a low-latency and energy-efficient memory system. Two techniques are proposed: the on-DIMM cache and the on-DIMM cache-aware address mapping scheme. These two techniques work together to reduce the memory access latency. Based on the benchmarks considered, our experiments show that compared to a conventional DRAM main memory, the proposed...
Sensors are capable of supporting multiple applications concurrently. Recent works reveal several possibilities of running multiple applications in a wireless sensor network. In this work, we introduce the compression factor to quantify the change of the message length due to the aggregations of application messages. Delay constraints are introduced for two communication paradigms in wireless sensor...
Energy consumption in mobile networks, e.g. 3G networks, may be a substantial part of an operator's expenses. A large part of the total energy of the network is consumed by the radio access network. Today operators are saving energy by turning off carriers or cells during periods with low traffic by manually configuring on-off periods. At the same time, operators are seeking to increase cost efficiency...
Nowadays, due to wide applicability of Wireless Sensor Network (WSN) added by the low cost sensor devices, its popularity among the researchers and industrialists are very much visible. A substantial amount of works can be seen in the literature on WSN which are mainly focused on application specific WSN considering its resource constraints, neglecting the return-of-investment and usefulness of the...
Based on IEEE 802.15.4, a contention-free period (CFP) adopts guarantee time slot (GTS) mechanism to ensure each device can access the radio channel. However, it is hard to get the authority to access the radio channel due to more competitors access the radio channel simultaneously. To cope with this issue, we proposed a guarantee time slot mechanism to enhance the performance and utilization of using...
Optical networks have been pointed out as strong candidates to ensure energy-efficiency in the Internet backbone, as well as the distributed applications such as computational grids. In this paper, we propose a distributed framework to address energy-efficient lightpath establishment problem for computational grids over the optical WDM backbone. Each backbone node maintains two thresholds to determine...
We investigated the use of caching of packets containing video at intermediary routers to reduce the delay and energy consumption of Automatic Repeat reQuest (ARQ) error recovery. We modeled the two mathematical programs that select the optimal set of routers to have caching ability, one to minimize energy consumption and the other to minimize retransmission delay. Both of these mathematical programs...
In this paper, we investigated the problem of finding an efficient topology for delay-constrained data in WSNs. As we know topology control is one of the important mechanisms designed for decreasing energy consumption in WSNs. Since topology control may increase the end-to-end delay, one of the criteria's should be considered in topology control algorithms is delay constraint. Most existing works...
The delay sensitive industrial control applications like Industrial process control, Environmental control, Gas leakage monitoring, etc. in this a reliable communication between sensor and base station are highly essential. Wireless Sensor Networks (WSN) becomes an immensely popular technology in such application as it offers low latency and high energy-efficiency in message transmission. Life span...
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