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# IET Communications

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Displaying Results 1 - 19 of 19
• ### Editorial - Green technologies for wireless communications and mobile computing

Publication Year: 2011, Page(s):2595 - 2597
Cited by:  Papers (1)
| | PDF (109 KB)

Green technology has been one of the most important issues in developing networking techniques and communication systems. Energy-efficient techniques used in networking and computing have recently received considerable attention. Green technologies foster environmental sustainability and the economics of energy efficiency. Reducing the energy consumption of computing and communication infrastructu... View full abstract»

• ### Dual access points association in relay networks to conserve mobile terminals' energy

Publication Year: 2011, Page(s):2598 - 2605
Cited by:  Papers (3)
| | PDF (825 KB)

In this study, the authors consider the benefits of mobile terminals (MTs) with different access points (APs) for uplink and downlink transmission to conserve MTs' energy. In traditional cellular networks, an MT is typically associated with a single AP. However, as wireless networks evolve, heterogeneous and/or overlay deployment scenario become viable and an MT can be associated with different AP... View full abstract»

• ### Sleep mode design for green base stations

Publication Year: 2011, Page(s):2606 - 2616
Cited by:  Papers (21)
| | PDF (641 KB)

In this study, the potential of reducing radio base station operational energy consumption is discussed in terms of deploying sleep modes. By periodically switching off the base station transmission, or using fewer transmit antennas, the energy consumption of base station hardware decreases. By delivering less control signalling overhead, the radio frequency energy consumption can also be reduced.... View full abstract»

• ### Energy and cost impacts of relay and femtocell deployments in long-term-evolution advanced

Publication Year: 2011, Page(s):2617 - 2628
Cited by:  Papers (27)
| | PDF (494 KB)

In long-term-evolution-advanced (LTE-advanced), heterogeneous deployments of relays, femtocells and conventional macrocells are expected to provide coverage extension and throughput enhancement, while significantly lowering the energy consumption and total-cost-of-ownership (TCO) in cellular networks. This study presents a methodology for estimating the total energy consumption, taking into accoun... View full abstract»

Publication Year: 2011, Page(s):2629 - 2639
Cited by:  Papers (7)
| | PDF (865 KB)

Mobile communication industries are increasingly contributing to the worldwide energy consumption and CO2 emission. This study addresses a number of key radio resource management (RRM) strategies across PHY and MAC layers for reducing base station energy consumption, as measured by a Joules per bit metric. These strategies including power efficient link adaptation, exploitation of mul... View full abstract»

• ### Energy-efficient user grouping algorithms for power minimisation in multi-carrier code division multiple access systems

Publication Year: 2011, Page(s):2640 - 2647
Cited by:  Papers (3)
| | PDF (605 KB)

Energy efficiency has become increasingly important in wireless communications nowadays. Saving energy will not only reduce operating cost but also reduces greenhouse gas emissions, which is important for combating climate change. The authors propose energy-efficient user grouping algorithms to provide power minimisation of grouped multi-carrier code division multiple access (MC-CDMA) and space-ti... View full abstract»

• ### Adaptive online power control scheme based on the evolutionary game theory

Publication Year: 2011, Page(s):2648 - 2655
Cited by:  Papers (1)
| | PDF (352 KB)

In view of the remarkable growth in the number of users and the limited network resource, an efficient network management is very important and has been an active area of research over the years. Especially, during wireless network operations, adaptive power control is an effective way to enhance the network performance. In this study, a new online power control scheme is proposed based on the evo... View full abstract»

• ### Cost-efficient network mobility scheme over proxy mobile IPv6 network

Publication Year: 2011, Page(s):2656 - 2661
Cited by:  Papers (7)
| | PDF (557 KB)

As Wi-Fi handheld devices providing a variety of data and multimedia services become more widespread, and as the global demand for internet access everywhere rapidly increases, energy-efficient network mobility (NEMO) technology is attracting great attention with respect to the latest research in mobile networking. The previous research relating to energy-efficient networks in mobile networking ha... View full abstract»

• ### Adaptive time division multiple access-based medium access control protocol for energy conserving and data transmission in wireless sensor networks

Publication Year: 2011, Page(s):2662 - 2672
Cited by:  Papers (5)
| | PDF (607 KB)

Traditional time division multiple access (TDMA)-based medium access control (MAC) protocols for wireless sensor networks (WSNs), for example, low-energy adaptive clustering hierarchy (LEACH), allocate one time slot for each node within a cluster. For nodes that have no data to send, the radio module is still active. Such approaches drain the precious battery energy. In this study, the authors pro... View full abstract»

• ### Compressed data-stream protocol: an energy-efficient compressed data-stream protocol for wireless sensor networks

Publication Year: 2011, Page(s):2673 - 2683
Cited by:  Papers (1)
| | PDF (586 KB)

In this study, the authors present an energy-efficient data compression protocol for data collection in wireless sensor networks (WSNs). WSNs are essentially constrained by motes' limited battery power and networks bandwidth. The authors focus on data compression algorithms and protocol development to effectively support data compression for data gathering in WSNs. Their design of compressed data-... View full abstract»

• ### Power-aware data dissemination protocol for grid-based wireless sensor networks with mobile sinks

Publication Year: 2011, Page(s):2684 - 2691
Cited by:  Papers (3)
| | PDF (640 KB)

In wireless sensor networks (WSNs), sink mobility has been drawing more and more attention in recent years. Some approaches suggest that mobile sinks repeatedly propagate packets to notify the potential sources of their latest location information. As a result, frequent location updates from multiple sinks introduce both increased transmission traffic and rapid power expenditure. In order to reduc... View full abstract»

• ### Energy-aware interference-sensitive geographic routing in wireless sensor networks

Publication Year: 2011, Page(s):2692 - 2702
Cited by:  Papers (3)
| | PDF (671 KB)

Energy conservation and interference reduction are the two ultimate goals in the design of network protocols for wireless sensor networks (WSNs). Energy-aware geographic routing has been considered as an attractive routing scheme for energy conservation in WSNs owing to its desirable scalability and simplicity. However, most energy-aware geographic routing protocols seldom consider interference re... View full abstract»

• ### Data aggregation model using energy-efficient delay scheduling in multi-hop hierarchical wireless sensor networks

Publication Year: 2011, Page(s):2703 - 2711
Cited by:  Papers (1)
| | PDF (616 KB)

This study addresses a data aggregation model in hierarchical sensor networks, which provides centralised and distributed clustering mechanisms with evenly distributed heads. The model includes intra-cluster and inter-cluster network operations, whereas nodes report data and residual energy to a sink. Additionally, an energy merging scheme reduces node's storage and communication overheads during ... View full abstract»

• ### Capacity of hybrid cognitive network with outage constraints

Publication Year: 2011, Page(s):2712 - 2720
Cited by:  Papers (2)
| | PDF (427 KB)

The concept of cognitive radio is to exploit efficiently the spectrum resources by allowing the coexistence of the primary and secondary users in the same bandwidth without interfering the performance of primary users. Three coexisting models (overlay, underlay and interleave) were presented in recent literature. In this study, the authors propose a hybrid cognitive network model with overlay and ... View full abstract»

• ### IEEE 802.21 Information services deployment for heterogeneous mobile environments

Publication Year: 2011, Page(s):2721 - 2729
Cited by:  Papers (4)
| | PDF (630 KB)

In the future mobile Internet, a key challenge is how the content is delivered to the mobile user, especially when there are multiple networks belonging to distinct operators. Knowing the network services and conditions available at each one becomes crucial. In order to store information from several networks and operators, the new IEEE 802.21 standard specifies a Media Independent Information Ser... View full abstract»

• ### Outage probability of cognitive radio networks with relay selection

Publication Year: 2011, Page(s):2730 - 2735
Cited by:  Papers (3)
| | PDF (190 KB)

In this study, the author investigates the outage performance of cognitive relay networks, in which the best relay is selected based on full and partial channel state information, respectively. The author derives exact closed-form expressions for both relay selection schemes, and study their asymptotic performance in terms of the diversity order based on the performance bound analysis. Simulation ... View full abstract»

• ### Heavy-tail and voice over internet protocol traffic: queueing analysis for performance evaluation

Publication Year: 2011, Page(s):2736 - 2743
| | PDF (707 KB)

Study the effects of concurrent voice connections on the performance metrics of communication network such as queue length, waiting time, packets service time and is very important. Mathematical analysis of such network especially with long-tail traffic will help us for a good capacity planning and also lead to an accurate admission control algorithms. In this study a mathematical model of a commu... View full abstract»

• ### Theoretical characterisation of memory polynomial systems with in-phase-quadrature imbalanced Gaussian inputs: application to orthogonal frequency division multiplexing error rate analysis

Publication Year: 2011, Page(s):2744 - 2750
| | PDF (325 KB)

This study addresses the problem of theoretical characterisation of memory polynomial systems driven by complex-valued Gaussian signals with real and imaginary components imbalanced with respect to those of the original information signal. In various practical applications, both effects are observed jointly. The authors prove a theorem about a representation of the distorted signal in the form of ... View full abstract»

Publication Year: 2011, Page(s):2751 - 2759
Cited by:  Papers (5)
| | PDF (669 KB)

The great potential of free space optics (FSO) communication motivates to use it for future requirement of high bandwidth links. However, the widespread use of this technology has been hampered by the reduced availability because of weather effects. To overcome these shortcomings a back-up link can be used so that the combined hybrid network may achieve carrier class availability. A hybrid, FSO/wi... View full abstract»

## Aims & Scope

IET Communications covers the theory and practice of systems, networks and applications involving line, mobile radio, satellite and optical technologies for telecommunications, and Internet and multimedia communications.

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