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Network synchronization is a requirement for a time division duplex (TDD) femtocell network to prevent multi-access and inter-slot interference. Network Listening (NL) is a technique used for network synchronization where a base station (BS) is synchronized directly with another BS over-the-air, based on BS-BS measurements. Spanning tree based NL is the recommended technique for a local area indoor...
Active hand-in refers to the ability for a voice or data connection for a mobile on the macrocell to be seamlessly handed off to the target femtocell. The challenge for active hand-in is that a large number of femtocells share limited PN offsets in a geographical region and hence the target femtocell cannot be identified uniquely by its PN offset. An ideal solution would be one that requires no hardware...
In this paper, a) we investigate a simple throughput based incentive mechanism that could convince home users to install residential femtocells (by offering them a rate which is α > 1 times higher than the average rate received by a user associated with the macro base station), avoid most of the curse of free riders (i.e., selfish users who gets improved service just because others are investing...
In this paper, we present a comprehensive study of uplink interference management for 3G femtocell deployments. Focusing on co-channel deployment, where both femtocells and macrocells operate on the same carrier, femto-to-macro, macro-to-femto and inter-femto uplink interference scenarios are identified. To effectively control uplink interference in residential and enterprise femtocell deployments,...
Peer-to-Peer file sharing, computing and communication services are widely used by internet community and thoroughly studied by academia. However, main utilization of such services is in the wired networks due to several significant issues in the wireless world like connectivity, bandwidth, battery, unwillingness of cellular operators, etc. In the recent years, offering femtocell access points to...
The continuing trend of large scale emergencies in last decades have emphasized on ubiquitous public safety services. The growth of mobile handheld devices have provided people with wide scale flexibility of on demand services and enjoyment of ubiquity. In addition, currently people are not only service consumers but also information providers to realize ubiquitous public safety networks. During and...
The LTE specification provides QoS of multimedia services with fast connectivity, high mobility and security. However, 3GPP specifications have not defined scheduling algorithms to support real time and non-real time application services. In this paper we propose a two level scheduling scheme composed by cooperative game concept and EXP-RULE scheduling algorithm. By using cooperative game theory such...
This paper presents a non-convex optimization framework for the Network Utility Maximization problem in Wireless Networks, which incorporates the interference among links and introduces a power penalty term in the objective function to assure both convergence and energy efficiency of the method. Moreover, a distributed gradient based algorithm is proposed that converges to the optimal solution for...
The sleeping strategy has become popular to reduce power consumption of base stations (BSs) by shutting down underutilized BSs in the management of green cellular networks. In this paper, we propose a novel solution for an energy efficient use of cellular networks, based on traffic load balancing. By modeling the power consumption for BSs connected to uniformly distributed users, the relationship...
The energy efficiency of a wireless sensor depends of three criteria: the transmission power (transmission range), the radio links quality (BER) and finally the message length. In this paper, we propose to reduce the overall consumption of a sensor by adapting the transmission power according to the last two criteria. The originality of our approach is to improve an energy model by the use of a realistic...
Ad-hoc networks that support multi-hopping can provide a range of solutions for range-limited sensor and machine-to-machine networks. However such networks have their own set of implementation and performance issues. Clustering helps in organizing the networks and providing a backbone for routing data packets over multi-hop links. However multi-hopping itself can cause a loss in performance compared...
In this paper, we present a machine to machine (M2M) communication scheme, where the source communicates with the corresponding destination node with the help of one or more relay nodes. The objective is to minimize the total consumed power at the relays under specific performance constraints, while also considering the individual power limitations of each relay. In order to solve the original problem,...
Developing system software for ubiquitous computing makes consideration of numerous requirements necessary. This is primarily due to the dynamic, mobile, unpredictable and heterogeneous environment of ubiquitous computing systems. Middleware provide solutions to common tasks in ubiquitous computing, e.g. communication, discovery, deployment, personalisation, group management etc.
Resource allocation is an important prerequisite for the effective deployment of Pico Cells (PCs). This topic becomes even more challenging in the case of heterogeneous networks, where autonomous interference management mechanisms are necessary. In this article, we propose a resource sharing method inspired from the reinforcement learning theory and particularly the methods used to solve the Multi...
For co-channel deployment of Macrocell and indoor Femtocell, in order to mitigate downlink (DL) interference toward user equipments (UEs) of Macrocell, DL power control (PC) at Femto has been considered as the primary inter-cell interference cancelation (ICIC) strategy in 3GPP standardization. Further, currently, the 3GPP-agreed baseline for backhaul is that there is no direct X2/S1 interface between...
This work proposes an adaptive intercell interference avoidance scheme for the self-organization in Orthogonal Frequency Division Multiple Access (OFDMA) femtocell networks. Due to the expected large number of user-deployed cells, the femtocell networks suffers from the intercell interference problem. In this paper, we define the self-organizing resource allocation problem to maximize resource efficiency...
In this paper, we propose an autonomous radio resource allocation and optimization scheme that chooses the transmit power and precoding vector among codebooks for multiple antennas transmitters to improve spectral and power efficiency and provide user fairness. Network self-optimization is an essential feature for supporting the cell densification in future wireless cellular systems. The proposed...
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