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Minority game-based interference management (MGIM) for spectrum sharing is implemented and its experimental results are reported. MGIM is a decentralized transmission scheduling for a lower-priority system to prevent severe interference at a higher-priority system only using one-bit feedback information from the higher-priority system. By using MGIM, it has been demonstrated that the transmitters...
We consider the problem of optimizing time averages in systems with independent and identically distributed behavior over renewal frames. This includes scheduling and task processing to maximize utility in stochastic networks with variable length scheduling modes. Every frame, a new policy is implemented that affects the frame size and that creates a vector of attributes. An algorithm is developed...
A critical aspect of applications with wireless sensor networks is network lifetime. Sensing and communications consume energy particularly in wireless multimedia sensor networks (WMSN) due to huge amount of data generated by the multimedia sensors. Therefore, judicious power management and sensor scheduling can effectively extend network lifetime. In this paper we consider the problem of scheduling...
In the increasingly popular Voice over IP (VoIP) application domain, a well known issue relates to the management of available network bandwidth which is usually constrained by uplink capacities as well as access point limitations in the case of wireless connections. An approach that has long been advocated for controlling the admission of new connections based on bandwidth availability is Call Admission...
After relaying technology is introduced into the cellular system, many research fields emerge. Among them, resource allocation strategy for distributed and centralized scheduling is an important topic. This paper analyzes and compares the differences between these two scheduling modes, including both system performance and signaling overhead. Two practical scheduling strategies and an efficient routing...
This demo aims at (i) validating the design choices we have made in conceiving and deploying the WING testbed, and (ii) showing the capability of out software toolkit to properly support heterogeneous multimedia applications. Additionally, the mesh networking toolkit's fault management features is demonstrated. We hope that our wireless mesh networking toolkit is considered by both researchers and...
The interaction between wireless optimized scheduling algorithms and TCP congestion control mechanisms can have adverse effects on the performance of the system. We focus on the queue based max-weight (QBMW) scheduler, a scheduling strategy which is known to be throughput-optimal under unregulated traffic sources. We use fluid modeling to describe the time evolution of the congestion window size and...
Frequency-time scheduling is an essential radio resource management (RRM) function in Orthogonal Frequency Division Multiple Access (OFDMA) wireless systems. In the literature, there are several OFDMA scheduling algorithms such as the Hungarian and Max-Max algorithm. However, such algorithms do not consider the multiuser diversity into account. In this paper, we propose a scheduling algorithm that...
Wireless interference is a key issue affecting network performance. In this paper, we address the broadcast scheduling problem in wireless multi-hop networks with interference. We propose a policy called EMDF (evolved minimum degree first) which assigns different transmission slots for nodes within a three-hop neighborhood to effectively decrease the conflicts caused by both hidden terminal problem...
In this paper, we consider the multicast channel in a cellular network wherein all the users within a cell request a common information stream from the base station. In addition to data streaming this can also model control channels in the cell as opposed to the regular data channels used for user specific information transmission. While the multicast transmission in a single cell environment has...
We consider a class of wireless networks with general interference constraints and heterogeneous transmission rates under single-hop traffic. The delay analysis of throughput optimal (queue length based) scheduling policies in such systems is extremely difficult due to complex correlations arising between the arrival, service and the queue length process. We use the underlying interference constraints...
Providing strong QoS guarantees for wireless multi-hop networks is very challenging, due to many factors such as use of a shared communication medium, variability in wireless link quality, and so on. However, wireless mesh technology gives the opportunity to alleviate some of these problems, due to lack of mobility in the wireless infrastructure, and presence of natural centralization points in the...
In order to establish and maintain a quality of service (QoS) framework in wireless network, a major requirement is to prolong network lifetime, with simultaneous preservation of other major requirements like coverage, connectivity and adequate resources. In this work an approach is proposed which on a periodic basis it schedules the interfaces into active and inactive phases by using a layered state...
This paper studies and develops efficient traffic management techniques at the base station of future multi-service IP-based network. The proposed scheduler does not only consider the delay requirements of each traffic class in a static manner, but also the instant delay margin of each packet. This is due to the fact that the instant delay margin is significantly more meaningful than the delay requirement...
Two ways to substantially enhance wireless broadband capacity are full frequency reuse and smaller cells, both of which result in operational regimes that are highly dynamic and interference limited. This paper presents a system-level approach to interference management, that has reasonable backhaul communication and computation requirements. The basis for the approach is clustering and aggregation...
The introduction of advanced radio resource management features such as directional antennas, power control and variable data rates have been proposed to increase the performance of multihop wireless networks. In this paper we will study the combined effects of adaptive rate selection and power control in spatial time division multiple access (STDMA) networks where nodes are equipped with advanced...
Recently many researches have been focused on heterogeneous cooperative wireless networks in both academy and industry. This paper gives a comprehensive study of resource scheduling techniques for next generation heterogeneous cooperative wireless networks. Specifically, we study the cooperative nodes selection, cooperative power allocation, cooperative scheduling algorithms and handover management...
Advances in MEMS, microprocessor, and wireless technologies, have accelerated deployment of network-capable computing devices attached to various objects over the world. These devices should be small in size and have a characteristic of extremely low power consumption. Therefore, in 2004, IEEE802.15.4 has been established as a global standard satisfying low power and low cost. After that, the phenomenal...
The following topics are dealt with: IP network security; wireless security; network topology; power line communication; intelligent transportation; cryptography; P2P streaming; wireless communication; wireless channel; network traffic; routing protocol; security protocols; resource management; ad hoc network; wireless sensor network; MAC protocol; power control; QoS; scheduling; coding; modulation;...
The next generation of wireless networks (4G) will use OFDMA (Orthogonal Frequency Division Multiple Access) in the reverse link. In OFDMA, the reverse link resources assigned to a user are called tiles each of which consists of a subset of consecutive subcarriers. Since at most one user is assigned to each of these tiles then reverse link transmissions within a sector are orthogonal. However, the...
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