Now showing items 1-20 of 242

  • An 802.11k Compliant Framework for Cooperative Handoff in Wireless Networks 

    Athanasiou, G.; Korakis, T.; Tassiulas, L. (2009)
    In IEEE 802.11-based wireless networks, the stations (STAs) are associated with the available access points (APs) and communicate through them. In traditional hando. schemes, the STAs get information about the active APs ...
  • Achieving proportional fairness using local information in Aloha networks 

    Kar, K.; Sarkar, S.; Tassiulas, L. (2004)
    We address the problem of attaining proportionally fair rates using Aloha protocols at the medium access layer. We consider a wireless network where all nodes need not be in transmission ranges of each other. We show how ...
  • Adaptive channel allocation in OFDM/SDMA wireless LANs with limited transceiver resources 

    Koutsopoulos, I.; Tassiulas, L. (2004)
    Smart antennas increase capacity of wireless systems by allowing channel reuse by several users in the same cell through space division multiple access (SDMA). Orthogonal Frequency Division Multiplexing (OFDM) creates ...
  • Adaptive channel assignment in SDMA-based wireless LANs with transceiver resource limitations 

    Koutsopoulos, I.; Tassiulas, L. (2006)
    Beamforming with adaptive antenna arrays is the most promising means for increasing data rates of wireless systems, since it enables channel reuse by several users in a cell through space division multiple access (SDMA). ...
  • Adaptive radio resource management in a sectored cell for broadband wireless access systems 

    Papathanasiou, C.; Dimitriou, N.; Tassiulas, L. (2010)
    In this work, we analyze the performance of a multi-user sectored MIMO/OFDMA system under the limited feedback constraint. Dynamic radio resource management methods are used to a reuse-one sectorized cell in order to reduce ...
  • Approximation Algorithms for Mobile Data Caching in Small Cell Networks 

    Poularakis, K.; Iosifidis, G.; Tassiulas, L. (2014)
    Small cells constitute a promising solution for managing the mobile data growth that has overwhelmed network operators. Local caching of popular content items at the small cell base stations (SBSs) has been proposed to ...
  • Approximation caching and routing algorithms for massive mobile data delivery 

    Poularakis, K.; Iosifidis, G.; Tassiulas, L. (2013)
    Small cells constitute a promising solution for managing the mobile data growth that has overwhelmed network operators. Local caching of popular content items at the small cell base stations has been proposed in order to ...
  • An architecture for secure VoiIP and collaboration applications 

    Zisiadis, D.; Kopsidas, S.; Tassiulas, L. (2007)
    VoIP and collaboration Internet applications are a driving force for the use and expansion of the Internet. Current applications usually require end user registration in a central user database, which in turn provides ...
  • Asymptotic laws for content replication and delivery in wireless networks 

    Gitzenis, S.; Paschos, G. S.; Tassiulas, L. (2012)
    A key consideration in novel communication paradigms in multihop wireless networks regards the scalability of the network. We investigate the case of nodes making random requests on content stored in multiple replicas over ...
  • Asymptotic Laws for Joint Content Replication and Delivery in Wireless Networks 

    Gitzenis, S.; Paschos, G. S.; Tassiulas, L. (2013)
    We investigate the scalability of multihop wireless communications, a major concern in networking, for the case that users access content replicated across the nodes. In contrast to the standard paradigm of randomly selected ...
  • Asymptotically optimal policies for wireless networks with rechargeable batteries 

    Gatzianas, M.; Georgiadis, L.; Tassiulas, L. (2008)
    We consider the problem of cross-layer resource allocation for single-hop, time-varying, wireless networks operating with rechargeable batteries under general arrival, channel and recharge processes. The objective is to ...
  • Asynchronous TDMA ad hoc networks: scheduling and performance 

    Salonidis, T.; Tassiulas, L. (2004)
    A common assumption of time division multiple access (TDMA)-based wireless ad hoc networks is the existence of network-wide slot synchronization. Such a mechanism is difficult to support in practice. In asynchronous TDMA ...
  • Auction-based scheduling of wireless testbed resources 

    Niavis, H.; Choumas, K.; Iosifidis, G.; Korakis, T.; Tassiulas, L. (2014)
    Experimentation in testbeds is gaining increasing ground as a necessary validation step for every theoretical study in communication networks. However, the first-come-first-served policy employed today by most testbeds ...
  • Autonomic cache management in Information-Centric Networks 

    Sourlas, V.; Flegkas, P.; Gkatzikis, L.; Tassiulas, L. (2012)
    Recent research efforts in the area of future networks indicate Information-Centric Networking (ICN) as the dominant architecture for the Future Internet. The main promise of ICN is that of shifting the communication ...
  • Back pressure based multicast scheduling for fair bandwidth allocation 

    Sarkar, S.; Tassiulas, L. (2005)
    We study the fair allocation of bandwidth in multicast networks with multirate capabilities. In multirate transmission, each source encodes its signal in layers. The lowest layer contains the most important information and ...
  • Bargaining-based mobile data offloading 

    Gao, L.; Iosifidis, G.; Huang, J.; Tassiulas, L.; Li, D. (2014)
    The unprecedented growth of mobile data traffic challenges the performance and economic viability of today's cellular networks and calls for novel network architectures and communication solutions. Data offloading through ...
  • Broadcast erasure channel with feedback-capacity and algorithms 

    Georgiadis, L.; Tassiulas, L. (2009)
    We consider the two-user broadcast erasure channel where feedback in the form of ack messages is fed back to the transmitter. We provide an upper bound to the capacity region of this system. We then present two algorithms ...
  • C2M: Mobile data offloading to mesh networks 

    Apostolaras, A.; Iosifidis, G.; Chounos, K.; Korakis, T.; Tassiulas, L. (2014)
    As the unprecedented growth of mobile data traffic places significant strain on cellular networks, alternative plans for exploiting already existing and under-utilized wireless infrastructure, become quite attractive. In ...
  • Cache-aware routing in Information-Centric Networks 

    Sourlas, V.; Flegkas, P.; Tassiulas, L. (2013)
    Information-Centric Networking (ICN) has attracted the attention of the research community, which has argued that content, instead of end-points, must be at the center stage of attention. The research issues addressed by ...
  • Caching in content-based publish/subscribe systems 

    Sourlas, V.; Paschos, G. S.; Flegkas, P.; Tassiulas, L. (2009)
    In a publish/subscribe network, message delivery is guaranteed for all active subscribers at publish time. However, in a dynamic scenario where users join and leave the network, a user may be interested in content published ...