Combinatorial optimization: algorithms and complexity
Combinatorial optimization: algorithms and complexity
Fair end-to-end window-based congestion control
IEEE/ACM Transactions on Networking (TON)
A distributed load balancing algorithm for the hot cell problem in cellular mobile networks
HPDC '97 Proceedings of the 6th IEEE International Symposium on High Performance Distributed Computing
Wireless downlink data channels: user performance and cell dimensioning
Proceedings of the 9th annual international conference on Mobile computing and networking
Proceedings of the 10th annual international conference on Mobile computing and networking
Convergence of proportional-fair sharing algorithms under general conditions
IEEE Transactions on Wireless Communications
Opportunistic beamforming using dumb antennas
IEEE Transactions on Information Theory
CDMA/HDR: a bandwidth efficient high speed wireless data service for nomadic users
IEEE Communications Magazine
Providing quality of service over a shared wireless link
IEEE Communications Magazine
Distributed call admission control in mobile/wireless networks
IEEE Journal on Selected Areas in Communications
Opportunistic transmission scheduling with resource-sharing constraints in wireless networks
IEEE Journal on Selected Areas in Communications
Fundamental design issues for the future Internet
IEEE Journal on Selected Areas in Communications
IEEE Journal on Selected Areas in Communications
Efficient cell selection algorithm in hierarchical cellular networks: multi-user coordination
IEEE Communications Letters
Customer oriented resource allocation framework in cognitive radio
Computers and Industrial Engineering
Journal of Network and Systems Management
Unlocking wireless performance with co-operation in co-located base station pools
COMSNETS'10 Proceedings of the 2nd international conference on COMmunication systems and NETworks
Journal of Network and Systems Management
Adaptive spatial intercell interference cancellation in multicell wireless networks
IEEE Journal on Selected Areas in Communications - Special issue on cooperative communications in MIMO cellular networks
Joint Load Balancing of Radio and Transport Networks in the LTE Systems
Wireless Personal Communications: An International Journal
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We investigate a wireless system of multiple cells, each having a downlink shared channel in support of high-speed packet data services. In practice, such a system consists of hierarchically organized entities including a central server, Base Stations (BSs), and Mobile Stations (MSs). Our goal is to improve global resource utilization and reduce regional congestion given asymmetric arrivals and departures of mobile users, a goal requiring load balancing among multiple cells. For this purpose, we propose a scalable cross-layer framework to coordinate packet-level scheduling, call-level cell-site selection and handoff, and system-level cell coverage based on load, throughput, and channel measurements. In this framework, an opportunistic scheduling algorithm--the weighted Alpha-Rule--exploits the gain of multiuser diversity in each cell independently, trading aggregate (mean) down-link throughput for fairness and minimum rate guarantees among MSs. Each MS adapts to its channel dynamics and the load fluctuations in neighboring cells, in accordance with MSs' mobility or their arrival and departure, by initiating load-aware handoff and cell-site selection. The central server adjusts schedulers of all cells to coordinate their coverage by prompting cell breathing or distributed MS handoffs. Across the whole system, BSs and MSs constantly monitor their load, throughput, or channel quality in order to facilitate the overall system coordination. Our specific contributions in such a framework are highlighted by the minimum-rate guaranteed weighted Alpha-Rule scheduling, the load-aware MS handoff/cell-site selection, and the Media Access Control (MAC)-layer cell breathing. Our evaluations show that the proposed framework can improve global resource utilization and load balancing, resulting in a smaller blocking rate of MS arrivals without extra resources while the aggregate throughput remains roughly the same or improved at the hot-spots. Our simulation tests also show that the coordinated system is robust to dynamic load fluctuations and is scalable to both the system dimension and the size of MS population.