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This paper studies the scheduling of multiple real-time unicast videos (e.g. video calls) over the Orthogonal Frequency Division Multiple Access (OFDMA) air interface. Modified Largest Weighted Deadline First (M-LWDF) and Exponential Rule (EXP) were proposed to schedule traffic with quality-of-service constraints in shared-channel systems. Both have been proven to be throughput optimal and EXP also...
MapReduce offers a promising programming model for big data processing. Inspired by functional languages, MapReduce allows programmers to write functional-style code which gets automatically divided into multiple map and/or reduce tasks and scheduled over distributed data across multiple machines. Hadoop, an open source implementation of MapReduce, schedules map tasks in the vicinity of their inputs...
Dual-carrier High Speed Packet Access (DC-HSPA) system has been developed as an alternative method to double data rate using more bandwidth, without use of MIMO. Since it utilizes two carriers at a time, scheduling is more important feature than a single-carrier HSPA (SC-HSPA) system. From the nature of the DC-HSPA, both carriers can be allocated to one user when the user has the highest priority...
In wireless mobile environments, large bandwidth and high quality of service (QoS) are recently required to support the increased demand for multimedia services. Long term evolution (LTE) is one of the promising solutions for the next generation broadband wireless access systems. In order to support high data rate with low latency, LTE simplifies network architecture and uses orthogonal frequency...
Wireless networks operate in rapidly changing environments. Often parameters for particular algorithms are set with particular environments in mind, or assume certain conditions. When conditions change from interference, user mobility, handover and changing demand, the network may be unable to cope. To solve some of these problems we propose an online evolutionary approach to parameter computation...
In this paper, we focus on designing efficient query of top-k data produced by sensor nodes in a wireless sensor network (WSN). Assume that we are given a connected WSN of diameter D, consisting of n nodes with maximum node degree Δ. Two different models are studied. In the first model, each node holds a numeric element, the goal is to determine the top-k smallest (or biggest) of these elements from...
This paper presents new energy-aware QoS scheduling and call admission control algorithms for WiMAX IEEE 802.16e broadband wireless access standard. The scheduling algorithm works at MAC layer and is designed towards minimizing power consumption at mobile stations supporting multiple UGS connections, while meeting the QoS requirements of the connections. The scheduling algorithm uses a novel idea...
In this paper, we propose a scheduling algorithm for mobile WiMAX networks that distributes dynamically the bandwidth among service flows while giving real-time packets more chances to satisfy their QoS requirements. The scheduling in the proposed algorithm is assisted by the subscriber stations, hence requiring two-schedulers, a scheduler at the BS and another one at the SS, where preemption is applied...
This paper studies two online scheduling problems on parallel machines that process computing jobs arriving stochastically in a batch pattern. With the objective function as minimizing total completion time of weighted jobs or minimizing total latency of job completion, we propose two solutions for above scheduling problems, respectively. With the assumption that the processing time of a batch is...
To maximize the utilization of system resources with satisfying diverse quality of service (QoS) requirements, a novel multiple utility factors-based parallel (MUFP) packet scheduling algorithm is proposed for the broadcast base station (BBS) and cell base station (CBS) mixed mode of broadband wireless multimedia (BWM) systems. MUFP takes into consideration QoS requirements, queue dynamics and channel...
Using multipath routing protocols results in more efficient data transmission than single path routing protocols in Wireless Multimedia Sensor Networks (WMSNs). In this paper, we propose a new mechanism for improving video transmission over WMSN based on queue priority scheduling. We assume that network has high CBR traffic with no video data in addition to video packets. In our mechanism, intermediate...
Network coding can greatly improve the throughput and power efficiency of wireless networks by mixing packets from different flows into a single one before forwarding. However, packets need to wait for its correspondences before coding, which may induce additional delay and packet loss. Considering the diversity of traffic flows and the stochastic nature of the packet arrival process in wireless networks,...
In order to achieve higher bandwidth and higher throughput, the carrier aggregation (CA) technique has been adopted by the specifications of 3GPP Release 10 for Long Term Evolution (LTE) advanced systems, where the user equipment (UE) may operate over up to 5 component carriers (CCs). On the other hand, 3GPP specifications also define a mechanism named discontinuous reception (DRX) in order to save...
Given that statistical multiplexing of video streams is employed in enhanced Multimedia Broadcast/Multicast Service (e-MBMS), we address the issue of scheduling across the streams towards Advanced-Long Term Evolution (LTE-A) system, in order to improve the quality of service (QoS) performances. In this paper, the optimization problem of scheduling and resource allocation for separate streams is first...
The primary task of distributed virtual environments (DVEs) is to maintain a consistent view of the virtual world among all users. Multi-server architecture has been shown to have good scalability to support a large population of users in DVEs. However, some of the servers' resources like CPU, memory and network bandwidth can still get saturated as the scale of DVE increases. In this case, state updates...
This paper studies technologies for control and scheduling co-design. The influence of sampling period to networked control system is discussed. Based on control performance optimization and network scheduling condition, considering system control and network scheduling, an optimized model and optimal sampling period selection algorithm are proposed. Simulation results shows that the algorithm satisfies...
Using multipath routing protocols results in more efficient data transmission than single path routing protocols in Wireless Multimedia Sensor Networks (WMSNs). In this paper, we propose a new mechanism for improving video transmission over WMSN based on packet, path and queue priority scheduling over multipath routing protocol. We assume that network has high CBR (Constant Bit Rate) traffic with...
In this paper we are investigating the capacity of Mobile Ad Hoc Networks under a concurrent transmission constraint imposed by common MAC layer protocols (such as 802.11). This problem is known to be an NP-hard combinatorial problem and a greedy algorithm has been proposed for solving it in polynomial time. We propose an efficient algorithm for solving the exact problem and compare the exact and...
Considering knowledge workers team coordination in the knowledge-intensive enterprises and project task assignment, this paper quantifies the qualitative factor (team coordination) and divides the staff and task assignment costs into team uncoordinated cost, employment cost, employee switching cost and project delaying cost. And then a mixed integer programming model for the knowledge staff and task...
WiMAX is one of the most interesting solutions for broadband wireless access, offering QoS features for multimedia traffics and applications. However, without the definition of a mandatory scheduling algorithm for the assignment of channel resources, WiMAX standard is open to enhancements by QoS research groups and developers. In this paper, BS uplink scheduling algorithms are considered and an innovative...
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