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To reduce datacenter energy consumption and cost, current practice has considered demand-proportional resource provisioning schemes, where servers are turned on/off according to the load of requests. Most existing work considers instantaneous (Internet) requests only, which are explicitly or implicitly assumed to be delay-sensitive. On the other hand, in datacenters, there exist a vast amount of delay-tolerant...
We consider packet erasure correction coding for a streaming system where specific information needs to be decoded by specific deadlines, in order to ensure uninterrupted playback at the receiver. In our previous work [1], we gave a capacity-achieving code construction for the case of a fixed number of erasures. In this work, we consider a sliding window erasure pattern where the number of erasures...
This paper introduces a distributed mechanism for wireless channel allocation in smart grids. In wireless communication system for smart grid, we have to consider two factors: the unavoidable external interference and the numerous terminals in the network. By defining a priority for each wireless device, the wireless channels are allocated for each terminal interrupted by accident in a distributed...
Two key components contribute to task completion time: execution cost and communication cost. The communication cost is induced by data transfers from one task to another residing on separate nodes. To reduce communication cost, interdependent tasks are allocated to closely located nodes. However, once tasks are allocated, nodes can move within a Grid. The node mobility within a Grid can increase...
This paper proposes an improved scheduling algorithm that optimizes the allocation of the real-time services and elastic flows in EPON by spreading the real-time service periods lowering the delay and thus fulfilling the QoS requirements.
Low power has become a burning issue in modern VLSI design. To deal with this problem, the multiple-supply voltage (MSV) is a technique widely applied to a design to reduce its power consumption. However, there exist several challenges in implementing Multi-Voltage designs, which includes floorplanning, level-shifter placement, and power planning [5]. Among these challenges, placement of level shifters...
The WSNs (Wireless Sensor Networks) is a network technique for the implementation of Ubiquitous computing environment. The GTS (Guaranteed Time Slot) of the IEEE 802.15.4 standard, which is the contention free access mechanism, is used for low latency applications or applications requiring specific data bandwidth. The current standard GTS allocation scheme uses FIFS (First In First Service) scheduling...
The IEEE 802.16 standard is one of the most promising broadband wireless access systems. The standard incorporates a QoS architecture that supports both realtime and non-realtime applications. To provide QoS three data schedulers are furnished by the architecture. However, the working of the schedulers are not defined by the standard. Some researchers have attempted to fill this gap by providing different...
This work presents a static instruction allocation scheme for the precision timed architecture's (PRET) scratchpad memory. Since PRET provides timing instructions to control the temporal execution of programs, the objective of the allocation scheme is to ensure that the explicitly specified temporal requirements are met. Furthermore, this allocation incorporates instructions from multiple hardware...
Infrastructure-as-a-service cloud provides a suitable environment where cloud users can run data-intensive applications and store their required data files. The performance of data-intensive applications strongly depends on data transmission delay. This delay is a function of the size of data files, the location of virtual machines that run the applications as well as the allocation of data rates...
Dynamic Partial Reconfiguration (DPR) on FPGAs has attracted significant research interests in recent years since it provides benefits such as reduced area and flexible functionality. However, due to the lack of supporting synthesis tools in current DPR design flow, leveraging these benefits requires specific designer expertise with laborious manual design effort. Considering the complicated concurrency...
End-hosts are increasingly equipped with multiple network interfaces, ranging from smartphones with multiple radios to servers with multi-homing. These interfaces are diverse; some are expensive to use (e.g. 4G), some are free (e.g WiFi) and they have different rates and reliability. On the other hand, end-hosts now run diverse applications with different priorities, from relatively less important...
Cooperative schemes for critical content distribution over vehicular networks are presented and analyzed. The first scheme is based on unicasting from the base station, whereas the second is based on threshold based multicasting. Long Term Evolution (LTE) is used for long range communications with the base station (BS) and 802.11p is considered for inter-vehicle collaboration on the short range. A...
This paper introduces the first exact method for optimal resource sharing in a pipelined system in order to minimize area. Given as input a dependence graph and a throughput requirement, our approach searches through the space of legal resource allocations, performing both scheduling and optimal buffer insertion, in order to produce the minimum area implementation. Furthermore, we do not arbitrarily...
On the progress of researching for key technology and standard of LTE-Advanced, enhanced mobility control and Carrier Aggregation (CA) are kept to be researching points. Injection of CA brings new challenge to handover procedure for one thing, for another it could be used to support handover mechanism to overcome outage probability of user plane from handover of R10. In this paper we propose a handover...
Nonlinear Resource Allocation Problems are concerned with the optimal allocation of N continuous resources to M missions/tasks with nonlinear utilities. Numerous problems from diverse fields such as search theory, statistics, finance, economics, logistics, sensor and wireless networks fit this formulation. Several centralized/synchronous algorithms are available for solving this problem including...
We consider load balancing with routing games in a multiclass traffic environment. The servers are M/M/1 type servers and charge an admission price to each customer that joins the queue for service. Service requirements of all arriving customers are i.i.d. and they can receive service from any of the servers. Customers also have a waiting time cost that is proportional to their expected waiting times...
In this paper, we investigate the problem of assignment of K identical servers to a set of N parallel queues in a time slotted queueing system. The connectivity of each queue to each server is randomly changing with time; each server can serve at most one queue and each queue can be served by at most one server per time slot. Such queueing systems were widely applied in modeling the scheduling (or...
Deploying picocells overlaying Macrocells as the second tier has been regarded as a promising approach to enhance the spectrum efficiency and thus high data rate services, but only if cross-tier interference can be effectively controlled. Since both tiers shall support considerable numbers of users, interference mitigation by centralized/collaborated radio resource allocation among two tiers is infeasible...
In this paper, we study the cross-layer resource allocation for the secondary users (SUs) supporting heterogeneous services in interference-limited spectrum sharing system. Two classes of SUs are considered: delay-tolerant SUs (DT-SUs) and delay- sensitive SUs (DS-SUs). With the queue theory, the delay requirements of DS-SUs are transformed into constant rate requirements. Unlike most previous works,...
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