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In this work, we consider the problem of scheduling multicast real-time voice traffic in multi-channel, TDMA wireless mesh networks. The main challenges to solve this problem lie in (a) ensuring strict delay constraint while scheduling a real-time voice call, (b) providing admission control while maximizing the number of requests accepted and (c) scheduling a multicast voice call in an online manner...
Using network coding (NC) in wireless networks can potentially improve the throughput and energy efficiency. On the other hand, it may result in longer delay because packets arriving early at the relay node have to wait to be network coded with other packets. In contrast, using traditional relaying allows the data packets to be forwarded as soon as possible, while its overall lower throughput (compared...
Opportunistic schedulers improve the network capacity by allocating the network resources to users with good link qualities. A drawback of these schedulers is that they deprive the remaining users from receiving a fair share of the network resources, or violate their quality-of-service (QoS) requirements. Fair schedulers on the other hand impose a degree of fairness by allocating the network resources...
Providing LTE connectivity to emerging Machine-to-Machine (M2M) applications imposes several challenges to the operation and optimization of current and future 3GPP mobile broadband standard releases. Scheduling in an efficient way M2M traffic over the existing LTE MAC infrastructure is decisive for the smooth evolution towards an M2M-enabled LTE system. The large number of connecting devices compared...
In this paper a new cross-layer connection admission control (CAC) algorithm in WiMAX networks is proposed. The CAC algorithm makes the decisions whether accept or not the new connections based on the quality of channel communications. Moreover, the proposed CAC works together with an uplink scheduling mechanism which allocates the network resources in accordance with the information about the quality...
Quality of service (QoS) is an important issue in the deployment IEEE 802.16 networks with real-time and non-real-time traffic integration. IEEE 802.16j is an extension of IEEE 802.16 to support relay transmission. In this paper, we propose a dynamic hybrid distributed scheduling mechanism (DHSM) for IEEE 802.16j networks with non-transparent relay stations. First, we define a suitable priority for...
The Virtual Coordinate Multiple Access (VCMA) protocol is introduced and analyzed. VCMA is a medium access control protocol that defines transmissions schedules dynamically based on the assignment and exchange of virtual coordinates relative to an elected root node in a mesh network. VCMA is shown to attain feasible transmission schedules within a finite time, and its channel access delay properties...
The growth of different types of applications in the Internet arises the need for supporting Quality of Service (QoS) for them. Differentiating services aims to differentiate among applications in order to provide their requirements based on the level of QoS they need and their characteristics. In this paper we introduce a dynamic QoS-Aware queuing algorithm to differentiate services in IP basednetworks,...
Eligibility Based Round Robin (EBRR) scheduler proposed by Lenzini et al. is a packet scheduling algorithm which can be considered as an extension of Surplus Round Robin (SRR), computational complexity of which is O(1) even when quantum size is less than the maximum packet size. In this paper, we propose an extension of EBRR which makes it possible to transmit packets smaller than a threshold prior...
We focus on the problem of links scheduling in heterogeneous wireless sensor networks. Links scheduling becomes more difficult due to the diversity of workload among sensor nodes. An improper links scheduling strategy will lead to high end-to-end delay and then diminish the data availability. We assume the energy cost of state transition cannot be ignored, especially for wireless multimedia sensor...
To deal with problems that queuing information is not included in cognitive information when performing Resource Allocation (RA), a dynamic cross-layer scheme is proposed for the multimedia cognitive radio (CR) system with Orthogonal Frequency Division Multiplexing (OFDM). In this scheme, we consider that several crucial factors influence the RA decision, including channel state information, interference...
Flight landing optimization at the terminal area is an ongoing challenge for air traffic controllers. The current schedule scheme is first-come-first-served (FCFS). There are studies focusing on how to minimize the total cost or maximize the throughput. These schemes are short of fairness consideration. In this paper, we start from a real recent example to show that a lack of consideration of long-term...
Inter-cell Interference (ICI) in the uplink of modern cellular communication systems with high frequency reuse is hard to predict, as fast scheduling and link adaptation lead to a high interference fluctuation. This fluctuation poses a big challenge for link adaptation algorithms that need an accurate SINR estimate to assign suitable modulation and coding schemes for transmission. To enable ICI prediction...
In this paper an intelligent scheduling architecture is presented for LTE-Advanced downlink transmission, to enhance the Quality of Service (QoS) provision to different traffic types while maintaining system level performance in such as system throughput. Hebbian learning process and K-mean clustering algorithm are integrated in the Time Domain (TD) of scheduling architecture, to intelligently allocate...
In this paper the problem of delay tolerant message data transmission scheduling over Cognitive Radio (CR) enabled wireless networks is considered with special emphasis on high mobility users (vehicles). The proliferation of delay tolerant applications (social networking updates, emails, updates over the air to mention just a few) can drive efficient utilization of available spectrum by Secondary...
In this paper we have proposed a technique for cooperative localization where localization is done in distributive fashion without using any additional broadcast by nodes. The method relies on a fixed scheduled ultra-wideband (UWB) pulse transmissions by nodes in a predetermined way. The advantages of the proposed method is simpler hardware, comparatively less pulse transmission in the system hence...
Wireless sensor networks, WSNs, are an efficient way to deal with low-rate communications in confined environments such as mines or nuclear power plants because of their simplicity of deployment and low cost. In these application domains, WSNs are used to gather data from sensor nodes towards a sink in a multi-hop convergecast structure. In this paper, we focus on a traffic-aware time slot assignment...
For scheduling services with different features and Qos constraints, this paper proposes a hybrid scheduling strategy, in which delay-sensitive services are granted preemptive priority and non-delay-sensitive services are granted non-preemptive priority. Theoretical analysis verified that preemptive scheme results in longer waiting length of queue.
In this paper, we study the performance of solid-state drives that employ flash technology as storage medium. Our prime objective is to understand how the scheduling of the user-generated read and write commands and the read, write, and erase operations induced by the garbage-collection process affect the basic performance measures throughput and latency. We demonstrate that the most straightforward...
Third Generation partnership project long term evolution (3GPP LTE) requires low complexity, efficient scheduling policies to sustain optimal system operation while maintaining high level Quality of Service (QoS) to each active traffic flow. In sequel, the fairness principle is crucial in the design of a robust scheduler, due to buffer status, spectrum allocation limitations, intra-cell interference...
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