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In this continuous fast world of mobile devices there is always a growing demand of high rate services. So a call has to be continuous with same data rates during a handoff. This paper deals with a novel approach DBA-CAC to reduce the call dropping probability while ensuring QoS demands are met in LTE wireless networks. The reduction is based on Adaptive Call Admission Control (Ad-CAC) scheme which...
In applications ranging from radio telescopes to Internet traffic monitoring, our ability to generate data has outpaced our ability to effectively capture, mine, and manage it. These ultra-high-bandwidth data streams typically contain little useful information and most of the data can be safely discarded. Periodically, however, an event of interest is observed and a large segment of the data must...
In recent years, due to its cost-effectiveness and ease of deployment, high latency network such as VSAT satellite network has been widely used to interconnect with people especially those in the rural areas. Since the VSAT satellite channels are widely used for real-time interactive multimedia applications that require relatively high bandwidth, this have led to greater demand for network bandwidth...
In this paper, we study the performance of some of the key scheduling algorithms such as Proportional Fair Scheduler, Modified Longest Weighted Delay First and Exponential Rule. We also propose a new algorithm called EXPQW, a variant of the Exponential rule which assigns weights to the subscriber stations based on their queue length and waiting time thereby ensuring fairness and quality of service...
Accelerated advancement in the world of microprocessor necessitates solving the bus contention in a most efficient manner. The major challenge is to reduce the latency of the system and to achieve a fair bandwidth allocation using maximum CPU utilization. Combination of Adaptive Arbitration algorithm and the processors according to their traffic behavior can be one of the feasible options to tackle...
The IEEE 802.16 standard is defined to meet the high-speed and wide-range data transmission in an efficient way. This paper studies the scheduling problem on IEEE 802.16e mesh networks to minimize the energy consumption of mobile stations so as to maximize the network lifetime. We consider the real-time connections and focus on the resource scheduling which includes time slots allocation, QoS guarantee...
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...
Sensor networks are expected to be used in hilly and mountainous area. In these usages, the sensor data should be transmitted to receivers in real-time. There are, however, networks where the use of UDP is not permitted. In the case of TCP transmission, transmission of the latest sensor data is delayed by TCP's retransmission control after connection outage recovers. In this paper, we have proposed...
8K×4K Super Hi-Vision (SHV) offers a significantly enhanced visual experience relative to 1080p, and is on its way to being the next digital TV standard. In addition, advanced 3DTV specifications involving a large number of camera views are targeted by emerging applications such as free-viewpoint TV (FTV). This paper presents a single-chip design that supports real-time H.264 decoding of SHV or up...
This paper presents a DiffServ based adaptive QoS model for real-time interactive traffic in constrained bandwidth IP network without over provisioning the users. A WRR based QoS scheduling algorithm has been implemented to allocate the network resources to the users. A tuning parameter for VBR real-time traffic is also introduced in order to provide fair performance to the non real-time traffic as...
It is very tedious and trivial if a network administrator has to manage all the equipment manually. Unfortunately, there are usually numerous and heterogeneous devices over which an administrator must watch. This paper proposes the design and development of an automatic event-driven system to reduce the burden on network administrators. By allowing managers to pre-define the action of some conditions,...
Diverse IP cores are integrated on a modern system-on-chip and share resources. Off-chip memory bandwidth is often the scarcest resource and requires careful allocation. Two of the most important cores, the CPU and the GPU, can both simultaneously demand high bandwidth. We demonstrate that conventional quality-of-service allocation techniques can severely constrict GPU performance by allowing the...
We propose and demonstrate an adaptive quality of transmission restoration scheme combining methods of lightpath rerouting and modulation format switching to combat real-time impairments in flexible bandwidth networks. Testbed demonstration achieved error-free performance.
This work presents a study of the effect of router buffer size on the subjective quality experienced by players of online games, which is a service with very tight real-time requirements. Quality estimators for other real-time services like e.g. VoIP were developed years ago, and they are commonly used when planning a new telephony system. They mainly use delay and loss as KPI (Key Performance Indicators)...
A modern real-time embedded system must support multiple concurrently running applications. To reduce costs, critical SoC components like SDRAM memories are often shared between applications with a variety of firm real-time requirements. To guarantee that the system works as intended, the memory controller must be configured such that all the real-time requirements of all sharing applications are...
The performance and power consumption of mobile DRAMs (LPDDRs) depend on the configuration of system-level parameters, such as operating frequency, interface width, request size, and memory map. In mobile systems running both real-time and non-real-time applications, the memory configuration must satisfy bandwidth requirements of real-time applications, meet the power consumption budget, and offer...
Concurrent trace is an emerging challenge when debugging multicore systems. In concurrent trace, trace buffer becomes a bottleneck since all trace sources try to access it simultaneously. In addition, the on-chip interconnection fabric is extremely high hardware cost for the distributed trace signals. In this paper, we propose a clustering-based scheme which implements concurrent trace for debugging...
Powering down SDRAMs at run-time reduces memory energy consumption significantly, but often at the cost of performance. If employed speculatively with real-time memory controllers, power-down mechanisms could impact both the guaranteed bandwidth and the memory latency bounds. This calls for power-down strategies that can hide or bound the performance loss, making run-time memory power-down feasible...
Rapid advancement in the world of microprocessor necessitates solving the bus contention in a most efficient manner. The major challenge is to reduce the latency of the system and to achieve a fair bandwidth allocation. Combination of Adaptive Arbitration algorithm and the processors according to their traffic behavior can be one of the feasible options to tackle the aforesaid problems due to its...
In this paper, we conduct a performance study on a game scenario that supports MMORPGs through structured P2P overlay, focusing on the churn aspect - the continuous process of peer arrival and departure. Through a discrete simulation, we show that a trade-off is necessary between the game features with respect to real-time stringency, and the churn performance. For instance, in the game scenario,...
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