In this paper we present VnL-TDMA, a new MAC (medium access control) protocol for accessing in TDMA a satellite channel shared among various earth stations which transmit mixed traffic (real-time and non-real time). We concentrate on the analysis of the real-time allocation for variable bit rate (VBR) traffic, and analyse its performance using a synthetically generated VBR traffic modelled on t...

Safety or mission critical applications have to recover from an error within an acceptable time window or it may potentially lead to disastrous effects or higher costs. The usual industrial practice is to employ fault tolerance using hardware redundancy where costs are highly exorbitant depending on the mission. In this paper, we present a framework for adaptive fault tolerance on the commonly ...

The paper discusses how Explicit Congestion Notification (ECN) can be used to devise an Internet congestion control mechanism that is more rapidly reactive and allows best-effort flows to rapidly adjust to fluctuations in available capacity. Our ECN-mod protocol involves simple modifications to TCP behavior and leverages more aggressive marking-based router feedback. Simulations show that ECN-m...

In best-effort networks, fairness has been used as a criterion to guide the design of traffic controls. The notion of fairness has evolved over time, from simple equality to a form of equality modulated by the user’s need (e.g. max-min and proportional fairness). However, fairness has always been defined on a per-user basis for a deterministic workload. In this paper, we argue that we must rede...

Communications systems often have many types of users. Since the users share the same resource, there is a conflict in their needs. This conflict leads to the imposition of controls on admission or elsewhere. In this paper, there are two types of customers, GP (Guaranteed Performance) and BE (Best Effort). We consider an admission control of GP customer which has two roles. First, to guarantee ...

Bluetooth is a personal wireless communication technology and is being applied in many scenarios. Current existing MAC (Medium Access Control) scheduling scheme only provides best-effort service for all master-slave connections. It is very challenging to provide QoS (Quality of Service) support for different connections due to the feature of Master Driven TDD (Time Division Duplex). This paper ...

Interactive control of 3D avatar motions has important applications in computer games and animations. Most of the current games directly map the inputs of a user into canned motions of the 3D character under control. However, an ideal user interface should be more like a human moving in the real life where appropriate motions are chosen according to the environment in the front. In this paper, ...

This paper presents and analyses the implementation of a novel active queue management (AQM) named FavorQueue that aims to improve delay transfer of short lived TCP flows over best-effort networks. The idea is to dequeue packets that do not belong to a flow previously enqueued first. The rationale is to mitigate the delay induced by long-lived TCP flows over the pace of short TCP data requests ...

Many recent works in control of electric power systems have investigated their synchronization through global performance metrics under external disturbances. The approach is motivated by fundamental changes the operation grids, particular substitution conventional plants with new renewable sources electrical energy. This will simultaneously increase fluctuations generation and reduce available...