Magnus Hurd

Efficient QoS over LTE — A scheduler centric approach

With increasing use of smart phones and mobile broadband, efficient differentiation of traffic is essential for system stability and user satisfaction. In this paper we propose a scheduler centric approach to traffic differentiation (called QoS in this paper) over LTE, in which the scheduler acts as a core entity assisted with congestion control and admission control. The scheduler is responsible for enforcing the wanted differentiation; it guarantees that high priority bearers, which are in danger of not fulfilling their QoS contract, receive necessary resources. The bearer based congestion control reacts on scheduling decisions and removes bearers with insufficient resources. The admission control algorithm takes decisions using load measurements from the scheduler. Simulation results with a mixed traffic scenario show that applying the proposed approach guarantees GBR bearers sufficient resources efficiently in the order of set priorities while background bearers utilize the remaining resources.