A new Channel- and QoS-Aware scheduling Scheme for Real-time Services in LTE Network

Abstract

This paper proposes a new scheduling scheme which is based on Channel-and QoS-Aware for real-time traffics in LTE downlink direction. The real-time services (VoIP, Video, etc.) are very sensitive to network impairments such as delay, packet loss, jitter, etc. The proposed scheduling scheme considers Maximum Queue Size (MQS) as an essential factor for the priority metric and the combination of well-known M-LWDF-based algorithms such as M-LWDF, VT-MLWDF and Queue-HOL-MLWDF. The simulation results show that the proposed scheme has the performance which not only satisfies QoS requirements of realtime services but also outperforms the M-LWDF, VT-MLWDF and Queue-HOL-MLWDF schedulers in terms of Packet Loss Rate (PLR), cell throughput, Fairness Index (FI) and Spectral Efficiency (SE), especially for Video flow. The proposed scheduler also significantly improves the delay in comparison with the VT-MLWDF and Queue-HOL-MLWDF schedulers ones for both VoIP and Video flows. The performance evaluation is compared in terms of Delay, PLR, Throughput, FI and SE for M-LWDF, VT-MLWDF, Queue-HOL-MLWDF and the proposed schedulers.

A Quality of Service (QoS) Aware Scheduling Algorithm to Boost QoS of Cell-Edge Users in LTE Networks

“…The features are fragmented into some functional entities. 3GPP has specified a new packet core called Evolved Packet Core (EPC) network architecture to support the Evolved Universal Terrestrial Radio Access Network (E-UTRAN) over a decrease in number of network components [3]. The Service Provider experiences a flawless mobility with LTE architecture.…”

“…Fig 1 shows the logical depiction of LTE network architecture. The LTE architecture is very much analogous to GSM architecture [3]. LTE architecture consists of 2 components: (1) Core Network and (2) Access Network.…”

“…An evolved system is formed by E-UTRAN and EPC [3][5]. To expand the system strength, ciphering has been introduced and characterized by using an extra layer to protect security key and other important information.…”

“…In default configuration, 7 symbols are used [2]. The data transmission in LTE / LTE-A is organized as physical resources which are represented by a time-frequency resource grid consisting of Physical Resource Blocks (PRB) [3][6] [9]. The allocation of RBs is performed by a scheduler present at eNB.…”

“…The 3GPP LTE is very flexible radio interface. As per work on the latest release of the LTE standard, the main attention is just to slowly build the routes for the further evolution of LTE, known as LTE-A [3]. The primary objective of this evolution is to reach and even exceed the requirements of International Mobile Telecommunications -Advanced (IMT-A) [11].…”