QoS-aware resource management for LTE-Advanced relay-enhanced network

Abstract

Relaying is one of the major innovative concepts proposed in the recent years for cellular radio communication systems. It is a perfect solution for dealing with the issue of high variability of performance in cellular networks. By coordinated deployment at cell-edge or in shadowed areas, relay nodes can extend network coverage and increase the low end-user performance. Considering the advantages, relaying is recently being included in the standards of the fourth generation systems such as the LTE-Advanced and the WiMAX. However, one major problem of relaying is still to be resolved. Specifically, there are no concrete concepts for quality-of-service provisioning for relayed transmissions. This paper investigates the case of packet delivery times over multi-hop links in relay-enhanced networks. The discussion is specifically based on relaying implementation in the LTE-Advanced system. The quality-of-service satisfaction and its fairness for the base station and relay-node-connected users are analyzed in the framework of the utility theory. For the purpose of this analysis, utility functions are proposed for real-time traffic with minimum data rate and/or maximum packet delivery time requirements. Furthermore, several optimization concepts are proposed for managing multi-hop transmissions in a quality-of-service aware manner. The included analysis based on the LTE-Advanced system level simulations shows that the proposed optimizations have the potential to improve the overall quality-of-service satisfaction in a relay-enhanced system.

3GPP QoS-based scheduling framework for LTE

“…Mongha's and Zaki's proposals do not increase the user's priority when the HOL packet delay approaches its upper bound, and therefore, they are not well suited to satisfy the PDB. In [15], Gora proposes a QoS-aware resource management for LTE-A-based relay networks. Although his proposal concentrates on multi-hop relays, it presents valuable utility functions to satisfy the GBR and/or the PDB for real-time traffic.…”

Uplink resource allocation in cooperative OFDMA with multiplexing mobile relays

“…While only fixed relays' architecture is optimized in the standards [8], mobile relays are studied to offer dynamic relaying topology. Mobile relaying has been investigated in the Wireless World Initiative New Radio (WINNER) project [9] contributing in the development and the assessment of 3GPP LTE and IEEE 802.16 (WiMAX) [10] standards and in the Advanced Radio Interface Technologies for 4G Systems (ARTIST4G) project providing innovative concepts to cellular mobile radio communications [11].…”

Performance evaluation of video streaming on LTE with coexistence of Wi-Fi signal

“…LTE employs orthogonal frequency division multiplexing (OFDM) and single-carrier frequency division multiple access schemes for downlink and uplink multiple access schemes respectively [6]. Two of the significant building blocks in LTE-A is the bandwidth extension in the form of the carrier aggregation (CA) as well as heterogeneous network (HetNets) performance [7]. CA is employed to improve the capacity of the cell [8].…”