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.
Highlights
In the year 2008, the International Telecommunication Union, Radiocommunication Sector (ITU-R) issued the M.2134 report [1] specifying requirements for the generation of radio communication systems, the so-called International Mobile Telecommunication-Advanced (IMTA)
The baseline of this technology is the introduction of a new type of access points, relay nodes (RNs), capable of dynamic setting-up its own backhaul (BH) link connection over a common radio interface, i.e., the same that is used for serving users
The PDB-aware scheduling focuses on satisfying the packet delivery time requirement for all users resulting in the lowest Packet dropping rate (PDR) at the initial stage of the system operation
Summary
In the year 2008, the International Telecommunication Union, Radiocommunication Sector (ITU-R) issued the M.2134 report [1] specifying requirements for the generation of radio communication systems, the so-called International Mobile Telecommunication-Advanced (IMTA). Considering an H-hop connection, the end-to-end delivery time (te2e) for a data packet can be generally estimated as the sum of the number of times required to perform the three aforementioned operations at each of the H transmission hops, i.e., as follows: XH À Of this paper, it is analyzed up to what extent the LTE-A relaying configurations are able to satisfy the QoS requirements of real-time services and what impact they have on the packet delay budget.
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