Relaying is standardized in 3rd Generation Partnership Project (3GPP) Long-Term Evolution (LTE)-Advanced\r\nRelease 10 as a promising cost-efficient enhancement to existing radio access networks. Relay deployments\r\npromise to alleviate the limitations of conventional macrocell-only networks such as poor indoor penetration\r\nand coverage holes. However, to fully exploit the benefits of relaying, power control (PC) in the uplink should\r\nbe readdressed. In this context, PC optimization should jointly be performed on all links, i.e., on the\r\ndonor-evolved Node B (DeNB)-relay node (RN), the DeNB-user equipment (UE) link, and the RNââ?¬â??UE link. This\r\nensures proper management of interference in the network besides attaining a receiver dynamic range which\r\nensures the orthogonality of the single-carrier frequency-division multiple access (SC-FDMA) system. In this\r\narticle, we propose an automated PC optimization scheme which jointly tunes PC parameters in relay\r\ndeployments. The automated PC optimization can be based on either Taguchiââ?¬â?¢s method or a meta-heuristic\r\noptimization technique such as simulated annealing. To attain a more homogeneous user experience, the\r\nautomated PC optimization scheme applies novel performance metrics which can be adapted according to the\r\noperatorââ?¬â?¢s requirements. Moreover, the performance of the proposed scheme is compared with a reference\r\nstudy that assumes a scenario-specific manual learn-by-experience optimization. The evaluation of the\r\noptimization methods within the LTE-Advanced uplink framework is carried out in 3GPP-defined urban and\r\nsuburban propagation scenarios by applying the standardized LTE Release 8 PC scheme. Comprehensive results\r\nshow that the proposed automated PC optimization can provide similar performance compared to the\r\nreference manual optimization without requiring direct human intervention during the optimization process.\r\nFurthermore, various trade-offs can easily be achieved; thanks to the new performance metrics.
Loading....