Open AccessHybrid radio resource allocation and interference coordination for type 1a‐relayed long term evolution uplink
Author(s) -
Ahmed Irfan,
Mohamed Amr
Publication year - 2014
Publication title -
iet communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.355
H-Index - 62
eISSN - 1751-8636
pISSN - 1751-8628
DOI - 10.1049/iet-com.2014.0028
Subject(s) - computer science , telecommunications link , relay , scheduling (production processes) , knapsack problem , mathematical optimization , cellular network , resource allocation , user equipment , computer network , base station , algorithm , mathematics , power (physics) , physics , quantum mechanics
Relay technology has been included in long term evolution (LTE) cellular system through 3GPP Release 10. Relay‐based LTE cellular system is one of the most promising technologies to enhance the throughput and coverage of access network. Deployment of relays in a cell opens many issues of frequency/time domain radio resource allocation and frequency planning. In this study, the authors consider the uplink of LTE relay‐assisted network and formulate the joint scheduling and intra‐cell interference mitigation as a non‐linear optimisation problem. They take into account the projection of the gradient of user's utility function over the user's rate vector based on Lagrangian method. They propose a novel transformation of scheduling problem into combinatorial Knapsack optimisation to convert the optimisation problem into binary integer non‐linear program. Finally, they present an alternate solution through a low complexity algorithm to allocate resources based on group of resource blocks, whereas considering the contiguity constraint. Simulation results show that the proposed scheme is near optimal with a much lower complexity order.