Mid-Term frequency domain scheduler for resource allocation in wireless mobile communications systems

详细信息    查看全文

• 作者：Á ; lvaro Pachó ; n^a ; ^{alvaro@icesi.edu.co}Author Vitae ; Ubaldo M. Garcí ; a-Palomares^b ; ¹ ; ^{ubaldo@det.uvigo.es}Author Vitae
• 关键词：Optimization ; Resource allocation ; LTE ; OFDMA
• 刊名：Computer Communications
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：97
• 期：Complete
• 页码：96-110
• 全文大小：2021 K
• 卷排序：97

文摘

This article approaches the dynamic resource allocation problem for the downlink of a wireless mobile communication system (WMCS). The article defines the architecture and functions of the global resource scheduler, as well as the quality index for scheduling, the signal to interference-plus-noise ratio (SINR). The proposed approach divides the scheduling task into two components: a distributed one, with local, short-term scope; and a centralized one, with global, medium-term scope. The optimization model considers a set of slack variables for guaranteeing feasibility. This allows the service provider to fully satisfy the users’ service demands. The model type is mixed, non-linear, which demands large computational power for an exact solution. So an approximate strategy is used, in order to decouple the search space. The time limit imposed to reach a solution forces to define a reduced neighborhood structure. Thus, the obtained results are the best solution obtained in the allotted time interval, evaluating a suitable set of neighbors, and using an objective, effective criterion for searching. The solution offers high levels of full service satisfaction (greater than 97%), low levels of service denial (less than 2%), and efficient power usage (30% in average).