Abstract
In networking systems such as cloud radio access networks (C-RAN) where users receive the connection and data service from short-range, light-weight base stations (BSs), users’ mobility has a significant impact on their association with BSs. Although communicating with the closest BS may yield the most desirable channel conditions, such strategy can lead to certain BSs being over-populated while leaving remaining BSs under-utilized. In addition, mobile users may encounter frequent handovers, which imposes a non-negligible burden on BSs and users. To reduce the handover overhead while balancing the traffic loads between BSs, we propose an optimal user association strategy for a large-scale mobile Internet of Things (IoT) network operating on C-RAN. We begin with formulating an optimal user association scheme focusing only on the task of load balancing. Thereafter, we revise the formulation such that the number of handovers is minimized while keeping BSs well-balanced in terms of the traffic load. To evaluate the performance of the proposed scheme, we implement a discrete-time network simulator. The evaluation results show that the proposed optimal user association strategy can significantly reduce the number of handovers, while outperforming conventional association schemes in terms of load balancing.
Highlights
IntroductionUtilizing short-range, low-power base stations (LPBSs) for wireless communication has been considered as a breakthrough in the information and communication technology (ICT) field
Utilizing short-range, low-power base stations (LPBSs) for wireless communication has been considered as a breakthrough in the information and communication technology (ICT) field. the conventional cell towers or macro base stations have advantages such as large coverage, they are associated with high operating expenses (OPEX) and capital expenditure (CAPEX) for their maintenance and installation, respectively, as well as low cell-edge user throughput
We studied a cloud radio access networks (C-RAN) with large-scale Internet of Things (IoT) devices
Summary
Utilizing short-range, low-power base stations (LPBSs) for wireless communication has been considered as a breakthrough in the information and communication technology (ICT) field. The conventional cell towers or macro base stations (macro BSs or MBSs) have advantages such as large coverage, they are associated with high operating expenses (OPEX) and capital expenditure (CAPEX) for their maintenance and installation, respectively, as well as low cell-edge user throughput. LPBSs have been considered as an alternative solution to solve these issues. Their key advantage is the short distance between the transmitter and receiver that guarantees the high channel gain. The short coverage increases the spatial reuse [1]. This technology was widely discussed in relation to third generation partnership program (3GPP) long-term evolution (LTE)
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