Resource allocation in optical wireless networks

Abstract

In this paper, self-organising interference management for optical wireless networks deployed inside an aircraft cabin is investigated. A user that has successfully received data in a given frame and intends to continue receiving data in the next frame broadcasts a busy burst (BB) in a time-multiplexed BB slot. A neighbouring access point (AP) that intends to reuse the reserved resource listens to the BB slot and infers (prior to transmission) the amount of co-channel interference (CCI) it could cause towards the user that has reserved the resource, provided that channel reciprocity holds. This is a vital information for an AP to decide without any central supervision whether to transmit or to defer the transmission to another time or frequency slot so as to limit CCI caused to the active link to a threshold value. Compared to using static resource partitioning for interference coordination, the proposed approach improves the median system throughput by 17% whilst delivering roughly the same throughput at the cell-edge. Moreover, it is demonstrated that the threshold parameter can be adjusted to tradeoff aggregate system throughput for user throughput at the cell-edge.

Resource allocation in optical beam-steered indoor networks

“…Further on, Dimitrov et al [22] discussed the importance of the Signal-to-Interference (SIR) ratio while dealing with indoor infrared optics. Based on these results, Ghimire et al [23] presented an algorithm for indoor infrared light networks. These cases focus their effort on solving the interference problem among channels and users.…”

Soft Handover in OFDMA Based Visible Light Communication Networks

“…Thus, orthogonal frequencydivision multiple access (OFDMA) can be utilized as a multiple access scheme in VLC networks. [8], [9] introduce fractional frequency reuse (FFR) based resource allocation for VLC networks employing OFDMA. In this work, we propose soft handover algorithms to maintain high data rates under mobility.…”

“…Since OFDM is promising in order to eliminate ISI, orthogonal frequency division multiple access can be utilized as multiple access scheme. FFR schemes are introduced for VLC in [8], [9]. Since overall frequency spectrum is divided into many subchannels in OFDMA, each sub-channel can be assumed as flat.…”

Unified Resource Allocation and Mobility Management Technique Using Particle Swarm Optimization for VLC Networks

“…In [12], a centralized resource allocation method for orthogonal frequency division multiple access (OFDMA) VLC system is proposed based on genetic algorithms to maximize system throughput. In [13], based on collision monitoring, a decentralized resource allocation method is introduced for OFDMA VLC systems. In the proposed system of [13], each AP is required to broadcast the information of utilized resources.…”

“…In [13], based on collision monitoring, a decentralized resource allocation method is introduced for OFDMA VLC systems. In the proposed system of [13], each AP is required to broadcast the information of utilized resources. Unlike the aforementioned studies [8]- [13] where traffic type and data rate requirements of the users are not considered, the work in [14] considers user satisfaction and addresses both resource allocation and load balancing for an orthogonal frequency division multiplexing (OFDM) VLC system, however, the proposed method does not consider the mobility of the user.…”