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In this study, a hybrid user association scheme for maximising energy efficiency is proposed in a wireless uplink heterogeneous network with human-to-human and machine-to-machine communications coexistence. Different from conventional user association algorithms, the authors consider access control protocol for both the human-type-communications (HTCs) users equipments’ (UEs) and machine-type-communications...
A novel intra-cell frequency planning scheme based on interference coordination is exploited for cellular Orthogonal Frequency Division Multiplexing (OFDM)-Relay systems. In this strategy, a factor RI is introduced to model the interference in the 2nd slot. According to RI and the signal-to-interference-plus-noise ratio, the scheduler groups all the users into three sets. Furthermore, the total spectrum...
In this paper, heterogeneous services in multiuser multiple-input multiple-output (MIMO)-Relay systems are investigated, where the relays work in amplify-and-forward mode. A utility based adaptive scheduling algorithm is proposed, which aims to maximize user satisfaction as well as system spectral efficiency. Joint optimal carriers and spatial subchannels allocation is considered based on the proposed...
Energy-constraint is a crucial problem in wireless sensor networks (WSNs). Many sensor node (SN) placement schemes and routing protocols are proposed to address this problem. In this paper, we first present how to place SNs by use of a minimal number to maximize the coverage area when the communication radius of the SN is not less than the sensing radius, which results in the application of regular...
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