Abstract
To improve the system capacity and accommodate the ever-increasing demand for bandwidth by the network users, LTE service providers have turned their attention to the unlicensed industrial, scientific, and medical (ISM) spectrum; currently heavily utilized by the users of the IEEE 803.11 standards or WiFi. Unfortunately, such an approach, referred to as LTE-U, causes co-existence problems which necessitates the development of effective spectrum-sharing mechanisms to mitigate the interference with WiFi users. In this work, we propose a framework for video transmission over LTE-U to achieve harmonious coexistence with WiFi systems while taking into account the quality of experience (QoE) requirements of the user equipment (UE). In the proposed scheme, the channel allocation aims to enhance the peak signal-to-noise ratio (PSNR) and to reduce the end-to-end delay of video packets. We present analytical schemes for predicting PSNR and delay of the received video sequence based on video parameters transmitted by the video server and periodic feedback from the UE, which provides the signal-to-noise ratio (SNR) of the channel. In addition, the probability of causing interference to WiFi users is used to formulate the channel allocation problem as a multi-objective optimization problem. Taking into account the received video quality and the achieved inter-frame delay for both LTE-U and WiFi users, the simulation results show that the proposed scheme outperforms a reference model that employs a channel access mechanism but randomly assigns frames to the available channels.
Highlights
The number of mobile devices is expected to exceed 12 billion by the year 2022, which will cause the monthly traffic to approach 80 exabytes, more than 50% of which will be serving video applications [1]
The scheme dynamically assigns user equipment (UE) video frames to channels based on three factors: predicted peak signal-to-noise ratio (PSNR), predicted delay, and interference caused to WiFi
In this article, we presented a dynamic channel selection scheme for video transmission over Long-term evolution (LTE)-U that accounts for quality of experience (QoE) requirements of the LTE-U UEs while simultaneously striving to minimize interference caused to WiFi
Summary
The number of mobile devices is expected to exceed 12 billion by the year 2022, which will cause the monthly traffic to approach 80 exabytes, more than 50% of which will be serving video applications [1]. An additional solution that has been proposed to mitigate the bandwidth scarcity problem is to allow LTE operators to use some of the b frequency bands in the unlicensed spectrum [2]. The proposed scheme takes into account the QoE requirements of UEs and jointly aims to achieve harmonious coexistence with WiFi. The scheme dynamically assigns UE video frames to channels based on three factors: predicted peak signal-to-noise ratio (PSNR), predicted delay, and interference caused to WiFi. The contributions of the paper can be summarized as follows.
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