Abstract
The insufficient wireless frequency bands are likely to arise with the increase in mobile traffic demand. Many mobile operators suffer from a high annual increase in the cost of licensed wireless bands. Unlicensed bands present a potential opportunity for mobile operators. A single 5-GHz band with a large bandwidth provides faster transmission for each user. However, interference caused by existing wireless transmissions, such as Wi-Fi in unlicensed bands, is a serious issue in the effective utilization of unlicensed bands by mobile operators. The Listen-Before-Talk (LBT) was proposed as a promising method to ensure the coexistence of Wi-Fi and commercial mobile services such as LTE. We focus on effective control of the contention window (CW) size to maximize the operability of LBT. Control of the CW size depends on the repetition of extended clear channel assessment (ECCA). We introduce a dual threshold system that counts the repetition of ECCA. The newly developed NS-3-based unlicensed band network simulator shows the effectiveness of the proposed control mechanism. The results indicated that the advantage of the proposed method improves 4.3–7.6% than traditional LBT method. We develop a composite metric of throughput and fairness to evaluate the performance of LTE-LAA access.
Highlights
The widespread use of mobile devices and various highquality contents cause a significant increase in mobile internet traffic
Fair radio resource sharing between Wi-Fi access systems and LTE-LAA is a key issue in the utilization of unlicensed bands
2.1 Background The extended clear channel assessment (ECCA)-based channel access method is based on the European standard load-based equipment (LBE) [12]
Summary
The widespread use of mobile devices and various highquality contents cause a significant increase in mobile internet traffic. Fair radio resource sharing between Wi-Fi access systems and LTE-LAA is a key issue in the utilization of unlicensed bands. A novel technical standard for the LTE-LAA channel access method is required to guarantee fair radio resource sharing with Wi-Fi access systems over unlicensed bands. The Listen-Before-Talk (LBT) framework is a de facto standard of LTE-LAA channel access methods to aid in fair sharing over unlicensed bands. An analysis by Chen et al proved the effective sharing of LTE-LAA and Wi-Fi over the downlink unlicensed bands [13] They applied a Markov chain model to a simple LBT method. Extensive simulations and intuitive gradient-descending method indicate that the proposed dual threshold structure achieved high performance while guaranteeing fair radio resource sharing with Wi-Fi systems.
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