Abstract
Abstract Modern Wi-Fi networks are trending towards using a wider channel bandwidth to achieve high physical layer data rate. The wide channel band experiences fluctuations across the different frequencies, causing diversity in the frequency domain. Frequency-aware Wi-Fi protocols exploit this frequency diversity and consequently achieve high wireless capacity. However, most of the existing works have not considered quality-of-service (QoS) issues. In this paper, we present a new Wi-Fi protocol called QoS-Fi, that provides QoS for the mobile users in the frequency aware Wi-Fi network. QoS-Fi dynamically assigns orthogonal frequency division multiplexing (OFDM) subchannels for heterogeneous mobile users to meet the QoS demands. To achieve this goal, we apply an OFDM-based variable-length Bloom filter (VBF) that synergistically integrates the channel quality estimation and QoS channel coordination. To the best of our knowledge, this is the first work that employs QoS at the frequency domain for Wi-Fi networks. We study the impact of variable-length signatures in the aspect of throughput maximization and meeting the QoS requirements and further develop a decentralized QoS-aware channel-allocation algorithm that achieves sub-optimal performance. Our USRP/GNURadio-based experiments and trace-driven simulations show that QoS-Fi provides up to 1.39 × and 1.29 × throughput improvements compared to the legacy EDCA and well-known Knopp and Humblet’s and round robin (K&H/RR) scheduling, respectively in the QoS-regimes.
Highlights
The recent development of communication technologies has enabled Wi-Fi networks to achieve high physical data rates
7 Conclusions We presented QoS-Fi, a novel QoS provisioning WiFi PHY/MAC protocol based on the orthogonal frequency division multiplexing (OFDM) technique
We showed the feasibility of QoS-Fi by implementing it on a universal software radio peripheral (USRP)/GNUradio testbed
Summary
The recent development of communication technologies has enabled Wi-Fi networks to achieve high physical data rates. It is challenging to be both aware of the frequency diversity and meet these QoS demands for real-time applications in Wi-Fi networks. Our previous work [7] proposes the Wi-Fi protocol that achieves the above objectives by using an OFDMbased Bloom filter These schemes generally achieve high wireless capacity via frequency diversity awareness. QoS-Fi dynamically assigns OFDM subchannels to heterogeneous real-time mobile users depending on their QoS requirements To achieve this goal, we apply an OFDM-based variable-length Bloom filter (VBF) [14] that synergistically integrates two operations: (i) the channel quality estimation for exploiting frequency diversity and (ii) the frequency-aware channel coordination to meet the QoS requirements. After the AP makes a decision for the subchannel allocation based on the channel qualities and QoS demands, it broadcasts the Q-CRP frame to inform the STAs of the coordination result.
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