Learning to share: narrowband-friendly wideband networks
Proceedings of the ACM SIGCOMM 2008 conference on Data communication
Supporting demanding wireless applications with frequency-agile radios
NSDI'10 Proceedings of the 7th USENIX conference on Networked systems design and implementation
Practical, real-time, full duplex wireless
MobiCom '11 Proceedings of the 17th annual international conference on Mobile computing and networking
Adaptive Subcarrier Nulling: Enabling partial spectrum sharing in wireless LANs
ICNP '11 Proceedings of the 2011 19th IEEE International Conference on Network Protocols
Polyphase codes with good periodic correlation properties (Corresp.)
IEEE Transactions on Information Theory
Picasso: flexible RF and spectrum slicing
Proceedings of the ACM SIGCOMM 2012 conference on Applications, technologies, architectures, and protocols for computer communication
| Hi-index | 0.00 |
To support high data rate applications such as multimedia streaming, the ongoing standardization of the next generation Wi-Fi increases the channel bonding from 40 MHz in 802.11n to 80, and even 160 MHz under certain conditions in 802.11ac. However, inefficiency and unfairness issues arise when devices that use different channel widths coexist in a contention domain. A device with channel bonding has to wait until all bonded channels to be idle to commence a transmission while narrow channel interferers have more channel access opportunities. To address the inefficiency and unfairness issues in channel bonding, we propose an adaptive channel bonding (ACB) protocol in which a node is allowed to initiate a transmission as long as a narrow channel is available and gradually increase channel width during transmission whenever a new narrow channel becomes available. ACB aggregates all available narrow channels as one wide channel, removing the need of setting guard bands between contiguous narrow channels. A challenge in the design is the communication over uncertain channels. To enable fast spectrum agreement between transmitter and receiver, a partial spectrum correlation method is introduced. ACB also considers the severe contention in a wide band of spectrum. When new channels become available, multiple nodes may contend for them. A compound preamble is designed to make collisions detectable in the frequency domain and a parallel bitwise arbitration mechanism is introduced to quickly resolve the collisions in the time domain. We implemented and evaluated the ACB through the GNU Radio/USRP platform. Experimental results show that ACB can well address the inefficiency and unfairness issues caused by heterogeneous radio coexistence.