Routing, spectrum access, and scheduling in multi-hop multi-channel wireless networks with MIMO links

Hang Liu, Lin Luo, Dengyuan Wu, Jiguo Yu, Dechang Chen
2015 EURASIP Journal on Wireless Communications and Networking  
Software-defined radios (SDRs) are a promising technology to enable dynamic channel access and sharing. Multiple Input Multiple Output (MIMO) is another radio technology breakthrough for increasing wireless network capacity. To obtain the full benefits brought by the SDR and MIMO technologies in wireless mesh networks (WMNs), the higher layer mechanisms should exploit their capabilities in a systematic way. In this paper, we investigate routing, channel assignment, link scheduling, and MIMO
more » ... uling, and MIMO transmission mode control in multi-channel multi-antenna wireless mesh networks. We first present a cross-layer framework for network performance optimization. Network traffic routing is established on a relatively long time scale to maintain system stability. We then proposed a stream controlled multiple access (SCMA) scheme, which is responsible for assigning frequency channels and scheduling links for data transmission and controlling MIMO transmission modes. It enables efficient spectrum access and sharing in time, frequency, and space, and adapts to varying network conditions. The evaluation results show that the proposed scheme greatly improves network performance compared to the traditional schemes. reuse. A MIMO transmitter can nullify its signal interference to the nearby receivers that do not want to receive the signal, and a MIMO receiver can suppress interference caused by undesired nearby transmitters. These benefits can be attained simultaneously by properly using different MIMO techniques, i.e. controlling MIMO operation mode. For example, spatial multiplexing and interference suppression can be realized together for achieving significant performance gain. Given its potential, MIMO has been adopted in next-generation WiFi, WiMax, and cellular network standards. SDR and MIMO are expected to greatly enhance spectrum efficiency and increase wireless network throughput. Particularly, in multi-hop wireless mesh networks (WMNs), one of the major problems is capacity reduction due to interference among multiple simultaneous transmissions [1]. A WMN can use SDR and MIMO to improve its performance in which nodes equipping with one or more MIMO-enabled SDR interfaces can flexibly access different frequency channels and employ spatial multiplexing and/or interference suppression on each channel
doi:10.1186/s13638-015-0252-2 fatcat:6tv4l4nhujaixh4hr4dbifmqvy