Coexistence of 802.11ah and 802.15.4g Networks

    •  Liu, Y., Guo, J., Orlik, P.V., Nagai, Y., Watanabe, K., Sumi, T., "Coexistence of 802.11ah and 802.15.4g Networks", IEEE Wireless Communications and Networking Conference (WCNC), DOI: 10.1109/​WCNC.2018.8376972, April 2018.
      BibTeX TR2018-214 PDF
      • @inproceedings{Liu2018apr,
      • author = {Liu, Ying and Guo, Jianlin and Orlik, Philip V. and Nagai, Yukimasa and Watanabe, Kotaro and Sumi, Takenori},
      • title = {Coexistence of 802.11ah and 802.15.4g Networks},
      • booktitle = {IEEE Wireless Communications and Networking Conference (WCNC)},
      • year = 2018,
      • month = apr,
      • doi = {10.1109/WCNC.2018.8376972},
      • url = {}
      • }
  • MERL Contacts:
  • Research Area:



IEEE 802.11ah and IEEE 802.15.4g are two wire-less technologies designed for outdoor IoT applications. Bothtechnologies have communication range up to 1000 meters.Therefore, 802.11ah network and 802.15.4g network are likely tocoexist. Our simulation results show that using standard definedcoexistence mechanisms, 802.11ah network can severely interferewith 802.15.4g network and lead to significant packet loss in802.15.4g network. As a result, additional coexistence controlmechanisms are needed. Due to asymmetrical features suchas modulation scheme and frame structure, 802.11ah devicesand 802.15.4g devices cannot perform automatic cooperation.Thus, self-coexistence control techniques are preferred. Thispaper proposes learning based self-coexistence control techniquesfor 802.11ah devices to mitigate the interference impact of802.11ah network on 802.15.4g network. We first present a a-Fairness based energy detection clear channel assessment (ED-CCA) method that enables 802.11ah devices to detect moreongoing 802.15.4g packet transmissions. We then introduce aQ-Learning based backoff mechanism for 802.11ah devices toavoid interfering with 802.15.4g packet transmission process.The proposed coexistence techniques can achieve fair spectrumsharing between 802.11ah network and 802.15.4g network.


  • Related News & Events

    •  NEWS    Mitsubishi Electric and MERL Help Develop IEEE Smart Meter Coexistence Standards
      Date: April 23, 2021
      MERL Contacts: Jianlin Guo; Philip V. Orlik
      Research Areas: Communications, Electric Systems
      • IoT applications such as smart metering system are rapidly increasing. A broad range of low power wide area communication technologies have been developed. These systems all operate in frequencies below 1 GHz, commonly called Sub-1 GHz frequency bands, to meet various application requirements. Several communication standards and proprietary technologies already use the Sub-1 GHz bands: IEEE 802.15.4g (Wi-SUN), IEEE 802.11ah (Wi-Fi HaLow), LoRa, SigFox and RFID. Due to limited spectrum in the Sub-1 GHz frequency bands, it is likely that applications will compete for the same resources and interfere with one another. This is a particular issue in Japan where the amount of license-exempt Sub-1 GHz frequencies is more limited than in other regulatory regions. Therefore, the coexistence becomes an issue to be addressed. Accordingly, IEEE New Standards Committee and Standard Board formed IEEE 802.19.3 Task Group in 2018 to develop guidelines and best practices for the coexistence of IEEE 802.11 and IEEE 802.15.4 based systems and to guide product deployment. MERL member Jianlin Guo took a lead role as Task Group Technical Editor, and was supported by Mitsubishi Electric Corporation researchers Yukimasa Nagai, Takenori Sumi and consultant Benjamin A. Rolfe (Task Group Chair) in the development of this standard. As of April 2021 a new standard recommended practice document, IEEE Recommended Practice for Local and Metropolitan Area Networks—Part 19: Coexistence Methods for IEEE 802.11 and IEEE 802.15.4 Based Systems Operating in the Sub‐1 GHz Frequency Bands, was published. This will help guide future IoT/smart metering system deployment. The standard is widely available for download from the IEEE Standards Association at