A Study of Hidden Node Avoidance in Lte Licensed Assisted Access (Laa) Networks Based on Full Duplex Radio (Fdr) Technology(2/2)

Project Details


As the rapid development of network technology, Internet has become an integral part of our lives. With the popularity of smart mobile devices, surfing the Internet anytime, anywhere has become a kind of necessity for the modern life. How to combine the coming mobile communication technologies with other existent technologies to support more networking services in mobile networks is one of the major issues.The 4G LTE-A standard developed by ETSI 3GPP organization is the main trend of the future wireless mobile communication industry. The 4G LTE-A standard adopts small cell as well as unlicensed spectrum (5.8GHz LTE-U) to offload heavy traffic from licensed band to unlicensed band. Such technology is known as Licensed Assisted Access (LAA) technology. On the other hand, the development of IEEE 802.11 standard is matured everywhere. All IEEE 802.11 products use CSMA/CA with request-to-send/clear-to-send (RTS/CTS) protocol to solve contention and hidden-node problems. Therefore, the LTE-U shall have the new mechanism to coexist with pervasive IEEE 802.11 products. Therefore, how to avoid the effects of operating LTE-U on unlicensed band, where there are IEEE 802.11 products, is the research objective of this project.The Listen-Before-Talk (LBT) procedure is the main procedure for LAA to accomplish fair and friendly coexistence with other operators or technologies operating over unlicensed spectrum. However, lacking the Layer 2 protocol with the other existing systems, it is uneasy to solve the hidden-node problem. Recently, the Full Duplex Radio (FDR) technology has been proposed for allowing devices to transmit and receive data simultaneously. Our idea is to utilize the FDR for LAA device to transmit specific signals to reserve channel while receiving data packets from another device on unlicensed spectrum. This project will study the interesting mechanism combining the FDR technology with LBT protocol to solve hidden-node problem as well as optimize the system performance.
Effective start/end date1/08/1731/10/18

UN Sustainable Development Goals

In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This project contributes towards the following SDG(s):

  • SDG 11 - Sustainable Cities and Communities
  • SDG 17 - Partnerships for the Goals


  • Long-Term Evolution (LTE)
  • Listen-Before-Talk (LBT)
  • Hidden Node Problem (HNP)
  • Full-Duplex Radio (FDR)


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