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Sebastian Bräuer, Anatolij Zubow and Falko Dressler, "Towards Software-Centric Listen-Before-Talk on Software-Defined Radios," Proceedings of IEEE Wireless Communications and Networking Conference (WCNC 2021), Nanjing, China, March 2021.


Listen-Before-Talk (LBT) is an essential function of many MAC protocols and a key mechanism of sharing spectrum in an uncoordinated manner. However, this simple but effective concept remains a major challenge for Software-Defined Radios (SDRs). If performing the protocol stack on a host PC, due to their structure, SDRs have inherent latencies built in. These latencies increase their reaction time, the so-called turnaround time, significantly, compared to their conventional radio counterparts. Unfortunately, this means that they can- not comply with the LBT channel access procedures used in modern protocols like IEEE 802.11 or LTE Licensed-Assisted Access (LTE-LAA). Given the flexibility and rapid-prototyping capabilities of SDRs, these protocols could clearly benefit from such SDR-based implementations. In this paper, we fill this gap and present a design approach for SDRs supporting LBT. We particularly focus on the rather complicated timing issues. As a proof-of-concept, we showcase our LBT-enabled implementation of the srsLTE software stack for LTE.

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Sebastian Bräuer
Anatolij Zubow
Falko Dressler

BibTeX reference

    author = {Br{\"{a}}uer, Sebastian and Zubow, Anatolij and Dressler, Falko},
    doi = {10.1109/WCNC49053.2021.9417395},
    title = {{Towards Software-Centric Listen-Before-Talk on Software-Defined Radios}},
    publisher = {IEEE},
    address = {Nanjing, China},
    booktitle = {IEEE Wireless Communications and Networking Conference (WCNC 2021)},
    month = {3},
    year = {2021},

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Last modified: 2024-07-21