The legacy approach to solve coexistence problems between multiple wireless networks operating in the same frequency bands is through network planning. However, this approach is often unfeasible in unlicensed (shared) bands, where different network …
Wireless networks operating in unlicensed bands generally use one of two channel access paradigms: random access (e.g., Wi-Fi) or scheduled access (e.g., LTE License Assisted Access, LTE LAA and New Radio-Unlicensed, NR-U). The coexistence between …
Wireless technologies coexisting in unlicensed bands should receive a fair share of the available channel resources, even when they use different access methods. We consider the problem of coexistence between Wi-Fi and New Radio Unlicensed (NR-U) …
Last year I proposed a topic for an engineering thesis and I’m happy to report that two students have separately developed two Python-based IEEE 802.11 channel access simulators:
Cecylia Borek developed DCF-NumPy, Paweł Topór developed DCF-SimPy. Both tools simulate channel access for 802.11’s distributed coordination function (DCF) assuming 802.11a PHY parameters and network saturation. Also, the code for both tools is available on GitHub.
DCF-NumPy is a Monte Carlo simulator which loops over 802.
Coexistence between cellular systems and Wi-Fi gained the attention of the research community when LTE License Assisted Access (LAA) entered the unlicensed band. The recent introduction of NR-U as part of 5G introduces new coexistence opportunities …
Multi-hop ad hoc networks may employ cooperative communication, in which opportunistic relays use the spatial diversity of radio channels to increase communication reliability. An emerging variant of traditional relaying and forwarding schemes is the …
The problem of Wi-Fi and LTE coexistence has been significantly debated in the last years with the emergence of LTE extensions enabling the utilization of unlicensed spectrum for carrier aggregation. Rather than focusing on the problem of resource …
Current communication standards and systems are not prepared for their application in unpredictable (lossy) environments. We present CLF-MAC - a new MAC protocol supporting the concepts of lossy forwarding and joint decoding, which implements channel …
We present in this paper a MAC layer protocol capable to cope with lossy links in interference-prone wireless environments. Our approach exploits the recent advances in information theory and physical layer coding by relaying at intermediate nodes …