SBT (Sense Before Transmit) Based LTE Licenced Assisted Access for 5 GHz Unlicensed Spectrum

Uplink performance enhancement for LTE licensed-assisted access to unlicensed spectrum

Licensed-assisted access (LAA) is a new operation mode of carrier aggregation for the Long Term Evolution Advanced systems to transmit data on both licensed and unlicensed spectrum. To deal with the issue of co-existence with WiFi systems, LAA is required to perform listen-before-talk, which can significantly impact its resource utilization. In this paper, the concept called multi-subframe sche...

Analytical Model for Coexistence Performance Evaluation of WiFi and LTE Licensed-Assisted Access to Unlicensed Spectrum

—LTE Licensed-Assisted Access (LAA) to unlicensed spectrum has been considered as an effective complement in offloading growing traffic since its emergence at 3GPP. Since 2015, 3GPP has launched standardization to develop LAA as a key technology for LTE-Advanced unlicensed spectrum deployment in Rel-13. In this paper, an analytical model is built for the performance evaluation of typical coexi...

U-LTE: Unlicensed Spectrum Utilization of LTE

Coexistence of Wi-fi and Laa-lte in Unlicensed Spectrum

ACKNOWLEDGEMENTS First and foremost, I would like to especially thank my mother, father and families, without whose guidance and support I would not be here. Besides, I would like to present my sincere gratitude to my supervisor, Dr Raghu-pathy Sivakumar. Under his guidance, I got valuable advice and encouragements. I joined in GNAN research group without much research experience. Because of Si...

Enabling Fair Spectrum Sharing between Wi-Fi and LTE-Unlicensed

Due to the fast increase of mobile traffic, most mobile network operators face the congestion issue in licensed spectrum bands. Several telecommunication vendors and operators propose to expand LTE service to the unlicensed spectrum bands to relieve the traffic congestion. However, LTE in unlicensed spectrum may interfere with Wi-Fi communications in the same bands and cause significant decreas...