5,379 research outputs found
LTE and Wi-Fi Coexistence in Unlicensed Spectrum with Application to Smart Grid: A Review
Long Term Evolution (LTE) is expanding its utilization in unlicensed band by
deploying LTE Unlicensed (LTEU) and Licensed Assisted Access LTE (LTE-LAA)
technology. Smart Grid can take the advantages of unlicensed bands for
achieving two-way communication between smart meters and utility data centers
by using LTE-U/LTE-LAA. However, both schemes must co-exist with the incumbent
Wi-Fi system. In this paper, several co-existence schemes of Wi-Fi and LTE
technology is comprehensively reviewed. The challenges of deploying LTE and
Wi-Fi in the same band are clearly addressed based on the papers reviewed.
Solution procedures and techniques to resolve the challenging issues are
discussed in a short manner. The performance of various network architectures
such as listenbefore- talk (LBT) based LTE, carrier sense multiple access with
collision avoidance (CSMA/CA) based Wi-Fi is briefly compared. Finally, an
attempt is made to implement these proposed LTEWi- Fi models in smart grid
technology.Comment: submitted in 2018 IEEE PES T&
Joint User Scheduling and Power optimization in Full-Duplex Cells with Successive Interference Cancellation
This paper considers a cellular system with a full-duplex base station and
half-duplex users. The base station can activate one user in uplink or downlink
(half-duplex mode), or two different users one in each direction simultaneously
(full-duplex mode). Simultaneous transmissions in uplink and downlink causes
self-interference at the base station and uplink-to-downlink interference at
the downlink user. Although uplink-to-downlink interference is typically
treated as noise, it is shown that successive interference decoding and
cancellation (SIC mode) can lead to significant improvement in network utility,
especially when user distribution is concentrated around a few hotspots. The
proposed temporal fair user scheduling algorithm and corresponding power
optimization utilizes full-duplex and SIC modes as well as half-duplex
transmissions based on their impact on network utility. Simulation results
reveal that the proposed strategy can achieve up to 95% average cell throughput
improvement in typical indoor scenarios with respect to a conventional network
in which the base station is half-duplex.Comment: To be appeared in IEEE Asilomar Conference on Signals, Systems, and
Computers, 201
- …