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&

Measurement and Optimization of LTE Performance

4G Long Term Evolution (LTE) mobile system is the fourth generation communication system adopted worldwide to provide high-speed data connections and high-quality voice calls. Given the recent deployment by mobile service providers, unlike GSM and UMTS, LTE can be still considered to be in its early stages and therefore many topics still raise great interest among the international scientific research community: network performance assessment, network optimization, selective scheduling, interference management and coexistence with other communication systems in the unlicensed band, methods to evaluate human exposure to electromagnetic radiation are, as a matter of fact, still open issues. In this work techniques adopted to increase LTE radio performances are investigated. One of the most wide-spread solutions proposed by the standard is to implement MIMO techniques and within a few years, to overcome the scarcity of spectrum, LTE network operators will offload data traffic by accessing the unlicensed 5 GHz frequency. Our Research deals with an evaluation of 3GPP standard in a real test best scenario to evaluate network behavior and performance

Enabling Fairness and QoS for LTE/Wi-Fi Coexistence in Unlicensed Spectrum

The increase of the number of interconnected devices, the Internet of Things (IoT) and new types of services have led to the development of new techniques to improve data transmission and new commercial opportunities in the telecommunications world. A possible solution that has attracted many telecom companies is the ability to expand their business by exploring new frequency bands, in particular the unlicensed spectrum. Licensed Assisted Access (LAA) is an LTE based technology that leverages the 5GHz unlicensed band along with licensed spectrum to deliver a performance boost for mobile device users. A key aspect of LAA is how to regulate access to the communication channel in order to maintain fairness between LTE and other technologies already present in this spectrum section. Listen Before Talk (LBT) is a technique used in radiocommunications whereby radio transmitters first sense its radio environment before it starts a transmission. However, the aggressive character of LTE is not always correctly managed by LBT. Based on this observation, we have tried to develop a new channel access method that makes LTE less invasive on the unlicensed spectrum, providing high performance services. The results obtained show that our algorithm is able to better balance resource sharing by ensuring that all technologies within the frequency band have good coexistence and high performance