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Wi-Fi and LTE-LAA coexistence problems, challenges and features in 5GHz unlicensed bandwidth

Maqsood Sulaimani, Seçkin Arı
2019 Sakarya University Journal of Science  
The simulation results illustrate that LTE-LAA based-LBT channel access mechanism by alone cannot bring a fair coexistence between these two technologies, and it needs further improvement. /0000-0001-7556  ...  Finally, simulations are provided for LTE-LAA based Listen Before Talk (LBT) mechanism and Wi-Fi to show that LTE-LAA with LBT mechanism is friendly to the Wi-Fi networks when using the same 5GHz unlicensed  ...  LTE-LAA channel access mechanism is based on LBT, a similar mechanism to Wi-Fi Carrier Sense Multiple Access/ Collision Avoidance (CSMA/CA).  ... 
doi:10.16984/saufenbilder.557409 fatcat:d5qhyczblvhzdfui2mynhvfsvu

ORLA/OLAA: Orthogonal Coexistence of LAA and WiFi in Unlicensed Spectrum

Andres Garcia-Saavedra, Paul Patras, Victor Valls, Xavier Costa-Perez, Douglas J. Leith
2018 IEEE/ACM Transactions on Networking  
The 3 rd Generation Partnership Project (3GPP) has recently defined a License Assisted Access (LAA) scheme to enable global Unlicensed LTE (U-LTE) deployment, aiming at (i) ensuring fair coexistence with  ...  We derive two LAA optimal transmission policies, ORLA and OLAA, that maximize LAA throughput in both asynchronous and synchronous (i.e., with alignment to licensed anchor frame boundaries) modes of operation  ...  Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA), and Long Term Evolution (LTE), which is inherently a scheduled paradigm, makes the design of U-LTE channel access protocols particularly  ... 
doi:10.1109/tnet.2018.2876590 fatcat:ll5yac6vy5edlhv6wd5fk5xls4

On Quality-of-Service Provisioning in IEEE 802.11ax WLANs

Der-Jiunn Deng, Shao-Yu Lien, Jorden Lee, Kwang-Cheng Chen
2016 IEEE Access  
In WLANs, medium access control protocol is the key component that enables efficient sharing the common radio channel while satisfying the quality of service (QoS) requirements for multimedia applications  ...  With the new physical layer design and subsequent new medium access control functions under more demands on QoS and user experience, in this paper, we first survey the QoS support in legacy 802.11.  ...  Jiayin Zhang, for the fruitful and useful technical discussions, which are of great help on preparing the paper. Thanks to Prof.  ... 
doi:10.1109/access.2016.2602281 fatcat:2wi7hxlqbvgmrfvicftc5r6bne

ORLA/OLAA: Orthogonal Coexistence of LAA and WiFi in Unlicensed Spectrum [article]

Andres Garcia-Saavedra, Paul Patras, Victor Valls, Xavier Costa-Perez,, Douglas J. Leith
2018 arXiv   pre-print
The 3GPP has recently defined a Licensed-Assisted Access (LAA) scheme to enable global Unlicensed LTE (U-LTE) deployment, aiming at (i) ensuring fair coexistence with incumbent WiFi networks, i.e., impacting  ...  on their performance no more than another WiFi device, and (ii) achieving superior airtime efficiency as compared to WiFi.  ...  In essence, since the LAA access procedure fundamentally resembles that of WiFi's CSMA/CA it does have the ability to provide fairness; however, increases in MAC efficiency are achieved at the cost of  ... 
arXiv:1802.01360v1 fatcat:yr4buwsagrct3hoyoaom2cio4a

Performance-Fairness Trade-off for Wi-Fi and LTE-LAA Coexistence

Rabbia Saleem, Sheeraz A. Alvi, Salman Durrani
2021 IEEE Access  
In this paper, an optimal communication policy is devised for LAA stations coexisting on a single unlicensed channel with Wi-Fi stations.  ...  The inter-network collisions are avoided through nonoverlapping transmission phases for Wi-Fi and LAA networks.  ...  A Wi-Fi network follows IEEE 802.11a Distributed Coordination Function (DCF) based on the Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) mechanism to coexists with one another [14] .  ... 
doi:10.1109/access.2021.3075252 fatcat:pb3bcutsnndzfacnrid3mxwonu

A Survey of Resource Allocation Techniques for Cellular Network's Operation in the Unlicensed Band

Mohammedhusen Manekiya, Abhinav Kumar, Ashish Yadav, Massimo Donelli
2020 Electronics  
With an ever increasing demand for data, better and efficient spectrum operation has become crucial in cellular networks.  ...  The key channel access mechanisms for cellular network's operation in the unlicensed bands are discussed. The various channel selection techniques are explored and their operation explained.  ...  A comprehensive summary of the various studies on the fairness of CSAT and LAA-LBT based channel access mechanisms along with various channel selection schemes is presented in Table 1 .  ... 
doi:10.3390/electronics9091464 fatcat:sypt3whq45genofkl3thihnjtq

KQI Performance Evaluation of 3GPP LBT Priorities for Indoor Unlicensed Coexistence Scenarios

Eduardo Baena, Segio Fortes, Raquel Barco
2020 Electronics  
In this sense, 3GPP has proposed a traffic prioritization method based on the Listen Before Talk access parameters, defining a series of priorities.  ...  The rapid proliferation of user devices with access to mobile broadband has been a challenge from both the operation and deployment points of view.  ...  ] based on CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance).  ... 
doi:10.3390/electronics9101701 fatcat:5xkvqmjj3zbb5faxk7fy2e6i6e

Coexistence of Cellular and IEEE 802.11 Technologies in Unlicensed Spectrum Bands -A Survey

Rony Kumer Saha
2021 IEEE Open Journal of the Communications Society  
Further, we summarize scenarios and categories of coexistence mechanisms, conditions for a fair coexistence, and coexistencerelated features.  ...  We then review the operation of cellular technologies, namely Long-Term Evolution Unlicensed (LTE-U), Licensed Assisted Access (LAA), and New Radio Unlicensed (NR-U), worldwide in the unlicensed spectrum  ...  LBT is a contention-based medium access technique similar to the Carrier-Sense Multiple Access with Collision Avoidance (CSMA/CA) mechanism used by WiFi [13] that shares a channel between a cellular  ... 
doi:10.1109/ojcoms.2021.3106502 fatcat:3z23adopcjh67cynddlpndcln4

Coordinated Dynamic Spectrum Sharing for 5G and Beyond Cellular Networks

Jeongho Jeon, Russell D. Ford, Vishnu V. Ratnam, Joonyoung Cho, Jianzhong Charlie Zhang
2019 IEEE Access  
However, the question remains how to best utilize this spectrum and build efficient networks, and if the time has come for newer approaches to be considered for the next generation system.  ...  To this end, we demonstrate that with the proposed framework both throughput and access delay can be significantly improved over the state-of-the-art LAA system.  ...  IEEE 802.11 a/n/ac Wi-Fi technologies, operating in the 5 GHz band, use a channel access mechanism based on CSMA/CA with exponential random backoff. 2 Release 13 LAA introduced downlink (DL)-only access  ... 
doi:10.1109/access.2019.2934385 fatcat:k3tl7ywhefeyxpkxj4ru3fr6ty

Survey of Spectrum Sharing for Inter-Technology Coexistence [article]

Andra M. Voicu, Ljiljana Simić, Marina Petrova
2017 arXiv   pre-print
Using this framework, we present a literature review on inter-technology coexistence with a focus on wireless technologies with equal spectrum access rights, i.e.  ...  Moreover, we reflect on our literature review to identify possible spectrum sharing design solutions and performance evaluation approaches useful for future coexistence cases.  ...  For example, a single device is allowed to transmit for a shorter time duration (e.g. time division multiple access -TDMA -in cellular networks, carrier sense multiple access with collision avoidance -  ... 
arXiv:1712.08589v1 fatcat:m6yymcpsxbhutgkf7l6o53fecm

On the Fairness of Wi-Fi and LTE-LAA Coexistence [article]

Morteza Mehrnoush, Sumit Roy
2018 arXiv   pre-print
The formal notions of access and proportional fairness is then considered for these scenarios to compare and contrast with the 3GPP definition.  ...  However, the fairness of Wi-Fi and LTE-LAA sharing is a topic that has not been adequately explored.  ...  Wi-Fi networks have been architected from inception for sharing among in-network nodes via the carrier sense multiple access collision avoidance (CSMA/CA) -a distributed random access mechanism.  ... 
arXiv:1805.03501v1 fatcat:gobkhbzn2rcq5ftpec43hhxt34

Applications of Intelligent Radio Technologies in Unlicensed Cellular Networks - A Survey

2021 KSII Transactions on Internet and Information Systems  
Furthermore, we introduce a positioning assisted LTE-LAA system based on the difference in received signal strength (DRSS) to allocate resources among UEs.  ...  Generally speaking, ML techniques are used in IR based on statistical models established for solving specific optimization problems.  ...  Similarly, [71] proposed a CW size adaption based LBT enhancement approach for LTE-LAA UEs, to balance channel access fairness with the QoS.  ... 
doi:10.3837/tiis.2021.07.020 fatcat:uzb3gqtsezcgzehvjige3vgiwq

Machine Learning Based Scheme For Contention Window Size Adaptation In Lte-Laa

Zoraze Ali, Lorenza Giupponi, Josep Mangues-Bafallluy, Biljana Bojovic
2017 Zenodo  
To ensure a fair coexistence of LAA in the unlicensed spectrum with other technologies, e.g., with Wi-Fi, 3GPP has standardized the use of Listen Before Talk (LBT) as the default channel-access scheme  ...  We propose a Neural Network (NN) based scheme that adapts the CW size based on the predicted number of Negative Acknowledgments (NACKs) for all the subframes in a Transmit Opportunity (TXOP) of LAA.  ...  LAA CHANNEL ACCESS PROCEDURE 3GPP analyze different categories of LBT for LAA and finally the most similar to the Carrier Sense Multiple Access with Collision Avoidance mechanism (CSMA/CA) of WiFi was  ... 
doi:10.5281/zenodo.1038024 fatcat:sjcmdbf73jfadj6kkokhu4j4k4

Enhanced Collision Resolution Methods With Mini-Slot Support for 5G NR-U

Vyacheslav Loginov, Aleksandr Troegubov, Andrey Lyakhov, Evgeny Khorov
2021 IEEE Access  
The paper proposes two novel channel access methods for NR-U, in which an NR-U base station randomly stops sending the reservation signal to listen to the channel to detect and resolve collisions.  ...  One of the reasons is the slotted structure of transmissions of cellular base stations in the unlicensed spectrum, which may imply the use of a reservation signal.  ...  Enhanced Distributed Channel Access (EDCA), which is based on Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) [5] .  ... 
doi:10.1109/access.2021.3122953 fatcat:vahrkvkjcje7tjrhisyfbi726i

Listen Before Receive (LBR) Assisted Network Access in LAA and WiFi Heterogeneous Networks

Chin-Ya Huang, Hsueh-Yi Chen, Chen-Hao Huang, Shiann-Tsong Sheu, Te-Wei Chiang, Tzu-Ling Cheng, Chen-Chi Chang
2021 IEEE Access  
The Listen-Before-Talk (LBT) is the main procedure for Licensed Assisted Access (LAA) to accomplish fair and friendly coexistence with other operators or technologies operating over unlicensed spectrum  ...  In order to mitigate the influences caused by HNP and ENP, based on LBT, we firstly analyze HNP and ENP by means of mathematical approach.  ...  Based on LBT, many approaches are proposed to analyze and enhance spectrum efficiency as well as network throughput in the LAA and WiFi coexistent environment [8] , [28] - [34] .  ... 
doi:10.1109/access.2021.3065676 fatcat:4ij6re67ibbk5nk4flew3aadyi
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