Coexistence of Wi-Fi and LTE-LAA Networks: Open Issues

Loginov, Vyacheslav; Lyakhov, Andrey; Khorov, Evgeny

doi:10.1134/s1064226918120148

Cited by 22 publications

(10 citation statements)

References 7 publications

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“…Use of the latter option was considered normal practice in LAA deployments [2]. This approach, however, has been criticized by the IEEE [58] and the research community [6], [5], [59] as it causes a waste of radio resources. Additionally, the use of RS may be disallowed in the future [60].…”

Section: B Channel Accessmentioning

confidence: 99%

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Resolving 5G NR-U Contention for Gap-Based Channel Access in Shared Sub-7 GHz Bands

Zając

Szott

2022

IEEE Access

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Section: B Channel Accessmentioning

confidence: 99%

“…nel with a reservation signal (RS). This is a waste of channel resources and has other disadvantages [6]. The alternative is self-deferral, i.e., having the gNB wait a gap period before transmitting.…”

mentioning

confidence: 99%

Resolving 5G NR-U Contention for Gap-Based Channel Access in Shared Sub-7 GHz Bands

Zając

Szott

2022

IEEE Access

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“…Thus the 3GPP networks have to perform LBT at all frequencies in the band and not merely calculate the whole band's energy. Hence, careful mechanisms that need to be adaptive [44], robust [45], and fair [6] have to be designed for LBT considering the incumbent traffic in these unlicensed band.…”

Section: A Lte-u and Laamentioning

confidence: 99%

Super-MAC: Data Duplication and Combining for Reliability Enhancements in Next-Generation Networks

2021

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A piece of user equipment (UE), typically, has access to multiple radio access technologies (RATS). Moreover, apart from the standard primary cellular network, the secondary cellular networks can assist the primary network in downlink UE communications. In this way, the data can reach the UE through multiple entities. This paper exploits the multiple entities' idea by proposing a cross-layer scheme that combines data to improve the block error rate (BLER) and the throughput. For this, we define a new entity, called the super-MAC, just above the Medium Access Control (MAC) layer. More specifically, we propose data duplication (at the transmitter) and combining (at UE) at the super-MAC, where the super-MAC gets the Radio Link Layer protocol data unit (RLC-PDU) and sends multiple-copies across various interfaces to different MAC-entities. In doing so, the super-MAC attaches a unique sequence number to a group of RLC-PDUs together. At the UE, the data from different MAC entities are combined at super-MAC to clear any block error. The super-MAC operates in between the Cyclic Redundancy Check and Forward Error Correction stages of the HARQ process. The additional complexity introduced by the scheme is negligible in front of the existing operations. Moreover, the average latency improves due to the significant improvement in the Block Error rate (BLER) that the combining scheme offers over the BLER of the conventional standalone system. Also, since the errors significantly reduce, the throughput shows significant improvement. Finally, the proposed scheme is an advancement in HARQ to reduce retransmissions, and hence it is suitable for the next-generation networks like B5G or 6G to adopt the super-MAC.

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“…The most attractive for equipment vendors and mobile operators are the well-studied frequencies of the unlicensed 5 GHz spectrum. In 2016, the 3GPP consortium introduced the License-Assisted Access (LTE-LAA) technology, which allows LTE devices to transmit data in the unlicensed spectrum [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…Since these frequencies are actively used by other technologies, the most common of which is Wi-Fi, LTE-LAA stations are forced to share radio frequency resources with other devices, and the presence of LTE-LAA stations should not lead to a decrease in the performance of other types of devices. For fair and efficient channel sharing, LTE-LAA uses several methods of coexistence with other technologies [2]: Dynamic Frequency Selection (DFS), Transmit Power Control (TPC), listening to the channel before transmission (Listen-Before-Talk, LBT), and others.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Modeling of Joint Operation of Wireless Local Area Networlss and Fifth Generation Cellular Networks

Kutsevol

Loginov

Lyakhov

et al. 2019

Autom Remote Control

Self Cite

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To improve the performance of LTE cellular networks operating in the licensed frequency spectrum, a new LTE-LAA technology has been developed that allows LTE devices to transmit data in unlicensed frequency bands already used by Wi-Fi devices. The channel access method in LTE-LAA networks, as well as in Wi-Fi networks, is based on the mechanism of carrier sense with collision avoidance; however, LTE-LAA transmission can only begin at the boundary of licensed slots. In this work, we develop a mathematical model for the joint operation of LTE-LAA and Wi-Fi networks, which allows to assess the fairness of the distribution of channel resources between LTE-LAA stations and Wi-Fi stations depending on the duration of the licensed slot, the regulation of which will become possible as part of the New Radio technology of fifth generation cellular networks.

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Coexistence of Wi-Fi and LTE-LAA Networks: Open Issues

Cited by 22 publications

References 7 publications

Resolving 5G NR-U Contention for Gap-Based Channel Access in Shared Sub-7 GHz Bands

Resolving 5G NR-U Contention for Gap-Based Channel Access in Shared Sub-7 GHz Bands

Super-MAC: Data Duplication and Combining for Reliability Enhancements in Next-Generation Networks

Mathematical Modeling of Joint Operation of Wireless Local Area Networlss and Fifth Generation Cellular Networks

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