Cooperative LBT Design and Effective Capacity Analysis for 5G NR Ultra Dense Networks in Unlicensed Spectrum
With the rapidly increasing demand of data traffic in fifth-generation (5G) wireless systems, various sophisticated techniques have been developed to cope with the demand. New radio-unlicensed (NR-U) technology is one of the most promising techniques to address the exponential growth of data traffic...
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| Format: | Article |
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IEEE
2019-01-01
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| Series: | IEEE Access |
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| Online Access: | https://ieeexplore.ieee.org/document/8688405/ |
| _version_ | 1818914500191977472 |
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| author | Hengguo Song Qimei Cui Yu Gu Gordon L. Stuber Yong Li Zesong Fei Chongtao Guo |
| author_facet | Hengguo Song Qimei Cui Yu Gu Gordon L. Stuber Yong Li Zesong Fei Chongtao Guo |
| author_sort | Hengguo Song |
| collection | DOAJ |
| description | With the rapidly increasing demand of data traffic in fifth-generation (5G) wireless systems, various sophisticated techniques have been developed to cope with the demand. New radio-unlicensed (NR-U) technology is one of the most promising techniques to address the exponential growth of data traffic. At the same time, NR base stations are densely deployed in 5G. Therefore, large numbers of NR-U base stations attempt to access the unlicensed spectrum. Although listen before talk (LBT) with random backoff can guarantee fairness, it can also increase the collision probability. For the IEEE 802.11 Wi-Fi networks, a contention-based random access protocol is adopted, which cannot guarantee the Quality of Service (QoS). To overcome these problems, a new LBT protocol, referred to as cooperative LBT, is designed, in which zero forcing (ZF) precoding is applied to suppress the multi-user interference. Based on the new LBT protocol, a (N+3)-state semi-Markovian model is established to characterize the effective capacity of NR-U in unlicensed bands, where N is the number of NR-U base stations. An expression for the effective capacity is obtained, which is a function of QoS, instantaneous transmit rate, the number of Wi-Fi nodes, and NR-U base stations. The influences of the finite backhaul and transmit power on the effective capacity are also analyzed in this paper. The simulation results show that the usage of cooperative communication can reduce the collision probabilities from 0.4928 to 0.1632 and increase the effective capacities by 220.04%. The cooperative LBT protocol has a more compelling advantage for 5G NR ultradense deployment scenarios. |
| first_indexed | 2024-12-19T23:47:22Z |
| format | Article |
| id | doaj.art-2ceea5fed4ab436daec5291863b180a9 |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-12-19T23:47:22Z |
| publishDate | 2019-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-2ceea5fed4ab436daec5291863b180a92022-12-21T20:01:16ZengIEEEIEEE Access2169-35362019-01-017502655027910.1109/ACCESS.2019.29105828688405Cooperative LBT Design and Effective Capacity Analysis for 5G NR Ultra Dense Networks in Unlicensed SpectrumHengguo Song0https://orcid.org/0000-0002-8903-0139Qimei Cui1Yu Gu2https://orcid.org/0000-0003-0135-2326Gordon L. Stuber3Yong Li4https://orcid.org/0000-0001-5617-1659Zesong Fei5https://orcid.org/0000-0002-7576-625XChongtao Guo6https://orcid.org/0000-0002-0701-9615National Engineering Laboratory for Mobile Network Technologies, Beijing University of Posts and Telecommunications, Beijing, ChinaNational Engineering Laboratory for Mobile Network Technologies, Beijing University of Posts and Telecommunications, Beijing, ChinaNational Engineering Laboratory for Mobile Network Technologies, Beijing University of Posts and Telecommunications, Beijing, ChinaSchool of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA, USADepartment of Electronic Engineering, Tsinghua University, Beijing, ChinaSchool of Information and Electronics, Beijing Institute of Technology, Beijing, ChinaGuangdong Key Laboratory of Intelligent Information Processing, College of Information Engineering, Shenzhen University, Shenzhen, ChinaWith the rapidly increasing demand of data traffic in fifth-generation (5G) wireless systems, various sophisticated techniques have been developed to cope with the demand. New radio-unlicensed (NR-U) technology is one of the most promising techniques to address the exponential growth of data traffic. At the same time, NR base stations are densely deployed in 5G. Therefore, large numbers of NR-U base stations attempt to access the unlicensed spectrum. Although listen before talk (LBT) with random backoff can guarantee fairness, it can also increase the collision probability. For the IEEE 802.11 Wi-Fi networks, a contention-based random access protocol is adopted, which cannot guarantee the Quality of Service (QoS). To overcome these problems, a new LBT protocol, referred to as cooperative LBT, is designed, in which zero forcing (ZF) precoding is applied to suppress the multi-user interference. Based on the new LBT protocol, a (N+3)-state semi-Markovian model is established to characterize the effective capacity of NR-U in unlicensed bands, where N is the number of NR-U base stations. An expression for the effective capacity is obtained, which is a function of QoS, instantaneous transmit rate, the number of Wi-Fi nodes, and NR-U base stations. The influences of the finite backhaul and transmit power on the effective capacity are also analyzed in this paper. The simulation results show that the usage of cooperative communication can reduce the collision probabilities from 0.4928 to 0.1632 and increase the effective capacities by 220.04%. The cooperative LBT protocol has a more compelling advantage for 5G NR ultradense deployment scenarios.https://ieeexplore.ieee.org/document/8688405/Effective capacitynew radio-unlicensed (NR-U)cooperative networkquality of service (QoS)listen before talk (LBT) |
| spellingShingle | Hengguo Song Qimei Cui Yu Gu Gordon L. Stuber Yong Li Zesong Fei Chongtao Guo Cooperative LBT Design and Effective Capacity Analysis for 5G NR Ultra Dense Networks in Unlicensed Spectrum IEEE Access Effective capacity new radio-unlicensed (NR-U) cooperative network quality of service (QoS) listen before talk (LBT) |
| title | Cooperative LBT Design and Effective Capacity Analysis for 5G NR Ultra Dense Networks in Unlicensed Spectrum |
| title_full | Cooperative LBT Design and Effective Capacity Analysis for 5G NR Ultra Dense Networks in Unlicensed Spectrum |
| title_fullStr | Cooperative LBT Design and Effective Capacity Analysis for 5G NR Ultra Dense Networks in Unlicensed Spectrum |
| title_full_unstemmed | Cooperative LBT Design and Effective Capacity Analysis for 5G NR Ultra Dense Networks in Unlicensed Spectrum |
| title_short | Cooperative LBT Design and Effective Capacity Analysis for 5G NR Ultra Dense Networks in Unlicensed Spectrum |
| title_sort | cooperative lbt design and effective capacity analysis for 5g nr ultra dense networks in unlicensed spectrum |
| topic | Effective capacity new radio-unlicensed (NR-U) cooperative network quality of service (QoS) listen before talk (LBT) |
| url | https://ieeexplore.ieee.org/document/8688405/ |
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