Downlink Interference Control of LAA-LTE for Coexistence With Asymmetric Hidden Wi-Fi APs

To confront the increasing mobile traffic demand and the scarcity of the licensed band, 3GPP has standardized a new type of LTE, called License Assisted Access (LAA) LTE (LAA-LTE), which aggregates licensed bands with unlicensed bands. Since the conventional Wi-Fi devices employ −62 dBm clear channel assessment threshold to LAA-LTE's signals, the appearance of LAA-LTE in the unlicensed band leads to a new phenomenon, asymmetric hidden terminal problem, which severely degrades the throughput and delay performance of LAA-LTE as well as Wi-Fi. We propose a downlink interference control scheme for an LAA-LTE eNB to prevent the asymmetric hidden Wi-Fi APs nearby from recklessly transmitting and thereby interfering the eNB's transmission. Specifically, we analyze the distortion of Wi-Fi's signals received at LAA-LTE and LAA-LTE's signals received at Wi-Fi due to the difference of physical-layer parameters between LAA-LTE and Wi-Fi. Based on this analysis, we develop an AP suppression and power control technique to control incoming and outgoing interference of the LAA-LTE eNB. Extensive simulations confirm that the proposed scheme improves the throughput and delay performance of LAA-LTE while maintaining or even improving the performance of Wi-Fi.

[1]  Norman C. Beaulieu,et al.  Distributed Resource Allocation in SDCN-Based Heterogeneous Networks Utilizing Licensed and Unlicensed Bands , 2018, IEEE Transactions on Wireless Communications.

[2]  M. S. Alam,et al.  Downlink SNR to CQI Mapping for Different Multiple Antenna Techniques in LTE , 2012 .

[3]  Walid Saad,et al.  Echo State Networks for Self-Organizing Resource Allocation in LTE-U With Uplink–Downlink Decoupling , 2016, IEEE Transactions on Wireless Communications.

[4]  Jihoon Kim,et al.  COTA: Channel occupancy time adaptation for LTE in unlicensed spectrum , 2017, 2017 IEEE International Symposium on Dynamic Spectrum Access Networks (DySPAN).

[5]  Jin Yang,et al.  Evolved Universal Terrestrial Radio Access Network (EUTRAN) , 2017 .

[6]  Mahesh K. Marina,et al.  Holistic Small Cell Traffic Balancing across Licensed and Unlicensed Bands , 2016, MSWiM.

[7]  Ignas G. Niemegeers,et al.  Fairness in Wireless Networks:Issues, Measures and Challenges , 2014, IEEE Communications Surveys & Tutorials.

[8]  Morteza Mehrnoush,et al.  Analytical Modeling of Wi-Fi and LTE-LAA Coexistence: Throughput and Impact of Energy Detection Threshold , 2018, IEEE/ACM Transactions on Networking.

[9]  Jeffrey H. Reed,et al.  Extending LTE into the Unlicensed Spectrum: Technical Analysis of the Proposed Variants , 2017, IEEE Communications Standards Magazine.

[10]  Yue Wang,et al.  A Stochastic Optimization Framework for Adaptive Spectrum Access and Power Allocation in Licensed-Assisted Access Networks , 2017, IEEE Access.

[11]  S. Kinjo.  Time domain channel estimation schemes for OFDM systems with multiple antenna transmissions , 2009, 2009 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS).

[12]  M. U. A. C. T. Echniques,et al.  LTE in a Nutshell : The Physical Layer , .

[13]  Raj Jain,et al.  A Quantitative Measure Of Fairness And Discrimination For Resource Allocation In Shared Computer Systems , 1998, ArXiv.

[14]  Qixun Zhang,et al.  Design and Performance Analysis of a Fairness-Based License-Assisted Access and Resource Scheduling Scheme , 2016, IEEE Journal on Selected Areas in Communications.

[15]  Monisha Ghosh,et al.  Impact of changing energy detection thresholds on fair coexistence of Wi-Fi and LTE in the unlicensed spectrum , 2017, 2017 Wireless Telecommunications Symposium (WTS).

[16]  Harmonized European,et al.  Broadband Radio Access Networks ( BRAN ) ; 5 GHz high performance RLAN , 2022 .

[17]  Zhi-Quan Luo,et al.  Semidefinite Relaxation of Quadratic Optimization Problems , 2010, IEEE Signal Processing Magazine.

[18]  Hyun Jong Yang,et al.  Performance Analysis of License Assisted Access LTE with Asymmetric Hidden Terminals , 2016, IEEE Transactions on Mobile Computing.

[19]  Yoshitaka Hara,et al.  Performance of channel estimation schemes for multicarrier systems , 2006 .

[20]  Yue Wang,et al.  Energy-Aware Adaptive Spectrum Access and Power Allocation in LAA Networks via Lyapunov Optimization , 2017, 2017 IEEE 85th Vehicular Technology Conference (VTC Spring).

[21]  Stephen P. Boyd,et al.  Semidefinite Programming , 1996, SIAM Rev..

[22]  Shahid Mumtaz,et al.  Joint User Association and Power Allocation for Licensed and Unlicensed Spectrum in 5G Networks , 2017, GLOBECOM 2017 - 2017 IEEE Global Communications Conference.

[23]  Elza Erkip,et al.  Small-Cell Traffic Balancing Over Licensed and Unlicensed Bands , 2014, IEEE Transactions on Vehicular Technology.

[24]  Lin X. Cai,et al.  Proportional Fairness-Based Resource Allocation for LTE-U Coexisting With Wi-Fi , 2017, IEEE Access.

[25]  Brahim Bensaou,et al.  Performance analysis of IEEE 802.11e contention-based channel access , 2004, IEEE Journal on Selected Areas in Communications.

[26]  Xu Yuan,et al.  Coexistence Between Wi-Fi and LTE on Unlicensed Spectrum: A Human-Centric Approach , 2017, IEEE Journal on Selected Areas in Communications.

[27]  V. Bhargava,et al.  An investigation into time-domain approach for OFDM channel estimation , 2000, IEEE Trans. Broadcast..

[28]  Zhi Ding,et al.  Optimizing Unlicensed Spectrum Sharing for LTE-U and WiFi Network Coexistence , 2016, IEEE Journal on Selected Areas in Communications.