Beamforming and Power Allocation Method for Quality of Service Guarantee in High-speed Rail Cars

Abstract

The present invention proposes a beamforming and power allocation method for service quality assurance of high-speed rail carriages. The method first uses the base station to obtain the minimum rate requirement of each carriage fed back by the internal access point of the train, and then judges whether the transmission power provided by the base station can Satisfy the minimum speed requirement of each carriage of the train, and then choose different ways to determine the beam allocation scheme according to the judgment results. After obtaining the beam allocation scheme at each moment, optimize the power allocation to maximize the total mobile service volume of the train. The present invention considers the rate fairness problem of different users at every moment when the train passes through the coverage area of ​​the base station, and under this condition, the total mobile service volume of the train is maximized.

Description

technical field [0001] The invention relates to a high-speed rail wireless communication technology, in particular to a large-scale MIMO beamforming and power distribution method based on location information for high-speed rail compartment service quality assurance, and belongs to the technical field of high-speed rail communication. Background technique [0002] In recent years, with the rapid development of high-speed railways, people have higher and higher requirements for wireless communication quality in high-mobility scenarios. Therefore, providing stable and fast signal transmission services has become the focus of current research on new-generation high-speed railway wireless communication systems. Massive MIMO (Multiple Input Output) technology uses multiple antennas to transmit and receive signals on both the base station side and the receiving end, which can not only improve the quality of communication, but also make full use of space resources; without increasin...

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Problems solved by technology

[0003] After searching the existing technical literature, it was found that Xuhong Chen et al. presented in "2016IEEE 83rd Vehicular Technology Conference (VTC Spring), 15-18 May 2016 (2016 IEEE 83rd Vehicular Technology Conference, May 15-18, 2016 "Published a paper titled "Location-Aided Umbrella-shaped Massive MIMOBeamforming Scheme with Transmit Diversity for High Speed ​​Railway Communications" A method in which Space-Time Block Coding (STBC) and Umbrella-Shaped Beamforming (UBF) are used in combination to reduce the bit error rate of trains traveling in the base station coverage area. However, this paper did not optimize the power allocation; Ximei Liu et al. published a paper entitled "IEEE Access (Volume: 6). Location-Fair Beamforming for High Speed ​​Railway Communication Systems (location-fair beamforming for high-speed railway communication systems)", this paper designed a The transmission scheme based on the fan beam keeps the transmission rate stable when the train passes through the coverage area of ​​the base station. However, this paper considers the overall performance of the train and cannot guarantee that the speed requirements of different carriages at each moment are met; Yang Lu et al published in "IEEE Transactions on Vehicular Technology Volumn:66, Issue:10, Oct.2017, pp:9603-9608 (IEEE Transactions on Vehicular Technology, October 2017, Volume 66, Issue 10, Pages 9603-9608)" Published a paper entitled "Optimal Multiple Coordinated Beamforming for Downlink High-Speed ​​Railway Communications (Optimal Multiple Coordinated Beamforming for Downlink High-Speed ​​Railway Communications)", which studied the multi-cell coordinated beamforming of high-speed railway communications Multicell Coordinated Beamforming (MCBF), under the premise of satisfying the minimum achievable rate of all mobile users outside the train, by optimizing the MCBF vector to maximize the information transmission rate from the serving base station to the high mobility train, its shortcoming is that it does not consider The problem of time fairness; Jiaxun Lu et al. in "2017 23 rd Asia-Pacific Conference on Communications (APCC), 11-12Dec.2017 (the 23rd Asia-Pacific Communication Conference on December 11-12, 2017) published a paper entitled "Differential Service in HSR Communication Systems: Power Allocation and Antenna Selection ( Differentiated services in high-speed rail communication systems: power allocation and antenna selection)", this paper studies the scenario where the transmitter uses distributed antennas and two mobile relays on the train, through joint optimization of dynamic time-domain power allocation and antenna selection Reduce the power consumption of the system, but this article does not consider whether the receiving rate of each relay meets the user's needs

[0004] After searching, it is also found that the Chinese patent with the publication number CN105933045A introduces a large-scale MIMO adaptive beamforming method in high-speed scenarios. Strong correlation of MIMO channels, a beamforming design based on DoA (Direction of Arrival) for large-scale MIMO in high-speed scenarios is proposed. The shortcoming is that it does not consider the service quality guarantee of each car; the Chinese patent with the publication number CN107172630A A millimeter-wave coverage method based on distributed antennas for high-speed rail is introduced. This method proposes a millimeter-wave beam coverage scheme suitable for high-speed rail. By introducing distributed beamforming technology, the switching frequency of communication between trains and ground is reasonably reduced. , but it does not consider the problem of maximizing the receiving rate

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