Beamforming and power distributing method for service quality guarantee of high-speed rail cars

Abstract

The invention proposes a beamforming and power distributing method for service quality guarantee of high-speed rail cars. Firstly, a minimum rate requirement of each car fed back by an internal accesspoint of a train is obtained by using a base station; then, it is judged whether the transmission power provided by the base station can meet the minimum rate requirement of each car of the train; afterwards, different manners are selected to determine a beam distribution scheme according to a judgement result; after the beam distribution scheme of each moment is obtained, power distribution is optimized so as to maximize the total mobile service volume of the train. The method in the invention considers the rate fairness problem of different users each moment the train passes through a coverage area of the base station and maximizes the total mobile service volume of the train under the condition.

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...

AI Technical Summary

Problems solved by technology

[0003] After searching the existing technical literature, it was found that XuhongChen et al published a topic in "2016IEEE83rd Vehicular Technology Conference (VTC Spring), 15-18May2016 (2016 IEEE 83rd Vehicular Technology Conference, May 15th to 18th, 2016") It is a paper called "Location-Aided Umbrella-shaped Massive MIMOBeamforming Scheme with Transmit Diversity for High Speed ​​Railway Communications" which proposes a space-time coding (Space-Time Block Coding, STBC) combined with Umbrella-Shaped Beamforming (UBF) is a method used to reduce the bit error rate of the train in the base station coverage area, but this paper does not The power allocation is not optimized; Ximei Liu et al published a paper titled "Location-Fair Beamforming For High Speed ​​Railway Communication Systems (beamforming for high-speed railway communication systems with fair positioning)", this paper designed a fan-beam-based The transmission scheme 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. "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 multi-cell coordinated beamforming for downlink high-speed rail communication)", which studies the multi-cell coordinated beamforming for high-speed rail communication (Mu lticell Coordinated Beamforming, MCBF), under the premise of satisfying the minimum achievable rate of all mobile users outside the train, optimize the MCBF vector to maximize the information transmission rate from the serving base station to the high mobility train, and its shortcoming is that it does not consider time fairness Sexual issues; Jiaxun Lu et al., 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

Images