Improved LTE (long term evolution) scheduling method based on proportional fair

Abstract

The invention discloses an improved LTE (long term evolution) scheduling method based on proportional fair. The method comprises the following steps: calculating the sum of regulating parameters in a scheduling priority factor according to the target speed range of an user I and the average transmission speed at the (n-1)th TTI (transmission time interval) for the user I; calculating the signal to interference and noise ratio of each subcarrier for the user I; calculating the valid signal to noise ratio at each RB (resource block) for the user I; calculating the transmission speed reached by each RB at the nth TTI for the user I according to the valid signal to interference and noise ratio at each RB for the user I; calculating the scheduling priority factor at each RB for the user I; repeating the steps above, finding the scheduling priority factor at each RB in the n TTI for all users I, and distributing each RB to the largest user of the scheduling priority factor, thus the n TTI scheduling is completed; and updating the average transmission speed of all the users according to the scheduling result. According to the invention, the target speed range of each user can be different, thus the method is more suitable for a mixing service system.

Description

technical field [0001] The present invention relates to the technical field of LTE (Long Term Evolution, long-term evolution) scheduling, in particular to a proportional fair-based scheduling method in the system. Background technique [0002] LTE is a super-3G broadband wireless access technology launched by 3GPP. Scheduling is an indispensable part of LTE to achieve high data capacity and fast transmission rate. Its main task is to reasonably allocate wireless resources for various packet services of wireless users, and effectively improve mobile channel utilization on the premise of ensuring user fairness. Rate and service quality of service (QoS). In the communication process, multiple users share limited bandwidth resources, how to meet the minimum rate requirements of users, and whether to allocate resources fairly under the condition of multi-service mixing become important issues to be considered in scheduling. [0003] At present, the more commonly used scheduling...

AI Technical Summary

Problems solved by technology

This patent can guarantee the fairness of multi-user scheduling in the closed-loop MIMO system when the channel status of each user is significantly different, but it cannot meet the user's minimum rate request and does not take into account the fairness of high-speed and low-speed services

[0004] In addition, the improvement method of proportional fair scheduling algorithm proposed in many papers, such as Pengpeng Song and Liyu Cai in the article "Multi-user subcarrier allocation with minimum rate requests for downlink OFDM packet transmission" Vehicular Technology Conference, 2004. VTC 2004-Spring. The PF scheduling priority factor in 2004 IEEE 59fh can meet the user's minimum rate requirements while maximizing system fairness and efficiency, but it is not suitable for mixed services, and cannot guarantee the fairness of the system under mixed services

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