Power Allocation Algorithm in T2T and T2G Hybrid Network
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摘要:
现有功率分配算法大多基于理想信道状态信息(CSI)实现性能优化，在列车对列车(T2T)双移动端通信场景中并不适用. 针对城市轨道交通系统T2T和车地(T2G)混合网络场景，引入CSI反馈延时，研究非理想状态时仍可保障通信质量的功率分配算法. 考虑单蜂窝用户复用单T2T用户对情况，以T2G用户传输速率总和最大化为优化目标，构建多约束条件下的功率分配模型. 首先，根据分步思想将非凸模型简化为最优分配功率计算和最佳复用用户匹配2个子模型；其次，利用线性规划分析可行域内目标函数的最优解及最优值，并通过二分法求解最优分配功率；最后，筛选出可行复用对集合后，利用匈牙利算法进行二分图匹配. 仿真结果表明：该算法兼顾城市轨道交通系统中T2T通信中断概率约束和T2G用户传输速率，且可实现1.0 ms内的CSI反馈延时.
Abstract:Most of power allocation algorithms are based on ideal channel state information (CSI) to achieve performance optimization, which is not applicable in train-to-train (T2T) dual mobile terminal communication. For the hybrid network scenario of T2T and train-to-ground (T2G) in urban rail transit system, the CSI feedback delay is introduced to study the power allocation algorithm that can still guarantee the communication quality under non-ideal conditions. Given the situation that a single T2G user reuse a single T2T user pair, the optimization goal is to maximize the total transmission rate of T2G users, and a power allocation model is constructed under multiple constraints. First, according to a step-by-step concept, the non-convex model is divided into two sub-models of optimal allocated power calculation and optimal multiplexing users matching. Second, the optimal solution and the optimal value of the objective function in the feasible region are analyzed through linear programming, and the optimal distribution power is solved by the dichotomy. Finally, after screening the set of feasible multiplex pairs, the Hungarian algorithm is used for matching. Simulation results show that the proposed algorithm allows for the interruption probability constraint of T2T communication and the total transmission rate of T2G users in the urban rail transit system, and controls CSI feedback delay within 1.0 ms.
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图 2 城市轨道交通系统T2T和T2G混合网络模型
Figure 2. T2T and T2G hybrid network model for urban rail transit system
图 6 不同反馈延时下T2T用户信干噪比的累积分布函数
Figure 6. CDF of SINR for T2T users in different feedback delays
图 7 不同中断概率下T2T用户信干噪比的累积分布函数
Figure 7. CDF of SINR for T2T users under different outage probabilities
表 1 仿真参数设置
Table 1. Simulation parameter setting
仿真参数 数值 Bf/MHz 10 fc/GHz 2 GB/dBi 8 GT/dBi 3 Pc,max/dBm 23 Pt,max/dBm 23 ε 10−6 $ {\gamma _0} $/dB 5 r0/(bps·Hz−1) 0.5 N0/dBm −114 $ {\xi _{{\text{T2T}}}} $/dB 3 $ {\xi _{{\text{T2G}}}} $/dB 8 
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