6G多回程链路选择与功率分配联合优化方法

doi:10.11959/j.issn.2096-3750.2023.00284

摘要/Abstract

摘要：

针对6G系统热点区域基站单回程链路能力受限的问题，提出了弹性覆盖系统多回程链路选择与功率分配联合优化方法，使数据包根据其业务特点和链路状况选择合适的回程链路和功率进行传输。首先，运用排队论分析了数据包在小基站子队列上的传输时延；然后，以最大化时延容忍弹性值为优化目标进行建模；最后，采用匈牙利算法和拉格朗日对偶加梯度下降法进行求解。分析和仿真结果表明，与传统算法相比，所提算法将超可靠低时延通信（URLLC, ultra-reliable and low-latency communication）业务数据包和增强型移动宽带（eMBB, enhanced mobile broadband）业务数据包的平均时延分别降低了17%和14%，有效提高了网络的传输速率。

关键词: 6G基站, 多回程链路, 功率分配, 联合优化, 排队论

Abstract:

Aiming at the problem of limited single backhaul link capability of base stations in hotspot areas of the 6G system, a joint optimization method was proposed for multi-backhaul link selection and power allocation in an elastic coverage system, so that the data packets can select the appropriate backhaul link and transmission power according to their service characteristics and link conditions.Firstly, the transmission delay of data packets on the small cell sub-queue was analyzed by using queuing theory.Then, the optimization objective was modeled with the maximum delay tolerance elasticity value.Finally, the optimization problem were solved by the Hungarian algorithm and the Lagrangian duality and gradient descent method.The simulation results show that, compared with the traditional algorithm, the algorithm proposed reduces the average delay of URLLC (ultra-reliable and low-latency communication) service data packets and eMBB (enhanced mobile broadband) service data packets by 17% and 14% respectively, and effectively improves the network transmission rate.

Key words: 6G base station, multiple backhaul links, power allocation, joint optimization, queuing theory

中图分类号:

TN929.5

李庆洋, 李雪婷, 朱晓荣. 6G多回程链路选择与功率分配联合优化方法[J]. 物联网学报, 2023, 7(2): 67-75.

Qingyang LI, Xueting LI, Xiaorong ZHU. A joint optimization method of multi backhaul link selection and power allocation in 6G[J]. Chinese Journal on Internet of Things, 2023, 7(2): 67-75.

图/表 5

图1

表1

主要仿真参数[20]"

参数描述	数值
白噪声功率谱密度N₀	-174 dBm
SBS卫星回程链路分配带宽B_SB	20 MHz
SBS最大发射功率P_max	33 dBm
MBS覆盖半径R_{a 0}	1 000 m
SBS覆盖半径R_a1	100 m
天线增益G	18 dB
误差范围Δ	0.01
路径损耗系数α_SB	3.76
毫米波回程链路分配带宽B_MMW	1 GHz
卫星回程链路载频 $f_{c}^{SB}$	20 GHz
无线Mesh回程链路载频 $f_{c}^{WMB}$	2.4 GHz
毫米波回程链路载频 $f_{c}^{MMW}$	28 GHz
无线Mesh回程链路分配带宽B_WMB	20 MHz
遮挡因子α₀	1
用户发射功率P_UE	20 dBm

表1

图2

图3

图4

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