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In order to achieve low-latency and low-energy offshore communication, the dynamic service cache update mechanism is introduced into the complex neural network, and the mobile edge dynamic service caching policy (MEDSCP ) based on double deep Q network (DDQN ) is proposed by cleverly designing the complex neural network structure based on offshore communication scenarios. The policy firstly obtains the optimal offloading decision set through the user terminal task offloading decision game, and then utilizes mobile edge computing(MEC) and dynamic service caching update to reduce the delay and energy cost of task execution in the offshore communication environment, aiming to improve the efficiency of task processing in offshore communication and to expand the development potential of this industry. Simulation experimental results show that the proposed MEDSCP strategy can achieve fast convergence of the algorithm while guaranteeing the training effect,and also effectively reduce the delay-energy weighted sum of offshore communications compared with existing work.
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为了实现低时延低能耗的近海通信,将动态服务缓存更新机制引入复杂神经网络当中,基于近海通信场景对复杂的神经网络结构进行巧妙设计,提出了基于双重深度Q网络(Double Deep Q Network,DDQN)的移动边缘动态服务缓存策略(Mobile Edge Dynamic Service Caching Policy,MEDSCP)。该策略先通过用户终端任务卸载决策博弈得到最佳卸载决策集,然后利用移动边缘计算(Mobile Edge Computing,MEC)和动态服务缓存更新来减少近海通信环境下任务执行的时延能耗成本,旨在提高近海通信的任务处理效率并扩展该行业的发展潜力。仿真实验结果表明,所提的MEDSCP策略与现有工作相比,能在保证训练效果的前提下实现算法的快速收敛,还能有效降低近海通信的时延能耗加权和。
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庄颖瑜 女,2000年生于广西钦州,2022年获学士学位,现为硕士研究生,主要研究方向为海洋信息环境感知、空天海地一体化、动态资源管理等。
潘春雨 女,1989年生于河南新野,2019年获博士学位,现为副教授,主要研究方向为基于人工智能的移动通信网络、计算与资源管理技术、无人机通信技术等。
李学华 女,1977年生于湖北荆州,2008年获博士学位,现为教授,主要研究方向为无线通信关键技术、物联网技术、智能边缘技术等。
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庄颖瑜 女,2000年生于广西钦州,2022年获学士学位,现为硕士研究生,主要研究方向为海洋信息环境感知、空天海地一体化、动态资源管理等。
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潘春雨 女,1989年生于河南新野,2019年获博士学位,现为副教授,主要研究方向为基于人工智能的移动通信网络、计算与资源管理技术、无人机通信技术等。
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潘春雨 女,1989年生于河南新野,2019年获博士学位,现为副教授,主要研究方向为基于人工智能的移动通信网络、计算与资源管理技术、无人机通信技术等。
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李学华 女,1977年生于湖北荆州,2008年获博士学位,现为教授,主要研究方向为无线通信关键技术、物联网技术、智能边缘技术等。
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李学华 女,1977年生于湖北荆州,2008年获博士学位,现为教授,主要研究方向为无线通信关键技术、物联网技术、智能边缘技术等。
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环境参数δ对计算任务分布的影响, figureFileSmall=37/RkenpmAtIPMA4OWOt9g==, figureFileBig=ejdkdnsw+QYIyXvOxAIzRQ==, tableContent=null), ArticleFig(id=1251226715733836250, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226683957789058, language=EN, label=null, caption=null, figureFileSmall=fLk/dli/sLOHRVqwLG0B5w==, figureFileBig=VnczEgWMCIFfBy3MdTbVmg==, tableContent=null), ArticleFig(id=1251226715830305243, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226683957789058, language=CN, label=图3, caption=
用户终端任务卸载决策流程, figureFileSmall=fLk/dli/sLOHRVqwLG0B5w==, figureFileBig=VnczEgWMCIFfBy3MdTbVmg==, tableContent=null), ArticleFig(id=1251226715930968541, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226683957789058, language=EN, label=null, caption=null, figureFileSmall=3SokUCaqiDJ2duR/b/ybbA==, figureFileBig=1onaH8ks4wIkeDR5qJGKZg==, tableContent=null), ArticleFig(id=1251226716006466015, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226683957789058, language=CN, label=图4, caption=
MEDSCP神经网络结构, figureFileSmall=3SokUCaqiDJ2duR/b/ybbA==, figureFileBig=1onaH8ks4wIkeDR5qJGKZg==, tableContent=null), ArticleFig(id=1251226717562552802, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226683957789058, language=EN, label=null, caption=null, figureFileSmall=TEANPlHV9u0Z3IhPQw4nRw==, figureFileBig=MjU7HbvtypuuQrazEeiH2Q==, tableContent=null), ArticleFig(id=1251226717667410404, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226683957789058, language=CN, label=图5, caption=
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MEDSCP与已有文献方案对比, figureFileSmall=MGG3dZn1CVBPCgBZMMHcIw==, figureFileBig=L0FCxQ6qtDW4oVlikDJdsQ==, tableContent=null), ArticleFig(id=1251226717872931307, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226683957789058, language=EN, label=null, caption=null, figureFileSmall=ohztIk+qFr1vrbF6Uaq65g==, figureFileBig=hdCQOP/L3DmVOt+PJZ0IDQ==, tableContent=null), ArticleFig(id=1251226717935845870, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226683957789058, language=CN, label=图7, caption=
不同有缓存的卸载策略平均每时隙时延能耗加权和对比, figureFileSmall=ohztIk+qFr1vrbF6Uaq65g==, figureFileBig=hdCQOP/L3DmVOt+PJZ0IDQ==, tableContent=null), ArticleFig(id=1251226717994566129, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226683957789058, language=EN, label=null, caption=null, figureFileSmall=COOgeoDBZPdMpglfAXgLeA==, figureFileBig=92jBU5EQoP6pAvulsgGjJw==, tableContent=null), ArticleFig(id=1251226718074257908, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226683957789058, language=CN, label=图8, caption=
不同策略下MEC服务器缓存容量与平均每时隙时延能耗加权和的关系, figureFileSmall=COOgeoDBZPdMpglfAXgLeA==, figureFileBig=92jBU5EQoP6pAvulsgGjJw==, tableContent=null), ArticleFig(id=1251226718128783863, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226683957789058, language=EN, label=null, caption=null, figureFileSmall=mFVtc1cNH5EjdfnZGp2sGg==, figureFileBig=/6aoy2uWQ+14n9gbApiEKA==, tableContent=null), ArticleFig(id=1251226718200087033, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226683957789058, language=CN, label=图9, caption=
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| 计算模式 | 适用情况 | 时延T | 能耗E | 成本Z |
|---|
| 本地计算Local | 适用于用户设备通过无线传输干扰严重的情形 |  |  |  |
| 有缓存的计算卸载Offloading | 适用于用户设备选择通过计算卸载来执行任务,且MEC服务器缓存有该任务类型的VNF的情形 |  |  |  |
| 无缓存的计算卸载No-Offloading | 适用于用户设备选择通过计算卸载来执行任务,但MEC服务器没有缓存该任务类型的VNF的情形 |  |  |  |
), ArticleFig(id=1251226718560797184, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226683957789058, language=CN, label=表1, caption=
计算模型时延能耗对比
, figureFileSmall=null, figureFileBig=null, tableContent=
| 计算模式 | 适用情况 | 时延T | 能耗E | 成本Z |
|---|
| 本地计算Local | 适用于用户设备通过无线传输干扰严重的情形 |  |  |  |
| 有缓存的计算卸载Offloading | 适用于用户设备选择通过计算卸载来执行任务,且MEC服务器缓存有该任务类型的VNF的情形 |  |  |  |
| 无缓存的计算卸载No-Offloading | 适用于用户设备选择通过计算卸载来执行任务,但MEC服务器没有缓存该任务类型的VNF的情形 |  |  |  |
), ArticleFig(id=1251226718632100353, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226683957789058, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 任务卸载策略 | 描述 |
|---|
| 无缓存的卸载No-offloading | 利用本文提出的基于博弈的多用户实时卸载策略来决定在MEC服务器的无VNF缓存状态下,终端任务的执行策略 |
| 有缓存的卸载 | MEDSCP | 利用本文提出的移动边缘动态服务缓存策略得到MEC服务器的最佳服务缓存策略 |
| MFU-MEC | MEC服务器根据过去时隙的请求信息计算出最高请求次数的VNF进行缓存,当缓存存储已满时,已缓存VNF中被使用次数最少的将被新的VNF替换 |
| FIFO-MEC | 基于先进先出的MEC缓存策略,当MEC服务器缓存空间不足时,先缓存的VNF将优先被替换 |
), ArticleFig(id=1251226718699209219, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226683957789058, language=CN, label=表2, caption=
缓存策略对比
, figureFileSmall=null, figureFileBig=null, tableContent=
| 任务卸载策略 | 描述 |
|---|
| 无缓存的卸载No-offloading | 利用本文提出的基于博弈的多用户实时卸载策略来决定在MEC服务器的无VNF缓存状态下,终端任务的执行策略 |
| 有缓存的卸载 | MEDSCP | 利用本文提出的移动边缘动态服务缓存策略得到MEC服务器的最佳服务缓存策略 |
| MFU-MEC | MEC服务器根据过去时隙的请求信息计算出最高请求次数的VNF进行缓存,当缓存存储已满时,已缓存VNF中被使用次数最少的将被新的VNF替换 |
| FIFO-MEC | 基于先进先出的MEC缓存策略,当MEC服务器缓存空间不足时,先缓存的VNF将优先被替换 |
), ArticleFig(id=1251226718774706693, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226683957789058, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 含义 | 取值 | 单位 |
|---|
| K | 近海终端数量 | 10 | 台 |
| W | 任务类型数量 | 50 | 种 |
| pk | 近海通信设备传输功率 | 500 | mW |
| fk | 近海终端k计算能力 | 1 | 标准任务块/时隙 |
| fC | MEC服务器计算能力 | 20 | 标准任务块/时隙 |
| D | 计算任务数据大小 | 100~500 | 标准任务块 |
| V | VNF数据大小 | 1000~5000 | 标准任务块 |
| φ | 时延权重 | 0.5 | 无单位 |
| θ | 能耗权重 | 0.5 | 无单位 |
| δ | 环境参数 | 0.7 | 无单位 |
), ArticleFig(id=1251226718858592775, tenantId=1146029695717560320, journalId=1251194772300279900, articleId=1251226683957789058, language=CN, label=表3, caption=
仿真参数设置
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| 参数 | 含义 | 取值 | 单位 |
|---|
| K | 近海终端数量 | 10 | 台 |
| W | 任务类型数量 | 50 | 种 |
| pk | 近海通信设备传输功率 | 500 | mW |
| fk | 近海终端k计算能力 | 1 | 标准任务块/时隙 |
| fC | MEC服务器计算能力 | 20 | 标准任务块/时隙 |
| D | 计算任务数据大小 | 100~500 | 标准任务块 |
| V | VNF数据大小 | 1000~5000 | 标准任务块 |
| φ | 时延权重 | 0.5 | 无单位 |
| θ | 能耗权重 | 0.5 | 无单位 |
| δ | 环境参数 | 0.7 | 无单位 |
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