高能效频谱共享协作通信机制研究
发布时间：2019-06-27 14:58
【摘要】：无线通信业务需求的持续增长,使得无线资源变得十分稀缺的同时产业能耗也越来越大。协作频谱共享技术可以在不改变现有频谱分配总体结构下,采用灵活的频谱接入技术,通过授权系统和非授权系统之间无线资源的共享和管理来提高频谱的利用率和通信系统的能效。协作频谱共享可分为underlay(共存)和overlay(覆盖)两种方式。在共存的共享方式下,只要非授权系统对授权系统的干扰低于授权系统可容忍的干扰限制,非授权系统就可与授权系统同时共享授权频带。由于授权用户无需知道非授权用户的存在,不会给授权用户带来额外的开销；但是,授权系统的干扰限制是一个上限值,因此非授权系统为了避免对授权系统的干扰将采用相对较小的功率来传输；即使在授权频谱完全空闲的情况下,非授权系统也不会用高的功率来传输数据,这会影响通信系统的频谱和功率效率。对于覆盖式共享,在满足授权系统通信需求的前提下,提供空闲频谱给非授权系统使用,授权系统和非授权系统并不同时占用信道。非授权系统机会式的接入频谱会带来信道反馈和信令等额外开销,但是非授权系统的传输功率不会受到干扰的限制,因此有可能提高系统的能效。本文将侧重于覆盖式高能效协作频谱共享通信机制的研究,主要创新点如下： 1.本文分析了单传输时间间隔(TTI)调度的协作频谱共享方式下资源分配问题。单TTI调度的频谱共享方式是指,一个TTI内通信系统中各链路的信道状态保持不变,非授权次级系统在一个TTI内协作授权主系统的传输,要求在该TTI内立即获得一定的传输时间作为回报。因此,主系统和次级系统的协作共享仅依赖于一个TTI内各链路的信道状态。本文分析了在保证授权系统和非授权系统服务质量的同时,最小化频谱共享协作通信系统能耗的无线资源分配问题,通过凸优化理论得到了最优的时间和功率分配的封闭形式的解。进一步,本文分析了不同协作方式下协作频谱共享通信系统的能效性能。 2.本文提出了多TTIs调度的频谱共享机制,并且考虑了接入切换代价对协作频谱通信系统性能的影响。多TTIs调度的频谱共享方式是指,多个TTIs间通信系统中各链路的信道状态是变化的,次级系统根据信道的状态自适应地选择在不同的TTIs进行中继或接入。因此,多TTIs调度能有效地利用信道衰落的时间分集增益大大提高频谱共享通信系统的性能。本文分析了在多TTIs调度的频谱共享方式下,在授权系统和非授权系统的能量限制和授权系统服务质量的限制下,最大化协作频谱共享通信系统吞吐量的问题；并将其转化为受限的马尔科夫决策问题,利用拉格朗日方法和Q-学习算法得到了最优的频谱接入策略。但是,该算法的计算复杂度将随着通信系统中链路数的增加呈指数激增。 3.为了解决马尔科夫决策算法计算复杂度的问题,本文建立了基于劳动-消费模型的多TTIs调度的协作共享机制。在该模型中,在保证授权系统性能的前提下,非授权系统中的次级用户(“劳动者”)通过中继(“劳动”)授权系统中主用户的信息来获得可在系统中传输的功率和时间(资源)用于自己信息的传输(“消费”)；而信道的状态可视为“市场环境”,劳动者可以根据所拥有的资源和市场环境来决定劳动还是消费。在该模型下次级用户可以根据信道状态自适应地选择中继和接入的时机,提高共享通信系统的性能。进一步,本文分析了多用户协作的多TTIs调度的频谱共享机制,讨论了次级用户接入等待时延对系统性能和用户接入数量的影响。
[Abstract]:The continuous growth of the demand for wireless communication services makes wireless resources become scarce and the industry's energy consumption is growing. The cooperative spectrum sharing technology can improve the utilization rate of the frequency spectrum and the energy efficiency of the communication system by adopting a flexible spectrum access technology without changing the overall structure of the existing frequency spectrum allocation, and by the sharing and management of the wireless resources between the authorization system and the non-authorization system. The collaboration frequency spectrum sharing can be divided into two ways: an underlay (co-existence) and an overlay (overlay). In the coexistence sharing mode, the non-authorization system can share the authorization frequency band with the authorization system at the same time as long as the interference of the unauthorized system to the authorization system is lower than the tolerable interference limit of the authorization system. since the authorized user does not need to know the presence of the non-authorized user, no additional overhead is brought to the authorized user; however, the interference limit of the authorization system is an upper limit value, and therefore the non-authorization system will adopt a relatively small power to transmit in order to avoid the interference to the authorization system; Even in the case where the authorized spectrum is completely idle, the non-authorization system will not transmit data with high power, which may affect the spectrum and power efficiency of the communication system. For overlay sharing, on the premise of meeting the communication requirement of the authorization system, the idle spectrum is provided to the non-authorization system, and the authorization system and the non-authorization system do not occupy the channel at the same time. The access spectrum of the non-authorization system opportunistic type results in additional overhead such as channel feedback and signaling, but the transmission power of the non-authorization system is not limited by the interference, and therefore it is possible to improve the energy efficiency of the system. This paper will focus on the research of the coverage-type energy-efficient cooperative spectrum sharing communication mechanism. The main innovation points are as follows: 1. In this paper, the resource allocation in the cooperative spectrum sharing mode of single transmission time interval (TTI) scheduling is analyzed. the frequency spectrum sharing mode of the single TTI scheduling is that the channel state of each link in the communication system in one TTI is kept unchanged, and the non-authorization secondary system is in cooperation with the transmission of the main system in one TTI, and a certain transmission time is required to be taken as the back-back in the TTI the co-sharing of the primary system and the secondary system is therefore dependent only on the channel shape of the links within one tti, In this paper, the wireless resource allocation problem of the energy consumption of the spectrum sharing cooperative communication system is minimized while the service quality of the authorization system and the non-authorization system are guaranteed, and the optimal time and power distribution closed form is obtained by the convex optimization theory. In this paper, the energy efficiency of the cooperative spectrum sharing and communication system is analyzed in this paper. 2. The spectrum sharing mechanism of multi-TIs scheduling is proposed in this paper, and the performance of the cooperative spectrum communication system is considered in consideration of the cost of the access handover. The spectrum sharing mode of the multi-TIs scheduling means that the channel state of each link in the multiple TIs communication system is changed, and the secondary system adaptively selects to relay the different TIs according to the state of the channel. and therefore, the multi-TIs scheduling can effectively utilize the time diversity gain of the channel fading to greatly improve the spectrum sharing communication system, The paper analyzes the problem of maximizing the throughput of the cooperative spectrum sharing communication system under the limitation of the energy limit of the authorization system and the non-authorization system and the service quality of the authorization system in the frequency spectrum sharing mode of the multi-TIs scheduling, and converts it into a limited Markov decision. The optimal spectral joint is obtained by the Lagrange method and the Q-learning algorithm. a policy is entered. However, the computational complexity of the algorithm will refer to the increase in the number of links in the communication system 3. In order to solve the problem of the computational complexity of the Markov decision algorithm, the association of multi-TIs scheduling based on the labor-consumption model is established in this paper. As a sharing mechanism, in this model, the system of authorization is guaranteed. On the premise that the secondary user ("a worker") in the non-authorization system obtains the transmission ("consumption") of the power and time (resources) that can be transmitted in the system for the own information through the information of the main user in the relay ("labor") authorization system, and the state of the channel can be considered as a "trunk>" market entry "< / trunk>, the worker can decide on the basis of the resources and the market environment And the next user of the model can adaptively select the timing of the relay and the access according to the channel state so as to improve the sharing communication. The performance of the system is further analyzed. The spectrum sharing mechanism of multi-user cooperative multi-TIs scheduling is analyzed, and the system performance and user access are discussed.
【学位授予单位】：北京邮电大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TN92
本文编号：2506895
[Abstract]:The continuous growth of the demand for wireless communication services makes wireless resources become scarce and the industry's energy consumption is growing. The cooperative spectrum sharing technology can improve the utilization rate of the frequency spectrum and the energy efficiency of the communication system by adopting a flexible spectrum access technology without changing the overall structure of the existing frequency spectrum allocation, and by the sharing and management of the wireless resources between the authorization system and the non-authorization system. The collaboration frequency spectrum sharing can be divided into two ways: an underlay (co-existence) and an overlay (overlay). In the coexistence sharing mode, the non-authorization system can share the authorization frequency band with the authorization system at the same time as long as the interference of the unauthorized system to the authorization system is lower than the tolerable interference limit of the authorization system. since the authorized user does not need to know the presence of the non-authorized user, no additional overhead is brought to the authorized user; however, the interference limit of the authorization system is an upper limit value, and therefore the non-authorization system will adopt a relatively small power to transmit in order to avoid the interference to the authorization system; Even in the case where the authorized spectrum is completely idle, the non-authorization system will not transmit data with high power, which may affect the spectrum and power efficiency of the communication system. For overlay sharing, on the premise of meeting the communication requirement of the authorization system, the idle spectrum is provided to the non-authorization system, and the authorization system and the non-authorization system do not occupy the channel at the same time. The access spectrum of the non-authorization system opportunistic type results in additional overhead such as channel feedback and signaling, but the transmission power of the non-authorization system is not limited by the interference, and therefore it is possible to improve the energy efficiency of the system. This paper will focus on the research of the coverage-type energy-efficient cooperative spectrum sharing communication mechanism. The main innovation points are as follows: 1. In this paper, the resource allocation in the cooperative spectrum sharing mode of single transmission time interval (TTI) scheduling is analyzed. the frequency spectrum sharing mode of the single TTI scheduling is that the channel state of each link in the communication system in one TTI is kept unchanged, and the non-authorization secondary system is in cooperation with the transmission of the main system in one TTI, and a certain transmission time is required to be taken as the back-back in the TTI the co-sharing of the primary system and the secondary system is therefore dependent only on the channel shape of the links within one tti, In this paper, the wireless resource allocation problem of the energy consumption of the spectrum sharing cooperative communication system is minimized while the service quality of the authorization system and the non-authorization system are guaranteed, and the optimal time and power distribution closed form is obtained by the convex optimization theory. In this paper, the energy efficiency of the cooperative spectrum sharing and communication system is analyzed in this paper. 2. The spectrum sharing mechanism of multi-TIs scheduling is proposed in this paper, and the performance of the cooperative spectrum communication system is considered in consideration of the cost of the access handover. The spectrum sharing mode of the multi-TIs scheduling means that the channel state of each link in the multiple TIs communication system is changed, and the secondary system adaptively selects to relay the different TIs according to the state of the channel. and therefore, the multi-TIs scheduling can effectively utilize the time diversity gain of the channel fading to greatly improve the spectrum sharing communication system, The paper analyzes the problem of maximizing the throughput of the cooperative spectrum sharing communication system under the limitation of the energy limit of the authorization system and the non-authorization system and the service quality of the authorization system in the frequency spectrum sharing mode of the multi-TIs scheduling, and converts it into a limited Markov decision. The optimal spectral joint is obtained by the Lagrange method and the Q-learning algorithm. a policy is entered. However, the computational complexity of the algorithm will refer to the increase in the number of links in the communication system 3. In order to solve the problem of the computational complexity of the Markov decision algorithm, the association of multi-TIs scheduling based on the labor-consumption model is established in this paper. As a sharing mechanism, in this model, the system of authorization is guaranteed. On the premise that the secondary user ("a worker") in the non-authorization system obtains the transmission ("consumption") of the power and time (resources) that can be transmitted in the system for the own information through the information of the main user in the relay ("labor") authorization system, and the state of the channel can be considered as a "trunk>" market entry "< / trunk>, the worker can decide on the basis of the resources and the market environment And the next user of the model can adaptively select the timing of the relay and the access according to the channel state so as to improve the sharing communication. The performance of the system is further analyzed. The spectrum sharing mechanism of multi-user cooperative multi-TIs scheduling is analyzed, and the system performance and user access are discussed.
【学位授予单位】：北京邮电大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TN92
【参考文献】
相关期刊论文 前2条
1 陶晓明;肖潇;陆建华;;基于多域协同的绿色无线通信系统体系构架[J];电信科学;2011年03期
2 佘小勇;;绿色通信:引发通信业的新变革[J];中国电信业;2008年10期
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