无线资源多域变换/逆变换及其在无线云中的应用

This research focuses on the collaborative management of the heterogeneous radio resources distributed in different systems so that the telecommunication requirements of the wireless clouds can be met. The current radio resource collaborative management schems use the remaining spectral bandwidth in the networks as a formation of users' resource to be allocated. However,in most wireless networks such as Cellular networks,WLAN and WPAN networks,the radio recources occupied by the users are not presented directly by sections of spectal bandwidth. For example,the whole spectal bandwidth of the network is occupied by a user using Spread spectrum technology(CDMA networks) or competition technology(WLAN networks),and resources presented in the LTE system (using OFDMA tecnology) is the two dimensional time-frequency blocks. So it is difficult to allocate the sections of the spectal bandwidth directly to users in wireless-cloud. From this perspective, current researches use the spectal bandwidth roughly as the resources to be allocated to users, while ignoreing the characteristics of the resources in different physical layers and making those algorithms hard to be impletmented. This research propoed to transform the resources in different orthogonal space into frequency domain space,which makes the radio resource in different networks have a common fundation to be depatched,exchanged and managed. Based on it, serveral kinds of so-called "long-term" benefit maximization based algorithm are designed to allocate resources to users in wirless-cloud.

研究将分布在不同系统中的异构无线资源进行融合管理，以满足无线云对通信的要求。目前无线资源融合管理以网络的剩余可用频谱带宽作为用户资源分配形式，然而多数无线网如：蜂窝网、WLAN、WPAN，其用户占用的无线资源都不是以一段段的带宽表达的，比如以扩频（WCDMA）或竞争（WLAN）的方式占有整个网络带宽，或占用二维时频块（LTE之OFDMA），因此难以直接用某段带宽的形式为无线云用户分配无线资源。从这个层面看，目前研究笼统地以带宽作为用户资源占用表达，过分屏蔽了物理层的资源特性而使得资源管理算法难以应用。本研究提出将分布在不同正交空间上的资源统一变换到频域空间，使不同的网络无线资源有统一调度、兑换和管理的基础，在此基础上设计各种"长期"收益最大化算法，为无线云用户分配资源。

本项目研究无线资源多域变换/逆变换及其在无线云中的应用。针对目前研究笼统地以带宽作为用户资源占用表达，过分屏蔽了物理层的资源特性的情况，本项目首先提出了多域正交空间频域变换的概念和方法，对异构网络资源进行统一量化，完成了WLAN和OFDMA的资源映射。将不同域的资源映射到频域上，转化为等效带宽，解决了无线云资源分配中不同业务占用的资源表达。在此基础上，提出了异构网络融合环境下的无线云准入控制和网络切换相关的算法，能够有效地提高网络接入和切换的效率，缩短切换时延。同时提出了各种优化目标（如能量最小、吞吐量最大）下能保证QoS的无线云短时资源分配方法，相比于传统的资源分配算法可以达到更高的吞吐量以及更小的能量。最后，探索了网络选择层和MAC层的联合资源优化以及基于软件定义网络的云业务上行调度方案，同样达到了整合优化资源配置，保障无线云用户业务QoS的效果。

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