Caching in Future Mobile Networks: Utilize Memory to Overcome Spectrum Shortage

随着移动的电话的出现，加上经济基础设施设备的可用性，为用户提供了无线通信和执行日常任务的自由。随着无线技术的成熟，5G和物联网等新标准的出现，使用户能够随时随地灵活地访问信息。然而，信息在无线信道上的传输使其容易受到窃听。安全性现在被认为是现代通信架构设计中不可或缺的元素。在这个项目中，我们的目标是从经典的加密方法，安全问题处理在协议栈的上层，通过开发一个框架，利用物理层的属性来保护信息。因此，通过所提出的框架的安全性可以单独实现，或者可以作为额外的保护层添加到传统的通信架构中，以进一步保护它。在计划的项目中，我们打算研究一类特殊的广播信道，其中接收器被允许合作。在发射机侧的协作的概念是相当好理解的，其中用户共享其资源以将信息发送到中央服务器或接入点。接收方合作的问题是一个相当新的问题，似乎还不太为人所了解。这个项目的目标是调查在一些实际的约束条件下，在广播信道的接收机合作的某些方面。特别是，我们计划重新审视状态信息的不同质量的作用，例如，因果关系，严格因果关系或非因果关系及其对保密的影响。

With the advent of mobile telephony, complemented by the availability of economic infrastructure devices has provided users the freedom to communicate and perform everyday tasks wirelessly. As wireless technology matures, new standards like 5G and Internet-of-Things emerge that give users the flexibility to access information anywhere-anytime. However, the transmission of information over wireless channels makes it vulnerable to eavesdropping. Security is now considered as an integral element in the design of modern communication architectures. In this project, we aim to diverge from the classic cryptographic approach where security issues are dealt in the upper layers of the protocol stack, by developing a framework that secures information by exploiting the attributes of the physical layer. Thus, security via the proposed framework can be implemented separately or can be added as an extra layer of protection in the conventional communication architecture to secure it even further. In the planned project, we intend to study a special class of a broadcast channel, where the receivers are allowed to cooperate. The concept of cooperation at the transmitter side, where the users share their resources to transmit information to a central server or access point is fairly well understood. The problem of receiver cooperation is fairly new and appears to be less understood. The goal of this project is to investigate certain aspects of receiver cooperation in the broadcast channel under some practical constraints. In particular, we plan to revisit the role of different quality of state information, for example, causal, strictly causal or non-causal and its impact on secrecy.