基于用户可信度的协作通信关键技术研究

The development of mobile networks and the increasing signal processing capabilities of terminals make user cooperation possible. However, most terminals are owned by individuals, and the relationships and behaviors among users directly affect the effectiveness and security of cooperation, thus the trust degree is becoming an important factor influencing the strategies of user cooperation. Predictably, the cooperation techniques based on the trust degree will play an increasingly important role in the next generation of mobile communications. However, there are still several key problems that need to be solved. Being aware of these unsolved problems, we firstly consider the user cooperation strategy in the cooperative communication networks to propose a more efficient cooperative transmission method, secondly investigate the secure transmission for physical layer with the consideration of untrusted cooperative user and utilize its physical resource to enhance the expected secrecy rate of system, finally study the wireless information and energy cooperation among users to allocate the wireless resources more efficiently, while taking the known, the inaccurate and the real-time update of the trust degree into account, respectively, in order to establish a solid basis for the high-speed, high-efficiency, as well as high-security cooperative communication networks.

移动网络的不断发展以及终端信息处理能力的不断增强，使得用户之间的协作成为可能。然而大部分终端都隶属于个人，用户之间的关系和行为会直接影响协作的有效性和安全性，因此用户可信度逐渐成为影响用户协作的重要因素。可以预见，基于用户可信度的协作技术将在下一代移动通信中扮演着愈发重要的角色，而与此相关的研究尚处于起步阶段，仍有许多关键问题有待解决。鉴于此，本项目基于用户可信度已知、可信度测量不精确以及可信度实时更新等理想和现实情况，首先对协作通信网络中用户协作策略开展研究，提出更为高效的协作传输方法，进一步研究当协作用户不可信时的物理层安全传输策略，充分利用非可信用户的物理资源，以提高系统期望安全速率，最后研究用户之间的无线信息和能量合作，有效解决无线资源分配问题，最终为构建高速、高效以及安全的协作通信系统打下基础。

随着对移动边缘计算系统及其相关技术的不断研究，移动边缘计算将持续提高“边缘”的处理能力，减少终端的负担，提供一个强大的平台解决未来网络的时延、安全传输、拥塞和容量等问题。然而，移动边缘计算网络通常资源受限，其计算能力、缓存容量相对有限，日益增多的终端数目和业务种类，不断提高的用户体验需求，进一步加大了MEC网络的负荷以及资源分配难度。基于此，本项目拟以移动边缘计算技术为手段，实现时延敏感型MEC网络中高效、智能且安全的数据卸载为目标，对资源分配、智能决策、网络安全问题开展研究，为构建高效、智能以及安全的时延敏感型MEC系统打下基础。