摘要
针对在LTE-A(long-term evolution-advanced)上行蜂窝链路与设备直通(deviceto-device,D2D)链路间的同频干扰问题,联合功率控制和信道分配最大化系统频带利用率,同时保证已有蜂窝链路的服务质量需求.此外模型中假设单条D2D链路容许复用多条连续的信道资源.考虑到原问题的复杂性,将其分解为功率控制和信道分配两部分:其中,功率控制部分可借助凸优化分析,而在上述最优解的基础上,信道分配部分等价于经典的集合划分问题,一般意义下为NP-hard(nondeterministic polynomial-time hard)难题,继而设计了一种多项式时间复杂度的贪婪算法来实现性能与复杂度之间的折中.仿真结果表明,所提联合资源优化方案优于单一资源优化方案以及单D2D链路仅能复用单信道的联合资源优化方案,而且其性能接近由分支界限法得到的全局最优解.
To cope with co-channel interference between existing long-term evolution-advanced( LTE-A) uplink cellular links and device-to-device( D2D) links,power control and channel assignment are jointly considered to optimize spectral efficiency under the quality-of-service requirement of prioritized cellular links. Each D2 D link can reuse multiple continuous channels. Given the complexity of the original problem,we decompose it into two sub-problems: power control and channel assignment. The design of power control can be analyzed via convex optimization,and on the basis of the above optimum,the design of channel assignment is the classic set partitioning problem,which is generally an NP-hard problem. Thus,a greedy algorithm with polynomial-time complexity is proposed to achieve a balance between performance and complexity. Simulation results show that the proposed joint resource allocation scheme outperforms those with a single resource variable and also those where multi-channel reuse is not enabled. Moreover,the performance of the proposed scheme is close to the global optimum derived by the branch-and-bound method.
出处
《信息与控制》
CSCD
北大核心
2017年第2期231-237,256,共8页
Information and Control
基金
国家自然科学基金资助项目(41472234)
陕西省高等教育教学改革研究项目(15BY122)
西安培华学院校级资助项目(PHKT16045)
关键词
高级长期演进蜂窝网络
设备直通
资源分配
凸优化
集合划分问题
long-term evolution-advanced cellular network
device-to-device
resource allocation
convex optimization
set partitioning problem
