Transmit Power Optimization and Feasibility Analysis of Self-Backhauling Full-Duplex Radio Access Systems

被引:15
|
作者
Korpi, Dani [1 ]
Riihonen, Taneli [1 ]
Sabharwal, Ashutosh [2 ]
Valkama, Mikko [1 ]
机构
[1] Tampere Univ Technol, Lab Elect & Commun Engn, FI-33720 Tampere, Finland
[2] Rice Univ, Dept Elect & Comp Engn, Houston, TX 77005 USA
基金
芬兰科学院;
关键词
Self-backhauling; full-duplex wireless; massive MIMO; transmit power optimization; INTERFERENCE CANCELLATION; NETWORKS; 5G; RELAYS;
D O I
10.1109/TWC.2018.2821682
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We analyze an inband full-duplex access node that is serving mobile users while simultaneously connecting to a core network over a wireless backhaul link, utilizing the same frequency band for all communication tasks. Such wireless self-backhauling is an intriguing option for the next generation wireless systems since a wired backhaul connection might not be economically viable if the access nodes are deployed densely. In particular, we derive the optimal transmit power allocation for such a system in closed form under quality-of-service (QoS) requirements, which are defined in terms of the minimum data rates for each mobile user. For comparison, the optimal transmit power allocation is solved also for two reference scenarios: a purely half-duplex access node, and a relay-type full-duplex access node. Based on the obtained expressions for the optimal transmit powers, we then show that the systems utilizing a full-duplex capable access node have a fundamental feasibility boundary, meaning that there are circumstances under which the QoS requirements cannot be fulfilled using finite transmit powers. This fundamental feasibility boundary is also derived in closed form. The feasibility boundaries and optimal transmit powers are then numerically evaluated in order to compare the different communication schemes. In general, utilizing the purely full-duplex access node results in the lowest transmit powers for all the communicating parties, although there are some network geometries under which such a system is not capable of reaching the required minimum data rates. In addition, the numerical results indicate that a full-duplex capable access node is best suited for relatively small cells.
引用
收藏
页码:4219 / 4236
页数:18
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