Abstract
Fifth generation (5G) technical requirements turned toward end-to-end capacity increase with limited latency and constant network power consumption involve dedicated research topics. Multiple radio access techniques are one of the most promising paradigm safeguarding throughput increase and seamless connectivity in heterogeneous networks. Link adaptation metrics are then required to achieve radio link selection and multiple interface management. Following mobile network capacity increase trends, link adaptation metrics focused on spectrum efficiency maximization are implicitly sought, involving high network power consumption. This paper presents a novel link adaptation metric turned toward a power efficient radio link selection which warrants QoS and performs a fair comparison between independent air interfaces in a multiple radio access technique context. A procedure is proposed to practically evaluate the metric upon each air interface, thanks to the introducion of new normalized propagation selectivity parameters with respect to system parameters allowing a unified characterization of the propagation link reliability, tuning up the metric decision. Performance and transmit power gains resulting from the metric application are appraised upon wireless hot spot extensions covering 5GHz and 60GHz Wi-Fi technologies and mm-wave ultra-wide-band transmissions.
Highlights
Fifth generation (5G) technical requirements [1] turned toward 1000 time end-to-end capacity increase with latency up to 1 ms and optimized network power consumption involve new research topics
The assessment method proposed for the Green Link Budget (GLB) metric is similar, in providing, for each air interface (AI) and transmission mode (TM), evolved look-up table (LUT) with a line of sight (LOS)/non-line of sight (NLOS) radio link identification, and the use of multipath channel margin (MCM) and path-loss margin (PLM) outputs to compare independent interfaces
The Spatial time block coding (STBC) TM using the Alamouti code provides an additional gain set to 2–3 dB with respect to Spatial division multiplex (SDM) (2,2,4) QPSK 3/4 TM. β-metric variations depicted on Fig. 11 translate quite similar gains as the α-metric
Summary
Fifth generation (5G) technical requirements [1] turned toward 1000 time end-to-end capacity increase with latency up to 1 ms and optimized network power consumption involve new research topics. Multiple radio access techniques (multi-RAT) deployed in heterogeneous networks (HetNets) is one of the most promising solutions to improve network capacity and ensure seamless connectivity with a high quality of service (QoS). Multi-RAT management processing [2] performed with power efficiency (PE) link adaptation techniques and scalable spectrum management will ensure seamless connectivity in a high multi-user context, limiting multiuser interference, and guarantying QoS along with radio coverage. Innovative power efficient cooperative networks justify matter of necessity to develop new link adaptation metrics. Multi-RAT architectures are examined, regarding novel power-efficient link adaptation metrics enable to switch between RATs [2] and their integration into innovative control/user (C/U) plane splitting architectures [8,9,10] in accordance with the 3GPP wireless local area network/Long Term Evolution-Advanced (WLAN/LTE-A) carrier aggregation study item [11]. In the GreenTouch Consortium [12] and MiWEBA project
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