• Wednesday, 14 July, 16:00-17:30, Rooms Theatre Big Stage
  • Session Chair: Leonardo Goratti (FBK Create-Net, Italy)



16:00 Optimum Multi-Subframe Scheduling for LTE Licensed-Assisted Access to Unlicensed Spectrum

Cheng-Jie Tsai and Tsern-Huei Lee (National Chiao Tung University, Taiwan)

Licensed-Assisted Access (LAA) is a new operation mode for the Long Term Evolution Advanced systems to transmit data via both licensed spectrum and unlicensed spectrum based on the framework of carrier aggregation. For LAA uplink (UL) transmission, there is a mismatch between resource allocation and actual data transmission due to the requirement of listen-before-talk (LBT). Such a mismatch may cause severe throughput degradation and, therefore, is an important issue to be addressed. In Release 14, two different ideas of multi-subframe scheduling (MSS) were proposed to improve UL throughput by allowing user equipments to either transmit data continuously for multiple subframes or have multiple opportunities to perform LBT. In this paper, we present a family of scheduling schemes which combines the two MSS ideas and evaluate its performance. The optimum one in the proposed family of schemes which maximizes throughput is determined.


16:18 Beyond WYSIWYG: Sharing Contextual Sensing Data Through mmWave V2V Communications

Cristina Perfecto (University of the Basque Country UPV/EHU, Spain); Javier Del Ser (TECNALIA, Spain); Mehdi Bennis (Centre of Wireless Communications, University of Oulu, Finland); Miren Nekane Bilbao (University of the Basque Country, Spain)

In vehicular scenarios context awareness is a key enabler for road safety and collision detection. However, the amount of contextual information that can be collected by a vehicle is stringently limited by the sensing technology itself (e.g. line-of-sight coverage) and by the low bandwidths offered by current wireless vehicular technologies such as 802.11p. Motivated by the upsurge of research around millimeter-wave V2X communications, in this work we propose a distributed vehicle-to-vehicle (V2V) association scheme for multi-beam vehicular communications that incorporates and leverages a quantitative measure of the potential value of the shared contextual information in the pairing process. First, we properly define the utility function of every vehicle leveraging classical channel state and queuing state information (CSI/QSI) with context information -i.e. sensing content resolution, timeliness and enhanced range of the sensing- and, next solve the problem via a distributed many-to-one matching game in a junction scenario with realistic vehicular mobility traces. It is shown that the average volume of collected useful information at the receivers when paired using our proposed scheme increases up to 71% compared to distance- and delay-based matching baselines when receivers are able to leverage information from different sources.


16:36 Physical Downlink Control Channel for 5G New Radio

Honglei Miao (Intel Deutschland GmbH); Michael Faerber (Intel Deutschland GmbH, Germany)

New radio technologies for the fifth generation of wireless system have been extensively studied globally. Specifically, air interface protocols for 5G radio access network will be standardized in coming years by 3GPP. All basic physical layer functions for the new radio system are currently under active development in 3GPP. Due to its crucial function in scheduled system, physical layer control channel is a core element to enable all physical layer data transmission. In particular, search space allocation and transmission schemes are fundamental problems of control channel design. Both aspects have ultimate impacts on achievable control channel coverage, capacity and spectrum efficiency. As such, search space design and promising transmission schemes for control channels are thoroughly studied in this paper. Both distributed and localized search spaces are proposed to accommodate different means of control channel transmission depending on availability of channel state information at the base station. Furthermore, two types of transmit diversity schemes with different diversity orders are developed and compared by Monte-Carlo simulations. It is demonstrated from simulation results that SFBC based transmit diversity outperforms per-RE precoder cycling scheme. Moreover, high order transmit diversity schemes are also proposed and simulation results thereof exhibit clear performance benefits.


16:54 Performance Evaluation of Adaptive Beamforming in 5G-V2X Networks

Ilmari Maskulainen, Petri Luoto and Pekka Pirinen (University of Oulu, Finland); Mehdi Bennis (Centre of Wireless Communications, University of Oulu, Finland); Kari Horneman (Nokia & Bell Labs, Finland); Matti Latva-aho (UoOulu, Finland)

Vehicles are the third fastest growing connected device type after smart phones and tablets. Also, automotive industry is interested to get more vehicles connected to the internet to improve traffic safety and efficiency. This creates a need for Vehicle-to-Everything (V2X) communications. In this work, the possibility of exploiting beamforming in LTE-V2X is considered. Singular value decomposition (SVD) receiver and precoder is implemented in an LTE-A system level simulator and the performance on multi-lane highway scenario is simulated and analyzed in downlink Vehicle-to-Infrastructure (V2I) scenario. The performance is compared to the conventional maximum-ratio combining (MRC) and LTE codebook precoded minimum mean square error (MMSE) receivers. In addition, the switched-beam beamforming is imitated by modified antenna patterns with 7 and 15 narrow beams. The results show that the SVD receiver provides gain compared to the conventional MRC and MMSE receivers in ideal scenario. Furthermore, with modified antenna patterns, the performance was enhanced when compared to the default antenna pattern.


17:12 Future of Mobile

Mischa Dohler, Toktam Mahmoodi, Maria Lema and Massimo Condoluci (King's College London, United Kingdom (Great Britain))

We are the last global eco-system which still advances its entire technology family in generations, having started as a 1G-niche and now entering the transformational era of 5G. The typical 10-years innovation cycles between generations, the Gs, worked well in the past but are unfortunately not adequate for the future. Based on some past trends, the aim of this paper is to develop a technology and innovation roadmap for the mobile ecosystem. Notably, required technology disruptions to the cellular infrastructure are discussed as well as much-needed changes in the overall innovation landscape suggested, which would enable a massive shift from selling the cost of connectivity to co-creating value in ubiquitous connectivity.