Full Paper Submission:
Jul. 10, 2015 (final extension)
Jul. 3, 2015
Notification of Acceptance:
Jul. 23, 2015 (NEW)
Jul. 17, 2015
Final Camera Ready:
Jul. 30, 2015 (NEW)
Jul. 24, 2015
Aug. 30, 2015
Location: Hongkong, China
06/08/2015: Keynote speaker information update.
03/08/2015: Program is uploaded. Each presenter (except keynote) has 20 mins for presentation including Q&A.
21/07/2015: Notification of acceptance date is updated.
04/07/2015: Submission deadline extended.
22/06/2015: NTT DoCoMo will be one of our keynote speakers.
15/06/2015: Advisory board is added.
08/06/2015: CFP is uploaded.
14/04/2015: Homepage is set up.
Keynote Speaker <Dr. Yoshihisa Kishiyama, NTT DOCOMO>
Dr. Yoshihisa Kishiyama received his B.E., M.E., and Dr. Eng. degrees from Hokkaido University, Japan in 1998, 2000, and 2010, respectively. Since he joined NTT DOCOMO, INC. in 2020, he has been involved in research and standardization activities for 4G LTE/LTE-Advanced and 5G. He is currently a Senior Research Engineer of 5G Laboratory in NTT DOCOMO for 5G radio access network research group. His current research interests include massive MIMO/beamforming technologies, non-orthogonal multiple access (NOMA), 5G experimental trials, and so on. In 2012, he received the International Telecommunication Union Association of Japan (ITU-AJ) Encouragement Award for his contributions to LTE international standardization.
5G Concept and Realization Approach toward 2020 and Beyond
Recently, LTE has become the mainstream of mobile technologies, and global expectations for the next generation mobile technology (5G) are rapidly growing toward 2020 and beyond. In this talk, our 5G technical concept based on the combination of LTE enhancements and new RAT, which will make it possible efficiently to support variable 5G use cases such as Internet of Things (IoT) and enhanced mobile broadband (eMBB) using a wider range of frequency bands including cmWave and mmWave, is introduced. This will be followed by our 5G evolution strategy called "phased approach" considering standardization time plan and system deployment migration for 2020 and beyond. Finally, recent our R&D activities including experimental trials are explained.
The enormous increase in the mobile connected equipment and mobile subscribers number, in addition to the emergence of data-centric standards such as 3GPP’s LTE-A raises an urgent call to find sustainable solution that permits to fulfil data rate, spectrum, and coverage requirements. Data rate has been increasing exponentially over the last decade since mobile users want access to the internet and mobile services anytime anywhere. However, the resources are scarce and the frequency spectrum availability is limited. More challenges are imposed like the energy consumption of the network. Adding cellular macro base station to the existing cellular network is energy consuming and very expensive. Macro base stations are very high power nodes with high energy consumption. Deploying such base stations increases dramatically the CAPEX (Capital Expenditure) due to the installation costs, as well as the OPEX (Operating Expenditure) for the base stations maintenance and operations. This solution also suffers from the inevitable out-of-cell interference issues. Making matters worse, conventional macro cell transmissions suffer from poor indoor penetration and the presence of dead-spots particularly at higher carrier frequencies, which results in drastically reduced indoor coverage and diminished user satisfaction. Mobile networks need a low cost, low power, energy efficient, and easy to deploy solution, which satisfies the ever-growing capacity demand. A promising approach to solving this problem is through the deployment of Heterogeneous and Small Cell Networks (HetNets), which represent a novel networking paradigm based on the idea of deploying low-power, and low-cost base stations operating in conjunction with the macro-cellular network infrastructure. HetNets encompass a broad variety of cell types, such as micro-, pico-, femto-cells, as well as advanced wireless relays, and distributed antenna systems. A variety of spectrum candidates i.e. below or above 6GHz are also being considered to newly allocate for HetNets. The use of HetNets is envisioned to enable next-generation 5G networks to provide high data rates, allow offloading traffic from the macro cell, minimizing energy consumption and providing dedicated capacity to homes, enterprises, or urban hotspots. All such technologies, combined with emerging paradigms such as mm-wave communication are expected to lie at the heart of 5G wireless systems.
The deployment of small cells in realistic environments faces several technical challenges that need to be addressed at various network layers. In particular, due to lack of coordination with the rest of the network, time- and frequency domain interference management in dense heterogeneous networks is a fundamental issue. By exploiting ideas from traditional multi- cell power control, cognitive radio and dynamic spectrum access, HetNets should be designed to deal with peak data demands, and react based on interference/load/congestion levels, by adapting their transmission strategy and opportunistically accessing radio resources over licensed and unlicensed bands. Recently, in addition to the integration of cellular and WiFi that has emerged as a key component to tackle the capacity crunch problem and ease network congestion, new solutions has been proposed to increase network efficiency. C-RAN is a novel network architecture which is centralized, cooperative, and embraces cloud computing. This architecture can allow baseband sharing, reducing energy consumption, and improving network performance. Furthermore, recent advances in the understanding of interference channels, cooperative games and distributed optimization theory could be useful for novel designs of the next generation of HetNets. Small cell networks could benefit from backhaul coordinated multi-point (CoMP) transmission schemes wherein multiple base stations steer their beams through array processing to minimize interference. Interference coordination is also another solution to minimize interference and to improve the network performance. Coordination between small cells is not restricted to resources management. Recently, base stations clustering and coordination has been studied as a mean for improving the network energy efficiency, users’ quality of experience, and for delivering cloud services via cooperation and via pooling computational and communication resources. Base station should also cooperate for delivering cloud services. HetNet could also benefit from cloud cooperation and virtual operation implementation in order to operate efficiently. In addition, with the existence of several networks and the usage of different radio access technologies imposes overarching requirements for a multi-RAT architecture evolution. Finally, research on small cell networks also tackles several issues that contribute in making HetNet operate more efficiently via cloud cooperation such as mobility management, service centric scheduling, and U/C splitting.
This one full-day workshop is co-located with the IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (http://pimrc2015.eee.hku.hk/). The main objective of the workshop is to offer an opportunity for academic and industrial researchers for promoting HetNets including the emerging mm-wave communication technologies in 5G cellular networks to be more energy efficient and more area spectrally efficient than they are today. The 9th WDN workshop will be a progression of the previous successful editions providing again an opportunity for information exchange.