Wei Jiang

Wei Jiang
Deutsches Forschungszentrum für Künstliche Intelligenz | DFKI · Intelligent Networking

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85
Publications
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Publications

Publications (85)
Conference Paper
Artificial intelligence (AI) based channel state information (CSI) prediction for frequency division duplexing (FDD) massive multiple-input multiple-output (MIMO) systems have attracted growing attention recently. Accurate channel prediction can effectively improve the quality of CSI and can help optimize system transmission schemes, such as through...
Conference Paper
Full-text available
In order to achieve terabits-per-second (Tbps) data rates in the sixth-generation (6G) mobile system, wireless communications are required to exploit the abundant spectrum in the millimeter-wave (mmWave) and terahertz (THz) bands. However, high-frequency transmission heavily relies on high beamforming gain to compensate for severe propagation loss....
Conference Paper
Full-text available
To meet the demand of supreme data rates in terabits-per-second, the next-generation mobile system needs to exploit the abundant spectrum in the millimeter-wave and terahertz bands. However, high-frequency transmission heavily relies on large-scale antenna arrays to reap high beamforming gain, used to compensate for severe propagation loss. It rais...
Preprint
In order to achieve a unprecedented terabits-per-second (Tbps) data rate in the sixth-generation (6G) mobile system, wireless communications require far more bandwidth, which cannot be available under the current spectrum-usage paradigm. Therefore, the 6G system has to exploit the abundant spectrum in the high-frequency bands, i.e., millimeter wave...
Preprint
In order to achieve a unprecedented terabits-per-second (Tbps) data rate in the sixth-generation (6G) mobile system, wireless communications require far more bandwidth, which cannot be available under the current spectrum-usage paradigm. Therefore, the 6G system has to exploit the abundant spectrum in the high-frequency bands, i.e., millimeter wave...
Preprint
To realize a unprecedentedly high data speed in terabits-per-second (Tbps), the upcoming sixth-generation (6G) mobile communications system needs to utilize the abundant spectrum in the terahertz bands. However, high-frequency transmission suffers severe propagation loss and short transmission distance, which would be heavily relies on a large-scal...
Preprint
To realize a unprecedentedly high data speed in terabits-per-second (Tbps), the upcoming sixth-generation (6G) mobile communications system needs to utilize the abundant spectrum in the terahertz bands. However, high-frequency transmission suffers severe propagation loss and short transmission distance, which would be heavily relies on a large-scal...
Article
Full-text available
To meet the radical technical requirements specified by ITU-R IMT-2020, the fifth Generation (5G) mobile system will become more complicated and heterogeneous. It imposes a great challenge on today's network managing approaches, which are already costly, vulnerable, time-consuming and therefore inap-plicable to the 5G system. By applying machine le...
Preprint
The Fifth-Generation (5G) mobile communications system is now on its way to being deployed worldwide and the scale of 5G subscribers in some region has reached a very large scale. However, the attention of academia and industry is increasingly shifting towards the next generation technology called Sixth Generation (6G) and many pioneering works are...
Article
Full-text available
The Internet of Things (IoT) edge network has connected lots of heterogeneous smart devices, thanks to unmanned aerial vehicles (UAVs) and their groundbreaking emerging applications. Limited computational capacity and energy availability have been major factors hindering the performance of edge user equipment (UE) and IoT devices in IoT edge networ...
Preprint
Complexity and heterogeneity of the fifth generation (5G) and beyond mobile systems impose a great challenge on current network managing approaches, which are vulnerable, time-consuming and costly. The state-of-the-art research direction in this field is to apply machine learning (ML) techniques to realize intelligent and highly self-organized netw...
Preprint
Complexity and heterogeneity of the fifth generation (5G) and beyond mobile systems impose a great challenge on current network managing approaches, which are vulnerable, time-consuming and costly. The state-of-the-art research direction in this field is to apply machine learning (ML) techniques to realize intelligent and highly self-organized netw...
Article
With the increasing threat of global warming due to high energy consumption of wireless network infrastructure, cell activation complements the capabilities of next-generation wireless technology. In this article, we propose an energy consumption optimization strategy based on deep reinforcement learning (DRL) and transfer learning (TL) techniques....
Article
Cloud radio access networks (C-RANs) have been regarded in recent times as a promising concept in future 5G technologies where all DSP processors are moved into a central base band unit (BBU) pool in the cloud, and distributed remote radio heads (RRHs) compress and forward received radio signals from mobile users to the BBUs through radio links. In...
Article
As of today, the fifth generation (5G) mobile communication system has been rolled out in many countries and the number of 5G subscribers already reaches a very large scale. It is time for academia and industry to shift their attention towards the next generation. At this crossroad, an overview of the current state of the art and a vision of future...
Preprint
Opportunistic relay selection (ORS) has been recognized as a simple but efficient method for mobile nodes to achieve cooperative diversity in slow fading channels. However, the wrong selection of the best relay arising from outdated channel state information (CSI) in fast time-varying channels substantially degrades its performance. With the prolif...
Preprint
Full-text available
p>As of today, the fifth generation (5G) mobile communication system has been rolled out in many countries and the number of 5G subscribers already reaches a very large scale. It is time for academia and industry to shift their attention towards the next generation. At this crossroad, an overview of the current state of the art and a vision of futu...
Preprint
Full-text available
p>As of today, the fifth generation (5G) mobile communication system has been rolled out in many countries and the number of 5G subscribers already reaches a very large scale. It is time for academia and industry to shift their attention towards the next generation. At this crossroad, an overview of the current state of the art and a vision of futu...
Preprint
As of today, 5G mobile systems have been already widely rolled out, it is the right time for academia and industry to explore the next generation mobile communication system beyond 5G. To this end, this paper provides an abstracted survey for the 6G mobile system. We shed light on the key driving factors for 6G through predicting the growth trend o...
Preprint
Full-text available
p>As of today, the fifth generation (5G) mobile communication system has been rolled out in many countries and the number of 5G subscribers already reaches a very large scale. It is time for academia and industry to shift their attention towards the next generation. At this crossroad, an overview of the current state of the art and a vision of futu...
Preprint
Full-text available
The fourth-generation Wireless Technology (4G) has been adopted by all major operators in the world and has already ruled the cellular landscape for around a decade. A lot of researches and new technologies are being considered as potential elements contributing to the next generation wireless communication (5G). The lack of realistic and flexible...
Preprint
With the advent of the Internet-of-Things (IoT) together with the fourth industrial revolution and its fusion of technologies into so-called Cyber Physical Production Systems (CPPS) and Industrial Internet of Things (IIoT) new application scenarios arise. Due to the driving forces of mobility and flexibility, the number of interconnected entities i...
Article
Full-text available
Considering bandwidth-hungry and low latency requirement of vehicular communications applications, we propose a novel dynamic reinforcement learning-based slicing framework and optimization solutions for efficient resource provisioning in virtualized network for D2D-based vehicle-to-vehicle (V2V) communication. The aim is to balance resource utiliz...
Article
Full-text available
Channel state information (CSI), which enables wireless systems to adapt their transmission parameters to instantaneous channel conditions and consequently achieve great performance boost, plays an increasingly vital role in mobile communications. However, getting accurate CSI is challenging due mainly to rapid channel variation caused by multi-pat...
Article
Heterogeneous cloud radio access network (H-CRAN) is a promising technology to help overcome the traffic density which in 5G communication networks. One of the main challenges that will arise in H-CRAN is how to minimize energy consumption. In this paper, a deep reinforcement learning method is used to minimize energy consumption. Firstly, we propo...
Article
The emerging future generation 5G technology is expected to support service-oriented virtualized networks where different network applications provide unique services. 5G networks have the potential to allow completely different slices to co-exist in a substrate network and satisfy the differentiated requirements of various users. In networks with...
Chapter
This chapter provides a comprehensive introduction to channel prediction methods with an emphasis on neural network‐based prediction. It first briefly describes adaptive transmission systems using transmit antenna selection and opportunistic relaying as examples, followed by the impact of outdated channel state information (CSI) on the performance...
Article
Full-text available
By adapting transmission parameters such as the constellation size, coding rate, and transmit power to instantaneous channel conditions, adaptive wireless communications can potentially achieve great performance. To realize this potential, accurate channel state information (CSI) is required at the transmitter. However, unless the mobile speed is v...
Article
Network slicing has been introduced in fifth-generation (5G) systems to satisfy requirements of diverse applications from various service providers operating on a common shared infrastructure. However, heterogeneous characteristics of slices have not been widely explored. In this paper, we investigate dynamic network slicing strategies with mixed t...
Article
Full-text available
The introduction of 5G will see exponential growth in the amount of data generated in mobile networks. This huge growth in data volume will put great pressure on not only the wireless access network but also the backhaul. In-network caching as a key component of 5G targets faster download speeds and reduction in latency through efficient content pl...
Article
Full-text available
Information-centric networks operate under the assumption that all network components have built-in caching capabilities. Integrating the caching strategies of information centric networking (ICN) with wireless virtualization improves the gain of virtual infrastructure content caching. In this paper, we propose a framework for software-defined info...
Article
Full-text available
The elastic reconstruction of 5G network services is expected to provide the capability of network slice orchestration to access the network on demand, guarantee service experience on demand, and construct services on demand as well as to construct basic network services with lower costs. It is challenging to have different applications served inde...
Article
Full-text available
The continuous increase in the cost of energy production and concerns for environmental sustainability are leading research communities, governments and industries to amass efforts to reduce energy consumption and global CO2 footprint. Players in the information and communication industry are keen on reducing the operational expenditures (OpEx) and...
Article
In recent years, dense small cell network has been deployed to address the challenge that has resulted from the unprecendented growth of mobile data traffic and users. It has proven to be a cost efficeient solution to offload traffic from macro-cells. Software defined heterogeneous wireless network can decouple the control plane from the data plane...
Conference Paper
In this paper, a wireless test bed for demonstrating intelligent management in virtualized network infrastructure is presented. To instantiate virtual networks on demand including Network Function Virtualization (NFV) OpenStack is applied. In addition, OpenAirInterface (OAI) is integrated into the test bed to support realistic wireless scenarios. T...
Chapter
This chapter provides an insight into network management and orchestration in the 5th generation (5G), in particular highlighting how software‐defined networking (SDN) and network function virtualization (NFV) will enable increased agility, scalability, and faster time‐to‐market of 5G communication networks. It introduces the main concepts of manag...
Research
The application of Internet of Things (IoT) in the next generation cellular networks imposes a new characteristic on the data traffic, where a massive number of small packets need to be transmitted. In addition, some emerging IoT-based emergency services require a real-time data delivery within a few milliseconds, referring to as ultra-low latency...
Article
Full-text available
The application of Internet of Things (IoT) in the next generation cellular networks imposes a new characteristic on the data traffic, where a massive number of small packets need to be transmitted. In addition, some emerging IoT-based emergency services require a real-time data delivery within a few milliseconds, referring to as ultra-low latency...
Conference Paper
The maintenance and management for the current Fourth Generation (4G) networks are still in a manual and semi-automatic manner, which are costly and time-consuming. This imposes a great challenge on the network management of heterogeneous, software-defined and virtualized Fifth Generation (5G) systems. With the advent of network intelligence, a pos...
Conference Paper
The Fifth Generation (5G) system is envisioned to become more complicated, which imposes a great challenge on network management. But today’s manual and semi-automatic managing approaches are already costly and time-consuming.Thanks to new technologies, such as software-defined networking and network function virtualization, a possibility of autono...
Article
To address the challenge of unprecedented growth in mobile data traffic, ultra-dense network deployment is a cost efficient solution to offload the traffic over some small cells. The overlapped coverage areas of small cells create more than one candidate access points for one mobile user. Signal strength based user association in IEEE 802.11 result...
Chapter
This chapter describes the filter bank multi&;#x02010;carrier (FBMC) scheme with a prototype filter as used by the PHYDYAS project. It reviews the classical schemes of filtered orthogonal frequency division multiplexing (OFDM) and compares with the FBMC in terms of the out&;#x02010;of&;#x02010;band (OOB) performance achieved and its implementation...
Article
Nowadays, mobile networks are complex sets of heterogeneous equipments that use proprietary management applications, resulting in a huge expenditure, a large effort and a time-consuming process to manage all network elements by means of currently manual or semi-automatical approaches. With the emergency of new technologies, such software-defined ne...
Article
To meet the challenging key performance indicators of the fifth generation (5G) system, the network infrastructure becomes more heterogeneous and complex. This will bring a high pressure on the reduction of OPEX and the improvement of the user experience. Hence, shifting today’s manual and semi-automatic network management into an autonomic and...
Article
Up to now, a closed-form expression of the ergodic capacity for amplify-and-forward opportunistic relaying in the presence of outdated channel state information(CSI) is still not available in the literature. That is mainly due to the mathematical intractability in the conventional performance analysis through manipulations of probability density fu...
Article
Full-text available
Using outdated channel state information (CSI) in an opportunistic relaying system (ORS) leads to wrong selection of the best relay, which substantially deteriorates its performance. In this paper, therefore, we propose a robust cooperative scheme coined opportunistic space-time coding (OSTC) to deal with the outdated CSI. A predefined number (i.e....
Article
Until now, the performance analysis of Generalized Selection Combining (GSC) applied to cooperative diversity networks in the presence of outdated channel state information (CSI) is still not available in the literature. In this paper, therefore, we derive closed-form expressions of the ergodic capacity and outage probability for amplify-and-forwar...
Conference Paper
Full-text available
To rapidly deploy a communication network in the aftermath of disaster or emergency event, an Aerial-Terrestrial architecture integrating aerial base stations mounted on the balloons has been investigated in EU FP7 ABSOLUTE project. Since the signal coverage provided by aerial base stations is patchy and unstable, the opportunistic relaying is appl...
Conference Paper
In this paper, we propose a novel scheme coined opportunistic space-time coding (OSTC) to deal with the outdated channel state information (CSI) problem for opportunistic relay selection (ORS) systems. A pair of relays, instead of a single relay, is opportunistically selected in terms of the instantaneous CSIs. Alamouti scheme, a unique space-time...
Conference Paper
To enable the rapid deployment of a public safety communication network, a novel system architecture integrating an aerial base station mounted on a low-altitude platform has drawn many attentions. However, the signal coverage provided by such a rapidly-deployed network is patchy and unstable, which conflict with the high requirement on link reliab...
Conference Paper
Recently, there has been an increasing interest in enhancing the mainstream cellular technology Long Term Evolution Advanced (LTE-A) with cognitive radio as one of the key enablers towards the fifth generation (5G) wireless communications. For dynamically accessing wider range of spectrum bands in a friendly manner, the cognitive LTE system should...
Conference Paper
To combat the bottleneck effect in the relay channels, this paper proposes a simple power-control algorithm for decode-and-forward cooperative networks with opportunistic relay selection. Taking advantage of the existing channel state information, which is a by-product during the process of relay selection, an optimal power allocation factor can be...
Article
Full-text available
Cognitive Radio (CR) has received tremendous interest during the past decade from almost all research disciplines in wireless communications. Meanwhile, companies across the world in the value chain are showing more and more interest in CR. This is due to the expected significant scarcity of spectrum caused by data-consuming modern smartphones or s...
Conference Paper
This paper presents a robust radio access technology (RAT) classification framework for acquiring comprehensive knowledge on multiple types of coexisting wireless systems. It is built upon the combination of a group of RAT-specific feature metrics using maximum likelihood estimation (MIE) based decision rules. The classification scheme is enhanced...
Conference Paper
In the EU FP7 ICT project ABSOLUTE, a novel network architecture based on the LTE-A aerial and terrestrial rapidly deployable eNodeB (RD-eNodeB) systems has been proposed for emergency communications in unexpected and temporary events. These systems would experience complex spectrum environment with multiple unknown coexisting cellular networks, wh...
Conference Paper
Full-text available
In this paper, we propose a robust spectrum sensing scheme which can reliably detect signals in multiple channels within short observation time at the cost of low computational complexity. The scheme consists of two parts. The first part is the signal detection algorithm essentially based on the crosscorrelation of the feature sequence generated ut...
Conference Paper
Full-text available
In this paper, we give an introductory presentation on the state of the art of the key technologies in the field of cognitive radio, including spectrum awareness, cognitive engine, location awareness, digital front-end and baseband spectral shaping. The technical feasibility of opportunistically operating the future evolution of long-term evolution...
Article
A random beamforming (RBF) technique is proposed to achieve omnidirectional coverage for broadcast channels in multiple-antenna systems. In the proposed scheme, the time and frequency resources for communication are divided into many time-frequency blocks (TFBs). A random pattern is employed on each TFB, with the average power in all directions ove...
Article
This paper presents our design of a long-term evolution advanced (LTE-A) system enhanced with cognitive radio (CR) technology. Introductions are given on the key components and functionalities such as spectrum awareness, cognitive engine, location awareness, digital front-end and baseband spectrum shaping. Besides, a research platform implementing...
Conference Paper
Full-text available
As of today, orthogonal frequency-division multiplexing (OFDM) has been the dominant technique in broadband transmission systems. However, for the application in cognitive radios, the sidelobes of rectangularly pulsed OFDM signals must be well suppressed to satisfy the rigorous spectral masks. In this context, filter-bank based multi-carrier (FBMC)...
Conference Paper
With the proliferation of radio services in the past decades, most of the spectrum available below 2GHz has been allocated, resulting in the spectrum scarcity problem. However, many studies have revealed that vast portions of the licensed spectra are rarely used. This triggered the concept of cognitive radio (CR) [1], [2], [3], where secondary user...
Conference Paper
Full-text available
In the context of cognitive radio, this paper proposes a simple spectral precoding for orthogonal frequency-division multiplexing (OFDM) to suppress its out-of-band radiation for a better adjacent-channel coexistence. Additionally, the proposed scheme is also aimed to improve the in-band subcarrier notching to efficiently utilize the fragmented spe...
Conference Paper
In this paper, a signal broadcasting scheme based on random beamforming is proposed to achieve omnidirectional coverage for public channels in multi-antenna cellular systems. Determining the basic weight vector achieving a pattern amplitude as flat as possible in the angular domain and forming a pair of complementary patterns on each time-frequency...
Patent
Full-text available
Embodiments of the present invention disclose a user pairing method, a device and a system for realizing user scheduling. The method comprises: determining a first user of a time-frequency resource according to a preset resource allocation criterion; searching a preset pairing table according to a downlink channel state quantization code of the fir...
Conference Paper
A random beamforming technique is proposed for broadcast channels in multiple antenna systems. In the proposed scheme, a random weight vector, corresponding to a random pattern, is imposed on each communication resource in timefrequency domain, with a resulting average of the random patterns on all resources to be isotropic. We proved that, the cap...
Conference Paper
The proliferation of IEEE 802.11 b WLAN (Wi-Fi), which occupies the 2.4-2.4835 GHz frequency bands, make the 2.4 GHz ISM unlicensed band more crowded. At the same time, the RFID technology emerged and will be widely deployed. RFID use diverse frequency bands from low frequency (LF) to microwave, including 2.4 GHz ISM bands too. Hence, when 2.45 GHz...
Article
IEEE 802.11b WLAN (Wi-Fi) and IEEE 802.15.1 WPAN (bluetooth) are prevalent nowadays, and radio frequency identification (RFID) is an emerging technology which has wider applications. 802.11b occupies unlicensed industrial, scientific and medical (ISM) band (2.4–2.483 5 GHz) and uses direct sequence spread spectrum (DSSS) to alleviate the narrow ban...