David Chieng | University of Nottingham, China Campus (original) (raw)
Papers by David Chieng
The paper presents a monitoring system for carrier grade mesh networks. First, the system archite... more The paper presents a monitoring system for carrier grade mesh networks. First, the system architecture, components and interfaces are described. Then the measured and discovered network parameters are discussed. A link prediction and trigger algorithm based on a modified meanreverting diffusion process is proposed. The results from analysis show that this function can significantly enhance link reliability.
— Current Internet use is evolving, users are becoming mobile and are expecting data services on ... more — Current Internet use is evolving, users are becoming mobile and are expecting data services on the go. This fact presents big challenges and opportunities to operators, which see the increase in data services as a big market still to be exploited. However, current cellular technologies cannot accommodate the demand that will arise when the true Mobile Internet evolves. Addressing these challenges, we present the CARMEN project, the vision of which is to extend operators ’ infrastructure by providing carrier grade services through a heterogeneous wireless mesh. The CARMEN architecture will provide enough bandwidth to cope with users ’ expectations at a reduced cost, thereby generating major benefits to operators and users. I.
Research Journal of Applied Sciences, Engineering and Technology, 2013
Transactions on Emerging Telecommunications Technologies, 2016
Wireless heterogeneous network (HetNet) with small cells presents a new backhauling challenge tha... more Wireless heterogeneous network (HetNet) with small cells presents a new backhauling challenge that differs from those of experienced by conventional macro‐cells. In practice, the choice of backhaul technology for these small cells whether fibre, xDSL, point‐to‐point and point‐to‐multipoint wireless, or multi‐hop/mesh networks, is often governed by availability and cost and not by required capacity. Therefore, the resulting backhaul capacity of the small cells in HetNet is likely to be non‐uniform because of the mixture of backhaul technologies adopted. In such an environment, a question then arises whether a network selection strategy that considers the small cells' backhaul capacity will improve the end users' usage experience. In this paper, a novel dynamic backhaul capacity sensitive (DyBaCS) network selection scheme is proposed and compared with two commonly used network selection schemes, namely, WiFi First and physical data rate in an LTE‐WiFi HetNet environment. The p...
2010 INFOCOM IEEE Conference on Computer Communications Workshops, 2010
2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), 2013
Wireless Communications and Applications (ICWCA 2012), IET International Conference on, 2012
2013 IEEE 11th Malaysia International Conference on Communications (MICC), 2013
![Research paper thumbnail of Extremely dense wireless networks [Guest Editorial]](https://attachments.academia-assets.com/119365703/thumbnails/1.jpg)
](IEEE Communications Magazine, 2015
2008 IEEE 19th International Symposium on Personal, Indoor and Mobile Radio Communications, 2008
![Research paper thumbnail of Supporting carrier grade services over wireless mesh networks: The approach of the European FP-7 STREP CARMEN [Very Large Projects]](https://attachments.academia-assets.com/119365715/thumbnails/1.jpg)
](IEEE Communications Magazine, 2009
The paper presents a monitoring system for carrier grade mesh networks. First, the system archite... more The paper presents a monitoring system for carrier grade mesh networks. First, the system architecture, components and interfaces are described. Then the measured and discovered network parameters are discussed. A link prediction and trigger algorithm based on a modified meanreverting diffusion process is proposed. The results from analysis show that this function can significantly enhance link reliability.
Proceedings of ICT Mobile Summit, Santander, USA, Jul 1, 2009
Providing carrier grade services to a large number of mobile users is becoming an important chall... more Providing carrier grade services to a large number of mobile users is becoming an important challenge for wireless network operators. One promising solution for offering cost-efficient alternatives compared to classical cellular approaches is the use of wireless mesh networks along with the use of heterogeneous radio technologies. In this paper we propose a MAC abstraction layer to lessen the management burden of heterogeneous radio technologies. This abstraction layer is intended to hide the complexity and specifics of different wireless ...
We propose a Joint Measurement-based Admission and Bandwidth Control (JMABC) QoS provisioning sch... more We propose a Joint Measurement-based Admission and Bandwidth Control (JMABC) QoS provisioning scheme for real-time applications over Distributed Coordination Function (DCF) WLANs. JMABC offers a clean improvement on top of the existing WLANs as it combines the underlying DCF with layer-3 control mechanisms. The JMABC's control mechanisms come in two folds: 1) Active traffic flows are protected from the newly admitted flows through a measurement-based admission control policy and 2) The admitted real-time traffic flows are prioritized over the best-effort traffic through a packets scheduling scheme. Extensive simulation studies on throughput, packets delay, and jitter performances show that the proposed JMABC scheme can effectively enhance the performance of real-time applications over legacy DCF WLAN systems.
The performance of Wireless Asynchronous Transfer Mode (W ATM) networks is influenced by both cel... more The performance of Wireless Asynchronous Transfer Mode (W ATM) networks is influenced by both cell level and call level issues. These can introduce delay and loss into the services that use the W ATM Access Points (APs). At the cell or burst levels, buffering and schemes in the APs, and the instantaneous load applied to the radiocells can have an impact on the Quality of Sevice (QoS) off erred. At the call level, the number of calls blocked at setup or handoff contributes to the Grade of Service (GoS) offered. The GoS and QoS must be considered together when assessing the performance of multimedia services in a W A TM network. A novel modelling approach is presented here, whereby an integrated call level-cell level model allows realistic traffic patterns to be generated and applied at both levels. This approach permits analysis of a WATM AP architecture in terms of delay (at the cell level), and blocked calls (at the call level). Results presented show the performance of different buffering techniques in the W A TM APs. Additionally, call level performance parameters allow the GoS offered to clients in the radio picocells to be adjusted across a range of traffic classes in order to optimise the QoS for time-sensitive applications.
SSRN Electronic Journal
The ultra-dense network (UDN) is considered a vital technology for 5G mobile communications due t... more The ultra-dense network (UDN) is considered a vital technology for 5G mobile communications due to its ability to transmit high data rates in high-traffic environments. However, it also creates new challenges, such as increased interference and difficulty managing mobility. To ensure seamless base station connectivity and maintain a high quality of service, a reliable handover algorithm is necessary, especially in a UDN where the cell size is small. This paper proposes an optimisation method for handover parameters based on the Deep Deterministic Policy Gradient (DDPG) algorithm. It adjusts the handover margin (HOM) to determine the handover trigger points accurately and dynamically. Simulation results indicate that the system's mobility performance has been greatly improved while maintaining high throughput and low latency at different speeds.
Journal of High Speed Networks, 2004
The paper presents a monitoring system for carrier grade mesh networks. First, the system archite... more The paper presents a monitoring system for carrier grade mesh networks. First, the system architecture, components and interfaces are described. Then the measured and discovered network parameters are discussed. A link prediction and trigger algorithm based on a modified meanreverting diffusion process is proposed. The results from analysis show that this function can significantly enhance link reliability.
— Current Internet use is evolving, users are becoming mobile and are expecting data services on ... more — Current Internet use is evolving, users are becoming mobile and are expecting data services on the go. This fact presents big challenges and opportunities to operators, which see the increase in data services as a big market still to be exploited. However, current cellular technologies cannot accommodate the demand that will arise when the true Mobile Internet evolves. Addressing these challenges, we present the CARMEN project, the vision of which is to extend operators ’ infrastructure by providing carrier grade services through a heterogeneous wireless mesh. The CARMEN architecture will provide enough bandwidth to cope with users ’ expectations at a reduced cost, thereby generating major benefits to operators and users. I.
Research Journal of Applied Sciences, Engineering and Technology, 2013
Transactions on Emerging Telecommunications Technologies, 2016
Wireless heterogeneous network (HetNet) with small cells presents a new backhauling challenge tha... more Wireless heterogeneous network (HetNet) with small cells presents a new backhauling challenge that differs from those of experienced by conventional macro‐cells. In practice, the choice of backhaul technology for these small cells whether fibre, xDSL, point‐to‐point and point‐to‐multipoint wireless, or multi‐hop/mesh networks, is often governed by availability and cost and not by required capacity. Therefore, the resulting backhaul capacity of the small cells in HetNet is likely to be non‐uniform because of the mixture of backhaul technologies adopted. In such an environment, a question then arises whether a network selection strategy that considers the small cells' backhaul capacity will improve the end users' usage experience. In this paper, a novel dynamic backhaul capacity sensitive (DyBaCS) network selection scheme is proposed and compared with two commonly used network selection schemes, namely, WiFi First and physical data rate in an LTE‐WiFi HetNet environment. The p...
2010 INFOCOM IEEE Conference on Computer Communications Workshops, 2010
2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), 2013
Wireless Communications and Applications (ICWCA 2012), IET International Conference on, 2012
2013 IEEE 11th Malaysia International Conference on Communications (MICC), 2013
IEEE Communications Magazine, 2015
2008 IEEE 19th International Symposium on Personal, Indoor and Mobile Radio Communications, 2008
IEEE Communications Magazine, 2009
The paper presents a monitoring system for carrier grade mesh networks. First, the system archite... more The paper presents a monitoring system for carrier grade mesh networks. First, the system architecture, components and interfaces are described. Then the measured and discovered network parameters are discussed. A link prediction and trigger algorithm based on a modified meanreverting diffusion process is proposed. The results from analysis show that this function can significantly enhance link reliability.
Proceedings of ICT Mobile Summit, Santander, USA, Jul 1, 2009
Providing carrier grade services to a large number of mobile users is becoming an important chall... more Providing carrier grade services to a large number of mobile users is becoming an important challenge for wireless network operators. One promising solution for offering cost-efficient alternatives compared to classical cellular approaches is the use of wireless mesh networks along with the use of heterogeneous radio technologies. In this paper we propose a MAC abstraction layer to lessen the management burden of heterogeneous radio technologies. This abstraction layer is intended to hide the complexity and specifics of different wireless ...
We propose a Joint Measurement-based Admission and Bandwidth Control (JMABC) QoS provisioning sch... more We propose a Joint Measurement-based Admission and Bandwidth Control (JMABC) QoS provisioning scheme for real-time applications over Distributed Coordination Function (DCF) WLANs. JMABC offers a clean improvement on top of the existing WLANs as it combines the underlying DCF with layer-3 control mechanisms. The JMABC's control mechanisms come in two folds: 1) Active traffic flows are protected from the newly admitted flows through a measurement-based admission control policy and 2) The admitted real-time traffic flows are prioritized over the best-effort traffic through a packets scheduling scheme. Extensive simulation studies on throughput, packets delay, and jitter performances show that the proposed JMABC scheme can effectively enhance the performance of real-time applications over legacy DCF WLAN systems.
The performance of Wireless Asynchronous Transfer Mode (W ATM) networks is influenced by both cel... more The performance of Wireless Asynchronous Transfer Mode (W ATM) networks is influenced by both cell level and call level issues. These can introduce delay and loss into the services that use the W ATM Access Points (APs). At the cell or burst levels, buffering and schemes in the APs, and the instantaneous load applied to the radiocells can have an impact on the Quality of Sevice (QoS) off erred. At the call level, the number of calls blocked at setup or handoff contributes to the Grade of Service (GoS) offered. The GoS and QoS must be considered together when assessing the performance of multimedia services in a W A TM network. A novel modelling approach is presented here, whereby an integrated call level-cell level model allows realistic traffic patterns to be generated and applied at both levels. This approach permits analysis of a WATM AP architecture in terms of delay (at the cell level), and blocked calls (at the call level). Results presented show the performance of different buffering techniques in the W A TM APs. Additionally, call level performance parameters allow the GoS offered to clients in the radio picocells to be adjusted across a range of traffic classes in order to optimise the QoS for time-sensitive applications.
SSRN Electronic Journal
The ultra-dense network (UDN) is considered a vital technology for 5G mobile communications due t... more The ultra-dense network (UDN) is considered a vital technology for 5G mobile communications due to its ability to transmit high data rates in high-traffic environments. However, it also creates new challenges, such as increased interference and difficulty managing mobility. To ensure seamless base station connectivity and maintain a high quality of service, a reliable handover algorithm is necessary, especially in a UDN where the cell size is small. This paper proposes an optimisation method for handover parameters based on the Deep Deterministic Policy Gradient (DDPG) algorithm. It adjusts the handover margin (HOM) to determine the handover trigger points accurately and dynamically. Simulation results indicate that the system's mobility performance has been greatly improved while maintaining high throughput and low latency at different speeds.
Journal of High Speed Networks, 2004