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This paper addresses the issue of packet scheduling with spatial division multiplexing (SDM) techniques of multiple input multiple output (MIMO) antenna in the 3GPP Long Term Evolution (LTE) downlink. Considering the restricted condition of selecting SDM techniques, a novel packet scheduling algorithm with quality of service (QoS) support in LTE downlink MIMO system, named QoS-DMO, is proposed. QoS-DMO...
As a fundamental network property, Inter-Contact Time (ICT) determines the critical performance metrics of a vehicular ad-hoc network (VANET). In this paper, we extract the contact information from the traces of Global Positioning System (GPS) from public and semi-public vehicles in a large modern city, including both buses and taxis. By exploring the spatial and temporal properties of the contact...
This paper proposes a novel edge router architecture for the 3-Level Integrated Hybrid Optical Network (3LIHON). The detailed implementations of the queue scheduling techniques, assembly algorithm, and the contention resolution mechanism are presented. We also build a network simulator to evaluate the performance of the architecture with different realistic input traffic patterns. Results show that...
Next-generation passive optical network (PON) has been widely considered as a cost-effective broadband access technology. With the ever-increasing power saving concern, energy efficiency has been an important issue for its operations. In this paper, we present a novel sleep time sizing and scheduling framework that satisfies power efficient bandwidth allocation in PONs. We consider the downstream...
In a two-way wireless relay network, two nodes communicate with each other through a relay, and throughput is enhanced by the relay transmitting a linear combination of the messages received from the two sources either at the bit level (digital network coding) or the signal level (analog network coding). In this paper, we solve for the fraction of time resources allocated to each transmission mode...
Carrier aggregation (CA) has been proposed as a key feature of the 4G cellular networks to achieve the very high data rates. It is known that the correlation between the subchannels, including both small- and large-scale fading, is critical in determining the performance gain we can obtain from the multicarrier transmission. However, due to the prohibitively high complexity and cost in simultaneously...
As the number of processing elements which can be placed on a single chip doubles about every two years, both System-on-Chip (SoC) and the microprocessor market call for high-performance, flexible, scalable, and design-friendly interconnection network architectures [1]. Network-on-Chip (NoC) has been proposed as a solution to multi-core communication problems. The advantages of NoC include high bandwidth,...
The IEEE 802.11 standard based Wireless Local Area Networks (WLANs) are widely deployed and have gained greater popularity. It is anticipated that WLAN will play an important rule in the future wireless communication systems in order to provide several gigabits data rate. However, it has been a challenging problem to support the IEEE 802.11 WLAN devices to fully exploit the high throughput gains offered...
Scalable multicast protocol design based on the Bloom filter has received much attention from the research community recently. With the Bloom filter-based design, routing information is carried by the multicast data packet in the format of a Bloom filter. As the network node has no need maintaining a forwarding state for each group it is supporting, the Bloom filter-based multicast protocols are more...
The bundle protocol (BP) is developed to solve the new problems in deep space exploration. To date, little work has been done in evaluating the performance of BP applied to an interplanetary Internet involving frequent link disruptions. This paper builds a PC-based Deep Space Communication Test-bed. It consists of three parts, the space link simulator, the high-speed Ethernet switch and the Linux-based...
This paper investigates performance tradeoffs between energy and information transfer in a relay based two-hop wireless system involving an energy harvesting receiver. The source and relay nodes of the two-hop amplify-and-forward (AF) system employ orthogonal space-time block codes along with orthogonal frequency-division multiplexing (OFDM) scheme. The joint optimal source and relay precoders over...
The existing energy saving algorithms are implemented only with one kind of Passive Optical Network (PON). However, as far as Ethernet PON (EPON), good performances can not be reached simultaneously in both 10G-EPON and 1G-EPON. 10G-EPON can provide higher throughput and lower delay than 1G-EPON, but it consumes more energy. Therefore, to obtain trade-off performances, we propose a new Energy Saving...
In wireless mesh networks that are built using IEEE 802.11 techniques, there are significant problems in maintaining fairness and low delay to provide QoS for long-hop flows. To address these issues, express forwarding has been proposed. However, existing studies of express forwarding are simulation based, and the main benefits that have been demonstrated are limited to shortened delay for long-hop...
Multimedia sensor network (MSN) has been deployed in many fields owing to its reliability, flexibility and availability of multimedia data. Correspondingly more challenges draw into the QoS guarantee research. In this paper, we establish a comprehensive performance analytical framework for MSN considering both the traffic self-similarity and stochastic service curve of MSN with S-MAC protocol based...
The lacking of a thorough understanding on the capacity in mobile ad hoc networks (MANETs) has been stunting their applications in the last decade. Available capacity studies focus on exploring either the order sense capacity scaling laws, the closed-form capacity under some specific routing protocols, or the exact capacity without careful consideration of wireless interference issue in MANETs. In...
This paper considers multiuser cooperative relay networks with user selection at the mobile station, where both the relay and mobile users are corrupted by a finite number of co-channel interferers. We study the impact of the outdated channel state information (CSI) on the system performances over time-varying Rayleigh fading channels by deriving the tight lower bounds for the outage probability and...
Geographically distributed data centers for the rapid growth of worldwide cloud service bring the demand of massive inter-data center information exchange. Considering the capacity and costs, existing optical networks show their advantages to carry the non-interactive, delay tolerated and bulk inter-data center data. In order not to affect the real-time traffic, these bulk data is usually transferred...
There are kinds of Internet applications such as VoIP, online gaming and video Conferencing which need quality of service guarantees making the performance analysis critical, and the traffic of such applications usually exhibits the properties of self-similarity and heavy tail. In this paper, we use the generalized Stochastically Bounded Burstiness model to characterize the network traffic with self-similar...
This paper proposed a routing protocol integrating both the characteristic of the flooding-based protocol and forwarding-based protocol. The basic idea of our protocol is to let message be forwarded to the nodes moving toward or closer to destination. When nodes contact with each other, our approach will utilize the path of the node, node's moving direction and velocity to estimate the probability...
In this paper we propose an algorithm to achieve hard delay constraints in OFDMA systems. The resource scheduler has to ensure that delay deadlines of the packets get achieved and the resources are also not under utilized. This is a very difficult task since the channel and packet arrival in user queues are time varying in nature. The instantaneous decisions of scheduler depend on current as well...
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