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Each UE can aggregate multiple component carriers (CCs) as a wider band to support the demand of higher data rates in LTE-Advanced (LTE-A) systems with carrier aggregation (CA). An appropriate CC selection is necessary in order to improve the utility of CA, since not all CCs benefit from CA due to bad channel quality of some CCs. Most of existing methods only take one aspect of problems into account...
Energy consumption in mobile networks, e.g. 3G networks, may be a substantial part of an operator's expenses. A large part of the total energy of the network is consumed by the radio access network. Today operators are saving energy by turning off carriers or cells during periods with low traffic by manually configuring on-off periods. At the same time, operators are seeking to increase cost efficiency...
In this paper we use game theory to analyze Slotted ALOHA when integrating erasure coding, from the perspective of a selfish user. We construct a ALOHA game model and examine the optimal behavior of individual users. We confirm the existence of Nash equilibrium, and then we compare our results with those found in conventional model. By the use of game theory assumption, we have been able to improve...
Channel selection is one of important issues in Cognitive Radio (CR) networks and it is closely related to the channel characteristics and primary user's behavior. In this paper, we proposed a modified proportional fairness scheduling which not only consider the fairness and the throughput but also take the primary user characteristics of each channel into account.
Devices in wireless mesh networks are often supplied with limited power resources, while also running complex applications with high energy requirements, such as high quality video deliveries over the network. Reducing energy consumption is a key factor when designing a solution for such scenarios. Some existing energy-aware video delivery solutions have been proposed for sensor networks, but they...
Existing low-power MAC protocols only provide low throughput because of the fixed low duty-cycle. This often leads to poor performance when dealing with time-constrained burst traffic. In this paper, we propose a new hybrid CSMA/TDMA MAC protocol, called Queue-MAC, that dynamically adapts the duty-cycle according to the current network traffic. The queue length of nodes is used as the network traffic...
The thermal problem of three-dimensional Network-on-Chip (3D NoC) is severer than 2D NoC because chip stacking. To keep the temperature below a certain thermal limit, the near-overheat routers are throttled and the 3D topology becomes Non-Stationary Irregular Mesh (NSI-Mesh). To ensure the successful packet delivery in the NSI-Mesh, Transport Layer Assisted Routing (TLAR) scheme was proposed. It has...
Multi Radio Multi Channel Wireless Mesh Networks (MRMC-WMNs) are undergoing rapid progress and inspiring numerous deployments. These networks require carefully assignment of resources and load balancing to provide the quality guarantees to traffic flows. Load balancing avoids the creation of bottlenecks and increases the network efficiency. Certainly, we need a benchmark to compare the performance...
At present, although the IEEE 802.11 MAC and PHY specifications provide multi-channel and multi-rate capabilities, exploiting data rates and available orthogonal channels is still a crucial issue to ensure high network performance in wireless mesh networks (WMNs). Most channel assignment schemes for WMNs assume that all links operate at an identical data rate; i.e., they ignore the existence of multi-rate...
EDCA is a contention-based channel access scheme defined in the IEEE 802.11e standard and it can ensure quality of multimedia services. In this paper, we propose a new enhanced EDCA scheme called Hybrid-Measure EDCA(HM-EDCA), which dynamically adjust the important parameters-contention window(CW) size according to both of network condition and traffic state of traffic categories at each node. Network...
High packet network have become an essential in modern multimedia communication. Shared buffer is commonly used to utilize the buffer in the switch. In this paper, we analyse the performance of shared buffer with different memory sizes. The architecture of the multi-class shared buffer is developed for 16×16 ports switch that is targeted in Xilinx FPGA. The performance of the multi-class shared buffer...
Microsoft's Receive-side scaling (RSS) is a network driver layer technology that enables the efficient distribution of received packets. However, Microsoft's RSS technology is implemented in hardware. In this paper, we implement RSS technology in user-space and apply it in a traffic monitoring system which runs on the DELL R710 multi-core server. We distribute received packets, according to certain...
In this paper, we present an Multi-Dimensional Learning multiple access control scheme for cognitive radio users in unlicensed spectrum. The proposed scheme is developed by applying reinforcement learning to the perspectives of both channel assignment and retransmission policy based upon a multichannel p-persistent CSMA algorithm. In a distributed open spectrum sharing situation, decisions regarding...
In this paper, simulations of downlink Long Term Evolution (LTE) system network capacities were performed. The existing WCDMA network is used as reference for LTE radio network design: locations, antenna directions / types / tilts / heights. Simulation is performed for uniform and non-uniform network traffic distribution as well as for case with inter-cell interference coordination.
The properties of underwater acoustic channel are quite different from those of terrestrial wireless sensor networks, which brings many challenges to design an efficient media access control (MAC) protocol for underwater acoustic sensor networks (UWASNs). In order to overcome the long propagation delay and the funneling effect of UWASNs, a MAC protocol, named path-oriented code assignment (POCA) CDMA...
A Module Matched First Dispatching (MMFD) algorithm for MSM Clos-network switches is proposed in this paper. Each output port of input modules and central modules has its own state pointer. At the beginning of each time slot, schedulers configure the state of each central module according to the value of each pointer. And then, cells switched in next time slot are selected on the basis of the configuration...
Carrier Aggregation (CA) is one of the important technologies to further improve the capacity of Long Term Evolution Advanced (LTE-A). When CA is conducted, a User Equipment (UE) will firstly select a Primary Serving Cell (PCell) for mobility support and then add Secondary Serving Cells (SCell) for higher experienced data rate. When and how to add/remove SCell is a very important issue, especially...
We describe here a new burst scheduling algorithm to avoid burst overlapping in the egress router of optical burst switching (OBS) network, and hence to improve the quality of service (QoS) in developing several optical networks to fulfill the increasing demand of Internet facilities. We consider TAG (tell-and-go) protocol where many lightpaths pass in a given link and burst overlap may occur. In...
Qos provision is considered as the complex task due to the heterogeneous nature, diverse QoS requirements of emergent different applications. With the advent of high bandwidth 3G/4G technologies, like LTE, LTE-advanced, the necessity of QoS provision becomes even crucial. Uplink scheduling with QoS provision is considered here. The contribution of this work is uplink packet scheduling scheme maintaining...
In order to reduce the reception completion time of data units in the application layer, a novel TCP-oriented multi-layer packet scheduler (TCP-oriented MLPS) is proposed in this paper. The proposed scheduler firstly narrows down the number of candidate users of the packet scheduler based on the congestion window in the TCP layer, and then allocates resources to the selected candidate users preferentially...
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