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For the most existing MAODV protocol is only improved by a single performance, there is a problem that the comprehensive performance of the protocol cannot be improved as well. By uses of the routing selection mechanism with the constraints of bandwidth, delay and packet loss rate of the original protocol, a new multi-objective routing protocol RCQ-MAODV of mobile ad hoc network is put forward. Simulations...
The delay and bandwidth are the two most fundamental factors in the network. In the delay and bandwidth constrained circumstances, we present a problem of maximizing the number of nodes and then prove the problem is NP-complete. Next, we propose a comprehensive evaluation of delay and bandwidth heuristic algorithm. According to the heuristic algorithm, distributed application layer multicast algorithms...
The steadily growing deployment of resilience-critical Internet services is leading to an increasing number of Multi-Homed network sites. Asymmetric Digital Subscriber Lines (ADSL) are an inexpensive way to add a secondary Internet access connection. With the development of Multi-Path Transport Layer protocols - like Multipath TCP (MPTCP) and the Stream Control Transmission Protocol (SCTP) furnished...
Overlay multicast is an effective approach to the problem of streaming distribution. Other approaches proposed for streaming, i.e., unicast transmission and IP multicast have several drawbacks. The former method is not scalable with the growing number of users. The latter method - IP multicast - requires strong cooperation with ISPs (Internet Service Providers) what is not always realizable due to...
Next Generation Network (NGN) is a packet based network which can support the expansion of broadband and introduction of triple play (Voice +Data +Video) over fixed and mobile line. Before deployment of NGN, the capacity and Quality of Service (QoS) over NGN must be ensured. In this paper, the technologies proposed by Huawei have been applied to ensure the capacity and QoS over NGN. Then the optimized...
Surface acoustic wave (SAW) radio frequency identification (RFID) has its advantages over IC based RFID, but it has difficulties to possess the code capacity large enough for most practical applications. In this paper, a novel and effective encoding method is presented, which enables one to fabricate a tag with code capacity 3.5×107 within a chip length of 8 mm, and a corresponding optimal way to...
Wireless sensor networks (WSNs) should handle multiple sensing tasks for various applications. How to improve the quality of the data acquired in such resource constrained environment is a challenging issue. In this paper, we propose a sensor-channel co-allocation model for scheduling the sensing tasks. The proposed model considers the capability, coupling and load balancing constraints for sensing...
Application-Layer Multicast (ALM) is considered a viable solution for compensating the lack of global IP Multicast deployment. While early ALM approaches consider only stationary end-systems, their use becomes more and more feasible on smaller devices like laptops and mobiles. Many ALM protocols have been proposed that employ multi-metric optimization strategies to consider e.g. delays, fanout-degrees,...
When a content provider (CP) provides peer-to-peer live streaming service, routing decisions based on the knowledge of underlay traffic could lead to much better performance (such as user delay). On the other hand, if the Internet Service Providers (ISPs) provide underlay traffic information to the CP, their overall network cost due to routing inefficiencies could be reduced. There is hence incentive...
In this paper we discuss the viability of utility-based abstractions for network management. These can be used for estimation and optimization of the network performance. We consider utilities that are determined by the application type, but also take into account changing user and provider context. These metrics incorporate technical performance characteristics, economic and personal considerations...
Signal controlled intersection is critical to the urban traffic network, signal timing optimization is important to reduce traffic delays, relieve congestion, and improve the operation of urban traffic network. This study proposed a phase sequence optimization model for coordination control based on NEMA phase. After establishing the experimental network, VISSIM was adopted for testifying the effectiveness...
To improve the adaptability and stability of Dijkstra algorithm for solving routing problem of service composition, a method to solve routing problem of service composition based on an improved ant colony algorithm is proposed. Firstly, based on the traditional ant colony algorithm, the constraints of it are improved. Secondly, a problem solving model for improved ant colony algorithm is established,...
The advantage and weakness of mobile agent migration strategy have an important impact on user's task that the agent completes. The agent flooding mechanism is proposed to collect network status information duly, and a new kind of traveling agent is included into the mobile agent system to improve the real-time performance, and self-adaptation ant colony algorithm is used to search the path, and improves...
In 3G cellular networks, the release of radio resources is controlled by inactivity timers. However, the timeout value itself, also known as the tail time, can last up to 15 seconds due to the necessity of trading off resource utilization efficiency for low management overhead and good stability, thus wasting considerable amount of radio resources and battery energy at user handsets. In this paper,...
Unlike traditional routing schemes that route all traffic along a single path, multipath routing strategies split the traffic among several paths in order to ease congestion. It has been widely recognized that multipath routing can be fundamentally more efficient than the traditional approach of routing along single paths. aiming at the increasing network traffic and the deficity that the former Ant...
The WiMAX channel access is controlled by one of the several available Medium Access Control (MAC) procedures. This paper studies the contention-based bandwidth request procedure based on our original analytical model, facilitated by numerical analysis and simulation. We optimize the key parameters of the contention procedure in order to minimize the average bandwidth access delay, thus ensuring the...
Resilient Packet Ring (RPR) is the metropolitan area network (MAN) architecture of based on optimization of packet service, its ring fabric is the part of register insert ring. Register insert ring has the characteristics of time-division multiplexing and space-division multiplexing, and the schedule of ring fabric is simple. It is suitable for fabric of switch. The article uses register insert ring...
The diverse types of service beared on the large-scale IP network makes bandwidth allocation a research focus. This paper proposes a dynamic and fine-grained bandwidth allocation method which is suitable for large-scale network. We extends Norros' Fractional Brownian Motion (FBM) model to make it fit for the allocation of service bandwidth in IP network. Through identifying and analyzing different...
With the presentation of more reliable groupcast proposal for IEEE802.11 WLAN, the QoS of video transmission based on groupcast (multicast / broadcast) is improved. To adapt the network load and bandwidth dynamic change in WLAN environment, we design a flexible optimization mechanism that integrates video steam priority character with more reliable groupcast technology. Simulation validates it is...
QoS-aware network planning becomes increasingly important for network operators and ISP alike as the number and heterogeneity of applications supported by networks continue to increase. We have proposed an architecture and methodology to support QoS-aware route planning for IPTV networks. The route planning problem was formulated as a residual bandwidth optimization problem and solved using GA-VNS...
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