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Adaptive resource allocation is studied for OFDMA-based cooperative cellular networks. Assuming that the base station has all the channel state information (CSI), an optimization problem for adaptive subcarrier assignment, power allocation and relay selection scheme that maximizes downlink capacity of the system is formulated. Since the optimal solution is computationally complex to obtain, a suboptimal...
This paper presents the architecture and function model of cooperative radio resource management (Co-RRM) for the efficient integration of different radio access technologies. Also it proposes the different implementation schemes of Co-RRM in the multi-radio access network architecture. In addition, it introduces a policy-based radio resource allocation algorithm for Co-RRM entity to maximize the...
Uplink subcarrier and power allocation is studied for OFDMA relay-assisted cellular network. Assuming that the base station has all the channel state information (CSI), an optimization problem for an adaptive subcarrier and power allocation scheme that maximizes system capacity while guaranteeing minimum resources for each user with constraint of overall transmission power is formulated. Since the...
Providing end-to-end quality of service (QoS) guarantees in all-IP Networks is a challenging task that encompasses a set of multiple administrative domains. But from the existing proposed architecture point of view, mature solutions are not yet available for the provision of QoS across multiple domains administered by different organizations, especially under the FMC circumstance. So based on the...
Based on an appropriate hierarchical mobile IP network model, the quantitative analysis has been deeply investigated about relations between handoff latency and hierarchical mobile IP size of regional networks. Moreover, hierarchical mobile IP optimal size of regional network is obtained through adopting a minimum iterative function. The numerical simulation results show that related research achievements...
A scheme is proposed for adaptive antenna pattern switch in WiMAX (world interoperability for microwave access) system. In the scheme, the decision for switching is made according to the minimum acceptable signal-to-noise ratio. It enables the WiMAX system to switch adoptively between the multi-antenna pattern and the single antenna pattern. And then a proper tradeoff could be achieved between the...
The mobile IP can provide continuous Internet access services for the mobile user and does provide a simple and scalable solution to user mobility. Yet, mobile IP is not a good solution for users with high mobility because it may cause excessive signaling traffic and long latency. The hierarchical mobile IP (HMIP) protocol was proposed to employ the hierarchy of foreign agents (FAs) and the gateway...
Wireless mesh networks (WMNs) suffer from random variations in channel condition. This leads to poor performance in multi-hop wireless mesh networks specially with a conventional routing. To cope with instability of wireless links, new routing metrics must be explored. In this paper we propose a new end-to-end Bit Error Rate (BER) aware metric for multi-hop wireless routing and take hop number into...
This paper proposes a suite of customer centric quantitative analysis method aiming at evaluating service performance in new generation telecommunication service system. Firstly, bidirectional modelling approach is put forward to define the extracting process of information parameters related to service quality and hierarchical service quality evaluation model is established. Secondly, Analytic Hierarchy...
Based on the new concept which is called the Equivalent Minimum Acceptable Carrier-to-Interference Ratio(EMACIR), a new method is proposed to analyze the capacity of the multi-service cellular systems with MIMO multiple input multiple output). Conveniently, the method can predict the outage capacity of the multi-service cellular system after deploying multiple antennas based on the parameters which...
Following a brief overview of the research of “Mobile Service Test Platform”-MSTP- supported by “211 project” of China whose objective is to study Next Generation Network technologies, an analysis of the 3GPP IP Multimedia Subsystem (IMS) function is provided. Then an introduction of implementing IMS on Network Simulator 2 is given based on MSTP. Finally, we describe the scenario of subscribers communication...
Multi-rate mechanism is adopted widely in wireless communication systems, such as WiFi mesh networks. Most of routing protocols which are employed in Ad Hoc networks use minimum hop-count as a performance metric to select the routing path, such as AODV, DSR, etc. These routing protocols are not effective in WiFi mesh networks. Rate aware routing protocol based on AODV (R-AODV) uses minimum network...
This paper proposes home network, which is extension of broad band network to home and an important composing part of NGN, and home gateway, which is the core of home network. The paper analyzes architecture of universal home gateway from hardware and software architecture. Functions of universal home gateway are analyzed and researched deeply from five sides, which include access function, interconnect...
The random access procedure of 2G and 3G mobile communication system are derived from slotted ALOHA. This paper analyzes the performance of slotted ALOHA at first, and then proves the results by simulation of the access procedure. This article proposes that the higher-power access packets would be attempted to detect after the base station detecting a collision, and analyzes the performance of this...
It is widely anticipated that beyond 3G network will be an IP-based integration of heterogeneous wireless access technologies. "Seamless mobility" in such network is much more difficult to be achieved than in traditional wireless telecommunication networks because the B3G network environments are more complex, and various IP-based services presents various QoS requirements, and single handover...
In order to reduce the handover latency to support the real-time application, Layer 2 trigger was proposed to help Layer 3 handover. However, the current Layer 2 trigger mechanism has two major problems. One is that Layer 2 trigger has non-unified interface with upper layer. And the other is that single parameter based trigger is not efficient to provide accurate information in heterogeneous network...
Horizontal layered reference architecture of the third generation mobile network is presented in this paper. The work flow of location service is analyzed based on the architecture. The scenario of new location service mobility-ATM is described in it. Finally, an application of the service is designed and implemented to show how to develop 3G service in service layer of the architecture
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