A compact dual band tree-type MIMO antenna for mobile wireless access network application

2013 ◽  
Author(s):  
Ching-Song Chuang ◽  
Wu-Tung Hsu ◽  
Lin Ming Chun
Keyword(s):  
Access Network ◽  
Wireless Access ◽  
Dual Band ◽  
Mobile Wireless ◽  
Mimo Antenna ◽  
Wireless Access Network ◽  
Network Application ◽  
Tree Type

scholarly journals Dynamic Bandwidth Management for TCP Flows in a Diffserv-Enabled Mobile Wireless Access Network

2021 ◽  
Author(s):  
Li Huang
Keyword(s):  
Access Network ◽  
Service Level ◽  
Wireless Access ◽  
Dynamic Adjustment ◽  
Bandwidth Utilization ◽  
Mobile Wireless ◽  
Wide Range ◽  
Wireless Access Network ◽  
Dynamic Bandwidth ◽  
The Impact

With the soaring demand to provide global mobility for wide range of services, a growing trend for wireless access networks is to support multiple radio technologies that can be achieved efficiently by using TCP/IP protocols in the access network. In the thesis, we consider a mobile wireless access network where DiffServ is deployed as the QoS solution and Mobile IP is employed as the handover protocol. We first conducted a study on the impact of handover on DiffServ flows. Then we introduced a transient service level for handover flows and propose our QoS scheme and admission control algorithms for handover flows, which protect local flows from losing bandwidth to handover flows by separating the two flows into different service classes. We also proposed a service upgrade algorithm to upgrade the service level of handover flows based on the dynamic information of bandwidth utilization and different service upgrade priorities. To guarantee the proper provisioning for each service class, we proposed a dynamic bandwidth-provisioning algorithm that allows dynamic adjustment of bandwidth allocations to different service classes by adjusting their respective weights configured at the scheduler. We evaluated the feasibility of our QoS scheme and algorithm by simulating different handover situations and results show that the proposed scheme is viable under variety of provisioning scenarios.

A Compact Dual-Band MIMO Antenna for WLAN Applications

2015 ◽  
Vol 764-765 ◽  
pp. 439-443
Author(s):  
Ching Song Chuang ◽  
Tsi Tsu Ku ◽  
Ming Chun Lin
Keyword(s):  
Wireless Lan ◽  
Mutual Coupling ◽  
Coupling Effect ◽  
Dual Band ◽  
Mobile Wireless ◽  
Mimo Antenna ◽  
Network Applications ◽  
Quarter Wavelength ◽  
Measurement Results ◽  
Tree Type

This paper presents a compact dual-band MIMO antenna that is compatible to the IEEE 802.11n wireless LAN standards. The MIMO antenna contains two tree-type elements placed back to back with distance of one-sixth wavelength of 2.4GHz; the element in the MIMO antenna is structured with a two-branch tree-type planar inverted-L monopoles, the lengths in both branches are set to the electrical quarter-wavelength of the frequency bands of 5.2GHz and 2.4GHz respectively. The MIMO antenna characterized by small size, low mutual coupling effect and nearly omni-directional coverage in radiation pattern make it entirely applicable to the mobile wireless network applications. The measurement results of the fabricated MIMO antenna demonstrate the success of the suggested design topologies.

scholarly journals Dynamic Bandwidth Management for TCP Flows in a Diffserv-Enabled Mobile Wireless Access Network

2021 ◽  
Author(s):  
Li Huang
Keyword(s):  
Access Network ◽  
Service Level ◽  
Wireless Access ◽  
Dynamic Adjustment ◽  
Bandwidth Utilization ◽  
Mobile Wireless ◽  
Wide Range ◽  
Wireless Access Network ◽  
Dynamic Bandwidth ◽  
The Impact

With the soaring demand to provide global mobility for wide range of services, a growing trend for wireless access networks is to support multiple radio technologies that can be achieved efficiently by using TCP/IP protocols in the access network. In the thesis, we consider a mobile wireless access network where DiffServ is deployed as the QoS solution and Mobile IP is employed as the handover protocol. We first conducted a study on the impact of handover on DiffServ flows. Then we introduced a transient service level for handover flows and propose our QoS scheme and admission control algorithms for handover flows, which protect local flows from losing bandwidth to handover flows by separating the two flows into different service classes. We also proposed a service upgrade algorithm to upgrade the service level of handover flows based on the dynamic information of bandwidth utilization and different service upgrade priorities. To guarantee the proper provisioning for each service class, we proposed a dynamic bandwidth-provisioning algorithm that allows dynamic adjustment of bandwidth allocations to different service classes by adjusting their respective weights configured at the scheduler. We evaluated the feasibility of our QoS scheme and algorithm by simulating different handover situations and results show that the proposed scheme is viable under variety of provisioning scenarios.

Performance Evaluation of Fiber Wireless (FiWi) Access Network using Position Optimization of ONUs

2020 ◽  
Vol 10 ◽  
Author(s):  
Nitin Chouhan ◽  
Uma Rathore Bhatt ◽  
Raksha Upadhyay
Keyword(s):  
Power Consumption ◽  
Optimization Algorithm ◽  
Optical Network ◽  
Access Network ◽  
Whale Optimization Algorithm ◽  
Wireless Access ◽  
Delivery Ratio ◽  
Packet Delivery ◽  
Whale Optimization ◽  
Wireless Access Network

: Fiber Wireless Access Network is the blend of passive optical network and wireless access network. This network provides higher capacity, better flexibility, more stability and improved reliability to the users at lower cost. Network component (such as Optical Network Unit (ONU)) placement is one of the major research issues which affects the network design, performance and cost. Considering all these concerns, we implement customized Whale Optimization Algorithm (WOA) for ONU placement. Initially whale optimization algorithm is applied to get optimized position of ONUs, which is followed by reduction of number of ONUs in the network. Reduction of ONUs is done such that with fewer number of ONUs all routers present in the network can communicate. In order to ensure the performance of the network we compute the network parameters such as Packet Delivery Ratio (PDR), Total Time for Delivering the Packets in the Network (TTDPN) and percentage reduction in power consumption for the proposed algorithm. The performance of the proposed work is compared with existing algorithms (deterministic and centrally placed ONUs with predefined hops) and has been analyzed through extensive simulation. The result shows that the proposed algorithm is superior to the other algorithms in terms of minimum required ONUs and reduced power consumption in the network with almost same packet delivery ratio and total time for delivering the packets in the network. Therefore, present work is suitable for developing cost-effective FiWi network with maintained network performance.

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