Handoff in Wireless Mobile Networks

Zeng, Qing-An; Agrawal, Dharma P.

doi:10.1002/0471224561.ch1

Cited by 48 publications

(27 citation statements)

References 16 publications

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“…Due to these signal fluctuation several handover occurs while BTS1 receive signal strength is still sufficient to serve the mobile station. These unnecessary handover can lead to the ping-pong effect in which the mobile station is repeatedly passed between two BTS [44].…”

Section: Handover Initiationmentioning

confidence: 99%

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Cellular Handover approaches in 2.5G to 5G Technology

Khan¹,

Abbas²,

khan³

2011

IJCA

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The obstruction in cellular network involves the problem when a mobile user travels from one cell to another during a call. As adjacent cell do not use the same radio channels, a call must be transferred from one radio channel to another when a user crosses the line between the adjacent cells. The process of handover takes place that transfer an ongoing call from one cell to another cell as the user moves through the coverage area of a cellular network. There are several different reasons needed to be known to determine whether a handover is required. The signal strength of the base station, along signal strengths of the surrounding stations as in addition the availability of the channels also needed to be known. The mobile monitors the strength of the base stations in cellular network to know for the status of channel availability and the network make decision about the handover. The main goal of this research is to investigate the handover research issues and developing schemes which can handle handovers traffic in order to support on-going calls when mobile users are switching between base stations. The final outcomes of the research will theoretical and mathematical approaches to convince the users as possible to provide effective methods for evaluating handover mechanisms as well as cellular network performance.

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Section: Handover Initiationmentioning

confidence: 99%

“…Then it is clear form the Markov chain that ί one-dimensional. The blow figure shows the sate transition diagram of the cells [44].…”

Section: International Journal Of Computer Applications (0975 -8887) mentioning

confidence: 99%

Cellular Handover approaches in 2.5G to 5G Technology

Khan¹,

Abbas²,

khan³

2011

IJCA

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“…Then it is clear form the Markov chain that ί one-dimensional. The blow figure shows the sate transition diagram of the cells [33].…”

Section: Figure 17 Priority Queue System Model For Handover Callmentioning

confidence: 99%

“…Then the steady state probability is found as follow according to the Markov chain Where Therefore the blocking probability Bo for an originating call is and termination probability of the call is In the FIFO handover Prioritization scheme the probability of the forced termination is decreased however the handover call may be dropped because the handover request can only wait until the receiver threshold is reached [33].…”

Section: Figure 18 State Transition Diagrammentioning

confidence: 99%

Handover management in GSM cellular system

Khan¹

2010

IJCA

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Handover mechanism is extremely important in cellular network because of the cellular architecture employed to maximize spectrum utilization. Handover is the procedure that transfers an ongoing call from one cell to another as the user's moves through the coverage area of cellular system. One way to improve the cellular network performance is to use efficient handover prioritization schemes when user is switching between the cells. In this paper I have presented an analytical framework that can enhance considerably the handover call mechanism in wireless network. Some advance schemes namely, guard channels, call admission control and handover queuing are discussed. All these of prioritiztaions schemes have a common characteristic reducing the call dropping probability at the expense of increased call blocking probability. Efficnet prioritiztaion scheme accomadetes a number of new calls while guaranates the quality of sevice(QOS) of hanover call. This idea is based on the neighbouring cells have an ovelapping (the area served by more than one cell) coverage area. Furthermore cell overlap and load balancing scheme is proposed to enhance the GSM cellular capacity using an overlapping coverage area. Capacity enhancement is achieved by balancing the load in neighboring cells.

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“…본 논문에서는 무선 수동형 센서 망에서 패킷의 상실(loss)에는 비교적 관대하지만 패킷의 적시(timely) 전달을 요구하는 서비스를 제공하기 위한 MAC 방식으로 framed and slotted ALOHA [5] 에 기초한 경합형 MAC 방식을 고려한다. 다음 지리적으로 흩어져있는 센서 노드들이 전송한 패킷들이 경로 손실(path loss)를 겪고 마침내 capture 현상 [6] [7] .…”

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Optimal Design of Contending-type MAC Scheme for Wireless Passive Sensor Networks

Choi¹,

Seo²

2016

Journal of the Institute of Electronics and Information Enginee

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A wireless passive sensor network is a network which, by letting separate RF sources supply energy to sensor nodes, is able to live an eternal life without batteries. Against expectations about an eternal life, however, a wireless passive sensor network still has many problems; scarcity of energy, non-simultaneity of energy reception and data transmission and inefficiency in resource allocation. In this paper, we focus on a wireless passive sensor network providing a packet service which is tolerable to packet losses but requires timely delivery of packets. Perceiving the practical constraints, we then consider a contending-type MAC scheme, rooted in framed and slotted ALOHA, for supporting many sensor nodes to deliver packets to a sink node. Next, we investigate the network-wide throughput achieved by the MAC scheme when the packets transmitted by geographically scattered sensor nodes experience path losses hence capture phenomena. Especially, we derive an exact formula of network-wide throughput in a closed form when 2 sensor nodes reside in the network. By controlling design parameters, we finally optimize the contending-type MAC scheme as to attain the maximum network -wide throughput.Keywords : wireless passive sensor network, MAC, framed and slotted ALOHA, capture, throughput

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Handoff in Wireless Mobile Networks

Cited by 48 publications

References 16 publications

Cellular Handover approaches in 2.5G to 5G Technology

Cellular Handover approaches in 2.5G to 5G Technology

Handover management in GSM cellular system

Optimal Design of Contending-type MAC Scheme for Wireless Passive Sensor Networks

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