Adaptive vertical handoff method based on UMTS (universal mobile telecommunications system) and WLAN (wireless local area network)

A vertical switching and self-adaptive technology, applied in electrical components, wireless communication, etc.

Active Publication Date: 2013-04-03
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Several decision measurement methods based on RSS: relative RSS, relative RSS plus threshold, relative RSS plus hysteresis margin, relative RSS plus hysteresis margin plus threshold, prediction technology, etc.; although there have been many researches on the method of vertical switching, the above research Fixed Threshold Method

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  • Adaptive vertical handoff method based on UMTS (universal mobile telecommunications system) and WLAN (wireless local area network)
  • Adaptive vertical handoff method based on UMTS (universal mobile telecommunications system) and WLAN (wireless local area network)
  • Adaptive vertical handoff method based on UMTS (universal mobile telecommunications system) and WLAN (wireless local area network)

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Embodiment Construction

[0045] An adaptive vertical handover method based on UMTS and WLAN described in the present invention, in order to describe the present invention in more detail, is illustrated below with reference to the accompanying drawings. Such as figure 1In the topological model shown, the UMTS network access point is the base station BS, the WLAN network access point is the AP respectively, and the mobile station moves into and out of the WLAN at a constant speed. The operation process of the method embodiment is as follows image 3 As shown, it includes the process of moving the mobile station into the WLAN and the process of moving the mobile station out of the WLAN; the processes are respectively:

[0046] 1) During the process of moving the mobile station into the WLAN, when the mobile station (MN) enters the overlapping coverage area of ​​the WLAN and UMTS networks, it can determine whether to access if it detects that the WLAN is available. Two factors need to be considered when...

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Abstract

The invention provides an adaptive vertical handoff method based on a UMTS (universal mobile telecommunications system) and a WLAN (wireless local area network). The adaptive vertical handoff method includes the process of moving a mobile station into the WLAN and the process of moving the mobile station out of the WLAN. In the process of moving the mobile station into the WLAN, compensation time is calculated, an adaptive speed threshold is further solved, handoff decision is more accurately and reasonably made, and ping-pong effects and handoff interrupt probability are effectively reduced. In the process of moving the mobile station out of the WLAN, an adaptive RSS (really simple syndication) threshold is solved according to connection interrupt probability which can be tolerated by users, the connection interrupt probability can be effectively reduced, and connection interrupt and WLAN utilization rate can be compromised according to business needs. The method is quite simple and easy to implement, and has an excellent application prospect.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and specifically refers to an adaptive vertical switching method based on UMTS and WLAN. Background technique [0002] With the rapid development of wireless networks and communication technologies, different types of wireless network systems have emerged, including WiMAX, WMAN, WiFi, UMTS, and WLAN. WLAN can provide high bandwidth but limited coverage, while cellular network can provide wide area access but low access rate, so WLAN such as IEEE802.11 can be used to provide high bandwidth and UMTS to provide large coverage. As the development trend of next-generation networks, heterogeneous network convergence is the integration of the advantages of different networks to obtain the most satisfactory QoS. Among them, the research of vertical switching is challenging and attracts more and more attention. Vertical handover includes network discovery, handover decision-making and hando...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W36/14H04W36/30
Inventor 张晖金玲杨龙祥朱洪波
Owner NANJING UNIV OF POSTS & TELECOMM
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