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Method and apparatus for seamless roaming for wireless networks

A wireless network and network communication technology, applied in the field of seamless roaming, can solve problems such as unsuitable for continuous mobility

Active Publication Date: 2006-09-27
LUCENT TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Layer 2 mechanisms have limitations
However, Mobile IP and related mechanisms are well suited for nomadic connectivity, not for continuous mobility and the frequent handoffs between APs that can occur in 802.11 WLAN environments

Method used

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  • Method and apparatus for seamless roaming for wireless networks
  • Method and apparatus for seamless roaming for wireless networks
  • Method and apparatus for seamless roaming for wireless networks

Examples

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Embodiment Construction

[0025] Embodiments of the present invention include providing mobile units with roaming from one access point (AP) to another (AP on a different IP subnet) while maintaining at least their TCP connections and application sessions (e.g., HTTP sessions) , voice over IP session, etc.) capability method and device. According to an embodiment of the present invention, the device is capable of frequent mobile layer 3 handoffs between APs. The mobile unit is able to roam within the 802.11 wireless network without any modification using known operating systems such as Windows XP or Linux. Embodiments of the present invention are arranged so that no special kernel modules need to be loaded or application processes run on the mobile unit to support mobility.

[0026] Embodiments of the present invention include using a fixed virtual default router IP (IPvdv) address for all mobile units, using a fixed IP address for each active mobile unit, and managing Upon arrival of the frame, a ro...

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PUM

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Abstract

A method and apparatus for seamless roaming support for wireless networks is disclosed. The method includes broadcasting a request for a physical address of a default router related to a mobile unit; receiving the request at the default router; replying to the mobile unit; and creating an initial entry in a location table.

Description

technical field [0001] Embodiments of the present invention relate generally to wireless networks, and more particularly to seamless roaming between access points in different IP subnets in a wireless network. Background technique [0002] Due in part to the versatility and mobility of wireless devices (also referred to herein as "mobile units"), the use of such devices is becoming more common. In many practical applications, wireless devices communicate with each other using wireless networks. In order to communicate with hosts on a wired network (such as the Internet), wireless devices need to use, for example, IEEE 802.11 standard protocol wireless network (hereinafter referred to as "802.11 wireless network" or "802.11 WLAN") and a device called an access point (AP) Connect to a wireless local area network (WLAN). [0003] An AP or wireless access point (WAP) has an interface that connects wireless devices to a wired network, such as Ethernet. An AP may also include a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/38H04L12/56H04L29/06H04W8/08H04W8/26H04W36/18H04W40/24H04W84/12H04W88/08H04W88/14H04W92/02
CPCH04W36/18H04L29/12018H04L29/12113H04L29/12311H04L61/10H04L61/1541H04L61/2084H04W8/087H04W8/26H04W40/248H04W84/12H04W88/08H04W88/14H04W92/02H04L61/4541H04L61/5084
Inventor 林炯宪森约伊·保罗萨姆帕司·兰格拉珍
Owner LUCENT TECH INC