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Distributed pico-cell mobility

A mobile station, area technology, applied in the mobility enhancement of the IEEE802.11 MAC layer, the field of wireless radio access, and can solve the problem that the 802.11 mobility protocol is not suitable for cellular systems, etc.

Active Publication Date: 2007-12-12
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the typical range of IEEE802.11 systems is limited to 100m, whereby fast moving vehicles will pass through multiple cells in a very short time
[0004] 802.11 mobility protocols are not suitable for cellular systems configured for high mobility

Method used

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  • Distributed pico-cell mobility
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Examples

Experimental program
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Effect test

no. 1 example

[0024] In Fig. 1 a first embodiment of a network has been shown. The network comprises a plurality of access points AP3, AP4, AP5...AP6 connected to each other on a distributed system DS providing Internet access. According to the invention, the above access points form a pre-authentication area PAA, and the access points may advantageously define partially overlapping adjacent coverage, which may be arranged so as to be along roads or railways. An access point AP10, which is not part of the PAA area, may also be provided and connected to the distributed system. A system node MSYS may also be provided for authentication purposes according to the invention.

[0025] According to a first embodiment of the invention, the pre-authentication area PAA comprises a set of non-hierarchical access points, as shown in Fig. 1, but without MSYS nodes. Each access point forms a gateway towards the Internet. The access points are furthermore connected to each other by means of a distribut...

no. 2 example

[0034] In a second embodiment of the invention, the PA structure is hierarchical, meaning that a system node MSYS coupled to a BSS consisting of APs in a pre-authentication area provides access to the Internet. In Fig. 2, a second embodiment of a network according to the invention is provided. This network differs from the network shown in Figure 1 in that the system nodes are gateways to the Internet access network. FIG. 4 shows a timing diagram belonging to a second embodiment of the present invention.

[0035] In this embodiment, the MSYS task is to perform exclusive authentication of mobile stations entering the pre-authentication area or to provide additional authentication of mobile stations. If the authentication is passed for a given mobile station, access is provided for that mobile station.

[0036]In steps 21 and 22 respectively, the conventional steps of contacting the first encountered access point, in this case AP5, are done. Step 22 - the mobile station authe...

no. 3 example

[0043] This embodiment, similar to the one above, includes a gateway node controlling access to the Internet, as shown in FIG. 2 . Fig. 5 shows a timing diagram of a third embodiment of the present invention.

[0044] In this embodiment, there is no authentication before the access point of the pre-authentication area PAA.

[0045] After said association in step 32, in step 33 the mobile station authenticates with the gateway node MSYS. Messages are passed between associated access points and gateway nodes through a distributed system.

[0046] The mobile station then issues a group request message 34, signaling gateway nodes interested in being pre-authenticated for other access points in the pre-authentication area PAA. The mobile station may refrain from making the request if it is determined by upper layer procedures, for example as a result of the mobile station being stationary or moving in a local area that includes other access points that are not part of the pre-aut...

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PUM

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Abstract

System (PAA-BSS) comprising a plurality of access points (AP), defining a pre authentication area (PAA), the system communicating a list of frequencies relating to the access points of the pre-authentication area (PAA) and information as to the relative position of the access points to the a mobile station seeking pre-authentication before the system. Method of preparing a mobile station for handover between access points, wherein the mobile station associating (11, 21, 31) with a first access point in a prede termined group of access points (PAA-BSS) defining a pre-authentication area (PAA), the mobile station authenticating (12, 22, 32) itself before at least one prevalent access point of the group (PAA-BSS), upon being accepted for authentication before the prevalent, the mobile station receiving a response comprising a list of frequencies (14, 24, 34) pertaining to access points of the group (PAA-BSS).

Description

technical field [0001] The invention belongs to the technical field of wireless radio access for picocell systems. More specifically, the present invention relates to the field of mobility enhancements for the IEEE 802.11 MAC layer and systems and methods utilizing the latter. Background technique [0002] In recent years, the current standard for WLAN IEEE 802.11 has been successful in gaining widespread adoption among customers aiming to replace wired Ethernet LANs with wireless access. The currently adopted standard 802.11b uses the unlicensed frequency band of 2.4GHz. At the time of writing this application it is foreseen that if the current rate of adoption continues, the spectrum on the 2.4GHz band will soon be insufficient and there will be a migration to 5GHz and 802.11a. The 802.11a specification uses OFDM signaling at the PHY layer and uses higher PHY rates. The IEE802.11 MAC layer and MAC management are common to all PHY layers specified in 802.11. [0003] Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/22G06F13/00H04Q7/38H04L9/32H04W36/14
CPCH04W36/0072H04W36/14
Inventor G·里德内尔J·林德斯科格R·沃瑟
Owner TELEFON AB LM ERICSSON (PUBL)
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