WO2009022901A2 - A method to maintain mobile ipv6 connectivity in mixed protocol access environment - Google Patents

A method to maintain mobile ipv6 connectivity in mixed protocol access environment Download PDF

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Publication number
WO2009022901A2
WO2009022901A2 PCT/MY2008/000082 MY2008000082W WO2009022901A2 WO 2009022901 A2 WO2009022901 A2 WO 2009022901A2 MY 2008000082 W MY2008000082 W MY 2008000082W WO 2009022901 A2 WO2009022901 A2 WO 2009022901A2
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WO
WIPO (PCT)
Prior art keywords
ipv6
present
connectivity
access environment
mobile ipv6
Prior art date
Application number
PCT/MY2008/000082
Other languages
French (fr)
Other versions
WO2009022901A3 (en
Inventor
Shariq Haseeb
Gopakumar K. K. Gopala
Mohamad Ahsan Chishti
Original Assignee
Mimos Berhad
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mimos Berhad filed Critical Mimos Berhad
Publication of WO2009022901A2 publication Critical patent/WO2009022901A2/en
Publication of WO2009022901A3 publication Critical patent/WO2009022901A3/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2101/00—Indexing scheme associated with group H04L61/00
    • H04L2101/60—Types of network addresses
    • H04L2101/618—Details of network addresses
    • H04L2101/659—Internet protocol version 6 [IPv6] addresses
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/04—Network layer protocols, e.g. mobile IP [Internet Protocol]
    • H04W80/045—Network layer protocols, e.g. mobile IP [Internet Protocol] involving different protocol versions, e.g. MIPv4 and MIPv6

Definitions

  • the present invention relates to a method of maintaining mobile connectivity in a mixed protocol access environment and more particularly the present invention relates to a method of maintaining mobile IPv6 connectivity when a mobile node moves from one point to another by preventing the mobile node from attaching to an IPv4 network.
  • a mobile node In current mixed protocol environment in which, multiple protocols are working or operating along side each other, it becomes difficult for applications running on one protocol to inter operate or communicate with other protocols. The situation becomes even more complex when two versions (IP version 4 and IP version 6) of the same protocol operate side by side.
  • IP version 4 and IP version 6 In mobile IPv6 operation, a mobile node (MN) needs to hop from one access point to another.
  • the access points might be either connected to an IPv4 or an IPv6 network. If a mobile IPv6 enabled MN moves into an IPv4 network, its mobility capabilities fail.
  • US 7,149,225 teaches a device which sits in a foreign network and is responsible to translate between IPv6 and IPv4 signaling.
  • the difference between the present invention is that, the present invention is designed to access an IPv4 network in a presence of v4/v6 connectivity rather than attempting to translate, therefore reducing the complexity of the protocol implementation.
  • US 7,031,328 teaches a creation of a tunnel from the mobile router to the destination for transferring IPv6 packets over IPv4.
  • the present invention relates to a method to maintain mobile IPv6 connectivity in mixed protocol access environment wherein the present method comprises of two stages and wherein in a first stage the method comprises of:-
  • the MN 1 when a MN 1 is switched on, the MN 1 would scan the surrounding area for a AP' s beacon from which it can determine the Extended Service Set Identifiers (ESSIDs), (b) Once the ESSIDs are found, the MN 1 would thereafter spoof the advertisement packets advertised by the said found APs. (c) By using the help of the advertisement packets in the found APs, the MNi would determine whether the AP is IPv6 enabled or otherwise. (d) When the AP is IPv6 enabled, the MNi would then add the ESSIDs
  • ESSIDs Extended Service Set Identifiers
  • the MNi performs repeats the above-mentioned steps regularly to build up its database of preferred ESSIDs.
  • the method includes wherein:
  • the MN 1 delays the connection and searches for another ESSID.
  • the method disallows the MN 1 form attaching itself to a non IPv6 enabled AP.
  • a mobile IPv6 enabled MN is configured to be intelligent enough to avoid other protocols.
  • the method is configured to restrict the mobility of the MN to be within the IPv6 domain.
  • the present invention is designed for mobility within an only IPv6 enabled network.
  • the present invention can also be used to move within an only IPv4 enabled network or to move between a selected list of APs.
  • Figure 1 shows a mobility scenario according to a prior art.
  • Figure 2 shows a flow chart diagram according to the present invention.
  • a mobile node hereinafter referred as MNi moves from AP 1 coverage area to another AP 3 coverage area, it could pass through any of the areas A, B, C or D.
  • the MN 1 has no intelligence to decide which Access Point (AP) to connect to, so it connects to the first AP it finds.
  • AP Access Point
  • the MN has already attached to a particular AP, it will not disconnect from it, until the AP goes down or the MN moves out of its coverage area.
  • MN 1 of Figure 1 moves from AP 1 coverage to AP 3 coverage area, it has to go through any of the areas A, B, C or D. Since MN 1 is already attached to AP 1 , as long as it remains in the area A or B, it will not attempt to detach from APi access.
  • MNi connects to AP 2
  • Mobile IPv6 stops functioning because AP 2 is working on IPv4. Since AP connectivity is sticky, MNi will not disconnect from AP 2 , as long as there is coverage of AP 2 .
  • the present invention could be described in two stages wherein in a first stage, the method includes wherein when the MNi is switched on, the MNi would scan the surrounding area for a APs beacon for Extended Service Set Identifiers (ESSIDs). Once the ESSIDs are found, the MNi would thereafter spoof the advertisement packets advertised the said found APs. By using the help of the advertisement packets in the found APs, the MNi would determine whether the AP is of IPv6 enabled or otherwise. If it is found that the AP is IPv6 enabled, the MN] would then add the ESSID to its priority list if the ESSID is not previously present in its list. It should be noted that the MN 1 repeats the above-mentioned steps regularly to build up its database of preferred ESSIDs.
  • ESSIDs Extended Service Set Identifiers
  • the method includes wherein when the MN 1 moves from the coverage area of AP 1 to AP 2 to AP 3 , its checks for any wireless connection availability in the area. Then, when a wireless connection is found, it checks the advertised ESSID with the ones present in its own list of preferred ESSIDs. If the advertised ESSID matches the ESSIDs in the preferred list, then the MN 1 connects to it and it can be sure that the connected AP is IPv6 enabled. If the advertised ESSID is not found in the preferred list of ESSIDs, then the MNi delays the connection and searches for another ESSID.
  • the MN 1 ensures mobility between IPv6 enabled environments and thus, avoids the IPv4 altogether.

Abstract

The present invention relates to a method of maintaining mobile connectivity in a mixed protocol access environment and more particularly the present invention relates to a method of maintaining mobile IPv6 connectivity when a mobile node moves from one point to another by preventing the mobile node from attaching to an IPv4 network. The present invention includes a method by which a mobile IPv6 enabled MN would become intelligent enough to avoid other protocols. The present invention is also designed to restrict the mobility of the MN to be within the IPv6 domain. The present invention provides a model for Internet Service Providers (ISPs) who are interested in deploying mobile IPv6 and who do not want interference from existing IPv4 infrastructure. The present invention is also designed for mobility within an only IPv6 enabled network or it can also be used to move within an only IPv4 enabled network or to move between a selected list of APs.

Description

A METHOD TO MAINTAIN MOBILE IPv6 CONNECTIVITY IN MIXED PROTOCOL ACCESS ENVIRONMENT
FIELD OF THE PRESENT INVENTION
The present invention relates to a method of maintaining mobile connectivity in a mixed protocol access environment and more particularly the present invention relates to a method of maintaining mobile IPv6 connectivity when a mobile node moves from one point to another by preventing the mobile node from attaching to an IPv4 network.
BACKGROUND OF THE INVENTION
In current mixed protocol environment in which, multiple protocols are working or operating along side each other, it becomes difficult for applications running on one protocol to inter operate or communicate with other protocols. The situation becomes even more complex when two versions (IP version 4 and IP version 6) of the same protocol operate side by side. In mobile IPv6 operation, a mobile node (MN) needs to hop from one access point to another. In a mixed protocol environment, the access points might be either connected to an IPv4 or an IPv6 network. If a mobile IPv6 enabled MN moves into an IPv4 network, its mobility capabilities fail.
Some literature that are relevant as prior art are discussed in brief as shown below:-
US 7,193,998 talks about a device that converts from IPv6 to IPv4. However, conversion can't be used in Mobile IPv6 because the signaling messages can't be encapsulated in an IPv4 packet.
US 7,072,339; US 6,985,485; US 6,928,077; US 6,920,138; US 6,920,137; US 6,920,136; US 6,690,669; US 6,118,784 and US 7,162,529 talks about a translating gateway between a Home Network and a Foreign Network. This will allow the nodes in the network to talk across different protocol schemes. These inventions also require a setup of 2 separate infrastructures and does not solve the interconnectivity between IPv4 and IPv6. It rather explains how to interoperate between IPv4 and IPv6. Mapping of an IPv6 global address in to a IPv4 local address is not possible therefore interconnectivity is not possible.
US 6,862,274 discuss the problem of address mapping between IPv6 and IPv4. However the difference between the present invention and this US patent is that, the present invention prevents access to a v4 network in a presence of v4/v6 connectivity. Therefore it reduces the complexity of the protocol implementation. Further more, the present invention allows a preferred network selection rather than a random network selection.
US 7,149,225 teaches a device which sits in a foreign network and is responsible to translate between IPv6 and IPv4 signaling. The difference between the present invention is that, the present invention is designed to access an IPv4 network in a presence of v4/v6 connectivity rather than attempting to translate, therefore reducing the complexity of the protocol implementation.
US 7,031,328 teaches a creation of a tunnel from the mobile router to the destination for transferring IPv6 packets over IPv4.
It is an objective of the present invention to overcome the above-mentioned problem by proposing a method by which a mobile IPv6 enabled MN would become intelligent enough to avoid other protocols. It is also another objective of the present invention to restrict the mobility of the MN to be within the IPv6 domain.
It is yet another objective of the present invention to provide a model for Internet Service Providers (ISPs) who are interested in deploying mobile IPv6 and who do not want interference from existing IPv4 infrastructure. Therefore, the present invention is designed for mobility within an only IPv6 enabled network. The present invention can also be used to move within an only IPv4 enabled network or to move between a selected list of APs. SUMMARY OF THE PRESENT INVENTION
The present invention relates to a method to maintain mobile IPv6 connectivity in mixed protocol access environment wherein the present method comprises of two stages and wherein in a first stage the method comprises of:-
(a) when a MN1 is switched on, the MN1 would scan the surrounding area for a AP' s beacon from which it can determine the Extended Service Set Identifiers (ESSIDs), (b) Once the ESSIDs are found, the MN1 would thereafter spoof the advertisement packets advertised by the said found APs. (c) By using the help of the advertisement packets in the found APs, the MNi would determine whether the AP is IPv6 enabled or otherwise. (d) When the AP is IPv6 enabled, the MNi would then add the
ESSID to its priority list if the ESSID is not previously present in its list, (e) The MNi performs repeats the above-mentioned steps regularly to build up its database of preferred ESSIDs.
In a second stage, the method includes wherein:
(a) when the MNi moves from the coverage area of APi to AP2 to AP3, its checks for any wireless connection availability in the area.
(b) Then, when a wireless connection is found, it checks the advertised ESSED with the ones present in its own list of preferred ESSEDs.
(c) If the advertised ESSED matches the ESSIDs in the preferred list, then the MN1 connects to it and it can be sure that the connected
AP is IPv6 enabled. (d) If the advertised ESSID is not found in the preferred list of
ESSIDs, then the MN1 delays the connection and searches for another ESSID.
The method disallows the MN1 form attaching itself to a non IPv6 enabled AP.
A mobile IPv6 enabled MN is configured to be intelligent enough to avoid other protocols. The method is configured to restrict the mobility of the MN to be within the IPv6 domain. The present invention is designed for mobility within an only IPv6 enabled network. The present invention can also be used to move within an only IPv4 enabled network or to move between a selected list of APs.
BRIEF DESCRIPTION OF THE FIGURES
Figure 1 shows a mobility scenario according to a prior art.
Figure 2 shows a flow chart diagram according to the present invention.
DETAILED DESCRIPTION OF THE PRESENT INVENTION
The present invention would be described with reference made to the accompanied figures but not limited thereto.
The present invention will be described in two parts. Firstly we will highlight the problem that persists in the current system and the solutions to that problem will be explained.
With reference first made to Figure 1, in the current system, when a mobile node hereinafter referred as MNi moves from AP1 coverage area to another AP3 coverage area, it could pass through any of the areas A, B, C or D. In the current implementation, the MN1 has no intelligence to decide which Access Point (AP) to connect to, so it connects to the first AP it finds. Prior to explaining the problem, one must understand that a AP selection is based on first come first serve basis, therefore, the AP whose beacon advertisement reaches the MN first, will become the preferred AP. On the same note, if the MN has already attached to a particular AP, it will not disconnect from it, until the AP goes down or the MN moves out of its coverage area.
When MN1 of Figure 1 moves from AP1 coverage to AP3 coverage area, it has to go through any of the areas A, B, C or D. Since MN1 is already attached to AP1, as long as it remains in the area A or B, it will not attempt to detach from APi access.
The problem arises when the MNi moves into the area C or D for a short period of time before proceeding to the coverage of AP3. Only AP2 covers the area C and both AP2 and AP3 cover the area D. When in area C or D, the MN1 can randomly choose the AP coverage depending on whose advertisement reaches the MNi first. If the MNi chooses to attach to AP3, the Mobile IPv6 components will function normally because AP3 is running on an IPv6 network.
However, if the MNi connects to AP2, Mobile IPv6 stops functioning because AP2 is working on IPv4. Since AP connectivity is sticky, MNi will not disconnect from AP2, as long as there is coverage of AP2.
The invention described in this document, solves the problems by simply disallowing the MNi of Figure 1 form attaching to a non IPv6 enabled AP. This can be achieved by following the steps of Figure 2.
The present invention could be described in two stages wherein in a first stage, the method includes wherein when the MNi is switched on, the MNi would scan the surrounding area for a APs beacon for Extended Service Set Identifiers (ESSIDs). Once the ESSIDs are found, the MNi would thereafter spoof the advertisement packets advertised the said found APs. By using the help of the advertisement packets in the found APs, the MNi would determine whether the AP is of IPv6 enabled or otherwise. If it is found that the AP is IPv6 enabled, the MN] would then add the ESSID to its priority list if the ESSID is not previously present in its list. It should be noted that the MN1 repeats the above-mentioned steps regularly to build up its database of preferred ESSIDs.
In stage two, the method includes wherein when the MN1 moves from the coverage area of AP1 to AP2 to AP3, its checks for any wireless connection availability in the area. Then, when a wireless connection is found, it checks the advertised ESSID with the ones present in its own list of preferred ESSIDs. If the advertised ESSID matches the ESSIDs in the preferred list, then the MN1 connects to it and it can be sure that the connected AP is IPv6 enabled. If the advertised ESSID is not found in the preferred list of ESSIDs, then the MNi delays the connection and searches for another ESSID.
It is notices that by applying the methods as described in the above-mentioned stages, the MN1 ensures mobility between IPv6 enabled environments and thus, avoids the IPv4 altogether.

Claims

1. A method to maintain mobile IPv6 connectivity in mixed protocol access environment characterized in that wherein the present method comprises of two stages and wherein in a first stage the method comprises of:-
(a) when a MN1 is switched on, the MN1 would scan the surrounding areas for a AP' s beacon for Extended Service Set Identifiers (ESSIDs), (b) Once the ESSIDs are found, the MN1 would thereafter spoof the advertisement packets advertised the said found APs. (c) By using the help of the advertisement packets in the found APs, the MN1 would determine whether the AP is of IPv6 enabled or otherwise. (d) When the AP is IPv6 enabled, the MN1 would then add the
ESSID to its priority list if the ESSID is not previously present in its list, (e) The MN1 repeats the above-mentioned steps regularly to build up its database of preferred ESSIDs.
2. A method to maintain mobile IPv6 connectivity in mixed protocol access environment as claimed in Claim 1 wherein in a second stage, the method includes wherein:
(a) when the MN1 moves from the coverage area of APi to AP2 to
AP3, its checks for any wireless connection availability in the area.
(b) Then, when a wireless connection is found, it checks the advertised ESSID with the ones present in its own list of preferred ESSEDs. (c) If the advertised ESSID matches the ESSIDs in the preferred list, then the MN1 connects to it and it can be sure that the connected AP is IPv6 enabled.
(d) If the advertised ESSID is not found in the preferred list of ESSIDs, then the MN1 delays the connection and searches for another ESSID.
3. A method to maintain mobile IPv6 connectivity in mixed protocol access environment as claimed in Claims 1 and 2 wherein the method disallows the MN1 form attaching itself to a non IPv6 enabled AP.
4. A method to maintain mobile IPv6 connectivity in mixed protocol access environment as claimed in Claims 1 and 2 wherein mobile IPv6 enabled MN is configured to be intelligent enough to avoid other protocols.
5. A method to maintain mobile IPv6 connectivity in mixed protocol access environment as claimed in Claims 1 and 2 wherein the method is configured to restrict the mobility of the MN to be within the IPv6 domain.
6. A method to maintain mobile IPv6 connectivity in mixed protocol access environment as claimed in Claims 1 and 2 wherein the present invention is designed for mobility within an only IPv6 enabled network.
7. A method to maintain mobile IPv6 connectivity in mixed protocol access environment as claimed in Claims 1 and 2 wherein the present invention can also be used to move within an only IPv4 enabled network or to move between a selected list of APs.
PCT/MY2008/000082 2007-08-15 2008-08-14 A method to maintain mobile ipv6 connectivity in mixed protocol access environment WO2009022901A2 (en)

Applications Claiming Priority (2)

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MYPI20071351A MY146667A (en) 2007-08-15 2007-08-15 A method to maintain mobile ipv6 connectivity in mixed protocol access environment
MYPI20071351 2007-08-15

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050037325A (en) * 2003-10-18 2005-04-21 삼성전자주식회사 System and method for hand-off of mobile ip terminal in wireless network
US20050163080A1 (en) * 2003-10-18 2005-07-28 Samsung Electronics Co., Ltd. System and method for providing handover of a mobile IP terminal in a wireless network
US20050243772A1 (en) * 2004-04-28 2005-11-03 Samsung Electronics Co. Ltd. Handover supporting method and apparatus and handover method and apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050037325A (en) * 2003-10-18 2005-04-21 삼성전자주식회사 System and method for hand-off of mobile ip terminal in wireless network
US20050163080A1 (en) * 2003-10-18 2005-07-28 Samsung Electronics Co., Ltd. System and method for providing handover of a mobile IP terminal in a wireless network
US20050243772A1 (en) * 2004-04-28 2005-11-03 Samsung Electronics Co. Ltd. Handover supporting method and apparatus and handover method and apparatus

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WO2009022901A3 (en) 2009-04-09
MY146667A (en) 2012-09-14

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