WO2004064302A2 - Hot standby access point - Google Patents
Hot standby access point Download PDFInfo
- Publication number
- WO2004064302A2 WO2004064302A2 PCT/US2004/000612 US2004000612W WO2004064302A2 WO 2004064302 A2 WO2004064302 A2 WO 2004064302A2 US 2004000612 W US2004000612 W US 2004000612W WO 2004064302 A2 WO2004064302 A2 WO 2004064302A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- active
- access points
- communication network
- wireless communication
- access point
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/04—Arrangements for maintaining operational condition
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
Definitions
- This invention is related in general to the field of wireless communications networks.
- the invention comprises a group of access points only one of which is active at any given time.
- Inactive back-up access points periodically test for the presence of an active access point. If an active access point is not found, the back-up access point will become active.
- the IEEE 802.11b specification allows for the wireless transmission of approximately 11 million bits per second of digital data at indoor distances up to a few hundred feet and outdoor distances up to tens of miles over a 2.4 gigahertz radio broadcast band.
- This broadcast band can be used for just about any type of digital communication.
- Transceivers referred to herein as access points are connected to mobile stations by the transmission and reception of radio signals.
- a mobile station transmits information to an AP.
- the AP can either broadcast the received information to other mobile stations or can pass the information to an attached network, such as an Ethernet local area network (“LAN”) .
- LAN Ethernet local area network
- mobile stations may communicate with other mobile stations that are connected through the wired LAN to another AP.
- APs are distributed according to the desired area of coverage. The area of effective transmission and reception depends on transmission strength, type of reception antennae and line-of-sight obstructions.
- redundant APs are placed within a coverage area forming a group. This group comprises an active primary AP and one or more inactive back-up APs. Should the primary AP fail or cease to communicate with the mobile stations in its area, one or more back-up APs become active .
- Another method for activating redundant APs is to have each AP in a coverage area continually transmit probe requests. These probe requests require responses from other APs and mobile stations connected to the communication network. The probing AP uses the responses to determine the status of the communication network. If an AP determines that the network does not include a primary access point, it then becomes active. However, this method of redundancy requires that all access points continually transmit probe requests and analyze responses from the communication network. This continuous probing reduces the bandwidth of the communication network by tying up transmission resources and creating collisions with other probe requests and data transmissions.
- backup APs it would be desirable to have a practical means for activating backup APs that does not require human intervention. Additionally, it would be desirable for backup APs to detect the failure of a primary AP without negatively impacting the data transmission bandwidth of the wireless communication network. Furthermore, if more than one backup AP is available in a group, it would be desirable for the backup APs to determine, between themselves, which AP will become the primary AP.
- One primary objective of this invention is a means for a back-up AP to detect when no other access point is operating as an active access point within its group or coverage area.
- Another objective of the invention is a means for a backup access point to become active and assume the role of the primary AP.
- Figure 1 is an illustration on the invention in a strip-mining environment.
- Figure 2 is a block diagram of the principle components of the invention.
- Figure 3 is a flow chart illustrating the process of detecting the failure of a primary AP, the activation of a back-up AP, and the resolution of contention between two or more back-up APs according to the invention.
- This invention is based on the idea of requiring that access points in a wireless communication network passively detect if other access points are active. By utilizing passive detection in a data transmission system, the adverse impact of transmitting probe signals and receiving response messages is reduced.
- Fig. 1 is an illustration of a wireless communication system 10 that includes mobile stations 12, primary APs 14, and backup APs 16 in a strip- mining environment.
- a group 18 is formed by combining a primary AP 14 with one or more backup APs 16 within a coverage area 20. Communication between the access points 14, 16 within a group and mobile stations 12 within the coverage area 20 occurs over a wireless communication system.
- Fig. 2 is a block diagram of a coverage area group 18, mobile stations 12, a primary AP 14, backup APs 16, and a communication channel 22.
- the communication channel 22 is a radio broadcast band utilizing the IEEE 802.11b standard for transmitting and receiving digital signals.
- the wireless communication system could be any system that transmits and receives either analog or digital information such as a telephone or satellite communication system.
- Access points 14,16 within a coverage area 20 are configured with similar network settings so that they appear as a common access point to mobile stations. This results in a coverage area being defined both as a geographical area and a specific set of communication addresses that are jointly recognized by the access points and mobile stations. Mobile stations that are not authorized to communicate with the access points, even if within the physical area serviced by the access points, are not within the coverage area 20.
- Separate coverage area groups 18 may be joined together to form an expanded coverage area. Bringing together disparate groups 18 may be accomplished by any of a plethora of combinations of wired and wireless communication networks. For example, a computer network such as a local area network or the Internet may join the groups 18. Similarly, a telephone communication system or a satellite transmission system could connect the groups.
- Primary APs are those that are responsible for managing the communication channel of the wireless network. Active access points are those that are either primary or attempting to become primary. Other access points are designated as backup APs 16, are inactive, and do not participate in the management of the communication channel .
- each access point could be given a priority number and only could become a primary AP if no other access points with a lower priority number are active.
- each access point becomes active when it is first powered on. Once active, it listens for activity from other access points. If other activity is detected, the access point that has just powered-on will implement a conflict resolution algorithm. If no activity is detected, the active access point will become the primary AP and will begin managing the communication channel.
- Both active and inactive access points listen for activity on the communication channel 22. Inactive access points listen to the communication channel to determine if they should become active. Inactive access points listen to determine if contention exists between themselves and other active access points.
- Fig. 3 is a flow-chart illustrating a conflict resolution algorithm 30, according to the preferred embodiment of the invention.
- an active access point transmits a beacon signal that notifies other access points that it is active and listens at step 34 for beacons from other access points within the coverage area group 18.
- each active access point Once another beacon has been detected at step 36, each active access point generates a random number representing a period of time 38. After waiting the prescribed amount of time 38, the access point again listens for other beacon signals 40. If no other access points continue to broadcast beacons, the remaining active access point becomes the primary access point.
- this access point enters standby mode at step 42 and becomes an inactive backup access point. Once inactive, the access point listens for beacons from other access points at step 44. If no other access points are broadcasting, this access point become active 32 and begins broadcasting beacons .
- active primary APs may be connected through other bridging APs that form a hierarchical wireless network rather than connecting APs through a wired LAN.
- the communication system could be formed from any of countless combination of wired and wireless communication components.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2004204953A AU2004204953B2 (en) | 2003-01-09 | 2004-01-09 | Hot standby access point |
CA002509877A CA2509877A1 (en) | 2003-01-09 | 2004-01-09 | Hot standby access point |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/339,050 US6934298B2 (en) | 2003-01-09 | 2003-01-09 | Hot standby access point |
US10/339,050 | 2003-01-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2004064302A2 true WO2004064302A2 (en) | 2004-07-29 |
WO2004064302A3 WO2004064302A3 (en) | 2004-11-04 |
Family
ID=32711028
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2004/000612 WO2004064302A2 (en) | 2003-01-09 | 2004-01-09 | Hot standby access point |
Country Status (5)
Country | Link |
---|---|
US (1) | US6934298B2 (en) |
AU (1) | AU2004204953B2 (en) |
CA (1) | CA2509877A1 (en) |
WO (1) | WO2004064302A2 (en) |
ZA (1) | ZA200505667B (en) |
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2003
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-
2004
- 2004-01-09 CA CA002509877A patent/CA2509877A1/en not_active Abandoned
- 2004-01-09 AU AU2004204953A patent/AU2004204953B2/en not_active Ceased
- 2004-01-09 WO PCT/US2004/000612 patent/WO2004064302A2/en active IP Right Grant
-
2005
- 2005-07-14 ZA ZA200505667A patent/ZA200505667B/en unknown
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Also Published As
Publication number | Publication date |
---|---|
AU2004204953B2 (en) | 2007-04-19 |
US20040136318A1 (en) | 2004-07-15 |
AU2004204953A1 (en) | 2004-07-29 |
US6934298B2 (en) | 2005-08-23 |
WO2004064302A3 (en) | 2004-11-04 |
CA2509877A1 (en) | 2004-07-29 |
ZA200505667B (en) | 2006-03-29 |
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