Wireless network management with antenna control

• US 7,738,877 B2
• Filed: 07/19/2004
• Issued: 06/15/2010
• Est. Priority Date: 07/19/2004
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Amos, James A.
• Primary Examiner(s): Patel; Ajit
• Assistant Examiner(s): NGUYEN, KHAI MINH
• Application Number:
  US10/894,245
• Publication Number:
  US 20060023648A1
• Time in Patent Office: 2,157 Days
• Field of Search: 455/13.3, 455/13.4, 455/25, 455/19, 455/127.1, 455/127.2, 455/129, 455/454, 455/450, 455/456.1, 370/338, 370/328, 370/310
• US Class Current: 455/454
• CPC Class Codes: G01R 29/0878 Sensors; antennas; probes; detectors wave guide measuring sections G01R1/24
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: H04B 17/102 Power radiated at antenna

Abstract

A method and apparatus for managing a wireless local area network are disclosed. The network includes one or more wireless access points, each including a radio frequency assembly having a variable power output, and an antenna assembly for transmitting and receiving wireless signals. A microcontroller is included for sending a transmission characteristics signal to the wireless local area network. A network manager is included for receiving the transmission characteristics signal and selectively controlling the variable power output of the radio frequency assembly to a predetermined power level.

Claims

1. A method of network management, comprising:

polling a first wireless access point of a plurality of wireless access points to acquire transmission characteristics;

receiving transmission characteristics for the first wireless access point in response to the poll, the transmission characteristics comprising data representative of transmit power;

receiving data representative of received signal strength of a signal sent from the first wireless access point received by a second of the plurality of wireless access points;

determining a path loss based on the data representative of transmit power and data representative of signal strength; and

varying the output power for the first of the plurality of access points based on the data representative of transmit power and path loss so as to establish a predetermined coverage area;

receiving transmission characteristics including data representative of transmit power for each of the plurality of access points;

receiving data representative of received signal strength for each of the plurality of wireless access points;

determining a path loss for each of the wireless access points based on data representative of transmit power and data representative of received signal strength; and

adjusting the output power of each the plurality of wireless access points based on the data representative of transmit power and path loss to establish predetermined coverage areas.

2. The method of network management of claim 1, further comprising calculating path loss for each of the plurality of wireless access points based on antenna characteristics determined from the transmission characteristics.

3. The method of network management of claim 1, wherein the transmission characteristics include at least one of predetermined antenna gain, a measured output power, an operational frequency band, and an identifying characteristic of a respective antenna assembly.

4. The method of network management of claim 3, wherein the identifying characteristic is at least one of a product model number, a part number, a revision number, a serial number, and a manufacturing date.

5. The method of network management of claim 1, further comprising remotely detecting the transmission power of an antenna associated with the access point.

6. The method of network management of claim 1, further comprising selectively adjusting the output power of the access point to achieve a desired power level.

7. The method of network management of claim 1, further comprising detecting antenna orientation.

8. The method of network management of claim 1, wherein the transmission characteristics include antenna type and the antenna type is one of the group consisting of dipole, omni, patch, array, Yagi, and parabolic dish.

9. The method of network management of claim 1, further comprising selecting an operational band determined by reading a memory associated with an antenna assembly and updating the memory in accordance with the selection.

10. The method of network management of claim 9, wherein the operational band is one of the group consisting of 2.4 and 5 Gigahertz.

11. The method of network management of claim 1, further comprising at least one of reading an analog voltage and setting an analog voltage.

12. The method of network management of claim 1, further comprising shutting down the access point if a non-compliant antenna is detected.

13. The method of network management of claim 1, further comprising determining a minimum power level for the plurality of access points to provide adequate coverage.

14. A computer-readable medium having instructions stored thereon that, when executed by a processor, to instructions for managing a network, comprising:

means for polling a first wireless access point of a plurality of wireless access points to acquire transmission characteristics;

means for receiving transmission characteristics for the first wireless access point in response to the poll, the transmission characteristics comprising data representative of transmit power;

means for receiving data representative of received signal strength of a signal sent from the first wireless access point received by a second of the plurality of wireless access points;

means for determining a path loss based on the data representative of transmit power and data representative of signal strength; and

means for varying the output power for the first of the plurality of access points based on the data representative of transmit power and path loss so as to establish a predetermined coverage area for each of the plurality of access points

means for receiving transmission characteristics including data representative of transmit power for each of the plurality of access points;

receiving data representative of received signal strength for each of the plurality of wireless access points;

means for determining a path loss for each of the wireless access points based on data representative of transmit power and data representative of received signal strength; and

means for adjusting the output power of each the plurality of wireless access points based on the data representative of transmit power and path loss to establish predetermined coverage areas.

15. The computer-readable medium of instructions for managing a network of claim 14, further comprising means for calculating path loss for each of the plurality of wireless access points based on antenna characteristics determined from the transmission characteristics.

16. The computer-readable medium of instructions for managing a network of claim 14, wherein the transmission characteristics include at least one of predetermined antenna gain, a measured output power, an operational frequency band, and an identifying characteristic of a respective antenna assembly.

17. The computer-readable medium of instructions for managing a network of claim 16, wherein the identifying characteristic is at least one of a product model number, a part number, a revision number, a serial number, and a manufacturing date.

18. The computer-readable medium of instructions for managing a network of claim 14, further comprising means for remotely detecting the transmission power of an antenna associated with the access point.

19. The computer-readable medium of instructions for managing a network of claim 14, further comprising means for selectively adjusting the output power of the access point to achieve a desired power level.

20. The computer-readable medium of instructions for managing a network of claim 14, further comprising means for detecting antenna orientation.

21. The computer-readable medium of instructions for managing a network of claim 14, wherein the transmission characteristics include antenna type and the antenna type is one of the group consisting of dipole, omni, patch, array, Yagi, and parabolic dish.

22. The computer-readable medium of instructions for managing a network of claim 14, further comprising means for selecting an operational band determined by reading a memory associated with an antenna assembly and means for updating the memory in accordance with the selection.

23. The computer-readable medium of instructions for managing a network of claim 22, wherein the operational band is one of the group consisting of 2.4 and 5 Gigahertz.

24. The computer-readable medium of instructions for managing a network of claim 14, further comprising means for at least one of reading an analog voltage and setting an analog voltage.

25. An apparatus, comprising:

a network manager operable to communicate with a plurality of wireless access points;

the network manager is operable to poll a first wireless access point of the plurality of wireless access points to acquire transmission characteristics, the first wireless access point having a coverage area;

the network manager is operable to receive transmission characteristics for the first wireless access point in response to the poll, the transmission characteristics comprising data representative of transmit power;

the network manager is operable to receive data representative of received signal strength of a signal sent from the first wireless access point received by a second of the plurality of wireless access points;

the network manager is operable to determine a path loss based on the data representative of transmit power and data representative of signal strength; and

the network manager is operable to vary the output power for the first of the plurality of access points based on the data representative of transmit power and path loss so that the first wireless access point has a suitable amount of power to establish the coverage area

the network manager is configured to receive transmission characteristics including data representative of transmit power for each of the plurality of access points, wherein each of the plurality of wireless access points has a corresponding coverage area;

the network manager is configured to receive data representative of received signal strength for each of the plurality of wireless access points;

the network manager is operable to determine a oath loss for each of the wireless access points based on data representative of transmit power and data representative of received signal strength; and

the network manager is operable to adjust the output power of each the plurality of wireless access points based on the data representative of transmit power and oath loss to establish the corresponding coverage areas for each of the wireless access points.