Wireless transmission evaluation system and method

• US 7,085,592 B1
• Filed: 09/29/2000
• Issued: 08/01/2006
• Est. Priority Date: 09/29/2000
• Status: Expired due to Term

• Current Assignee: WSOU Investments, LLC (WSOU Holdings, LLC)
• Original Assignee: Alcatel Canada Inc. (Nokia Corporation)
• Inventors: Davies, Douglas Allan
• Primary Examiner(s): Trost, William
• Assistant Examiner(s): Ewart, James D
• Application Number:
  US09/676,402
• Time in Patent Office: 2,132 Days
• Field of Search: 455/12.1, 455/67.14, 455/423, 455/424, 455/425, 455/561, 455/562, 455/3.06, 455/426.2, 343/703, 343/757, 343/758, 343/761, 343/765, 343/766, 343/882
• US Class Current: 455/562.1
• CPC Class Codes: H01Q 3/08 for varying two co-ordinates of the orientation
• CPC Class Codes: H04B 17/16 Test equipment located at the transmitter
• CPC Class Codes: H04B 17/20 of receivers

Abstract

A signal testing system and method for evaluating wireless communication signals transmitted between a base station and a communication site is provided. The signal testing system comprises an antenna located at the communication site for communicating the wireless communication signals between the base station and the communication site, an adjustable mount associated with the antenna for orienting the antenna in a plurality of pan orientations and a plurality of tilt orientations, an adjustable boom associated with the adjustable mount for positioning the antenna at a plurality of heights and a communication unit to measure characteristics of the wireless communication signals. The adjustable mount is fixed in a set pan orientation and a set tilt orientation and the adjustable boom is fixed height when the communication unit measures the characteristics of the wireless communication signals. The method uses the system.

Claims

1. A method of evaluating a tentative location for a fixed subscriber communication site of a wireless communication system using a wireless testing system, said wireless testing system comprising a testing antenna for communicating wireless communication signals with a transmit antenna and a receive antenna at a base station, an adjustable mount associated with said testing antenna for orienting said testing antenna in a plurality of pan orientations and a plurality of tilt orientations, an adjustable boom attached to said adjustable mount for positioning said testing antenna at a plurality of heights, a signal measuring device associated with said testing antenna and a signal attenuator associated with said testing antenna, said method comprising:

at said tentative location

a) positioning said testing antenna such that an angle α

defined by said testing antenna as a vertex between said transmit and receive antennae is 1.5 degrees or less;

b) adjusting tilt, pan, and height of said testing antenna to exchange wireless communication signals with said transmit and receive antennae;

c) measuring a characteristic of said wireless communication signals received by said testing antenna by integrating a power signal of said wireless communication signals across a frequency band associated with said wireless communication signals;

d) attenuating said wireless communication signals until said testing antenna no longer receives said wireless communication signals from said transmit antenna;

e) calculating ambient atmospheric and meteorological conditions corresponding to said amount of attenuation based on a distance between said testing antenna and said base station; and

f) comparing said calculations of said ambient atmospheric and meteorological conditions to a predetermined threshold level required to maintain a level of service required for communications with said base station when said ambient atmospheric and meteorological conditions exist,

wherein, if said level of attenuation exceeds said threshold level, said tentative location for said fixed subscriber communication site is acceptable.

2. A method of establishing an optimal location for a fixed subscriber communication site for a base station having a transmit antenna and a receive antenna, comprising:

at a tentative location for said fixed subscriber communication site

a) positioning a testing antenna such that an angle α

defined by said testing antenna as a vertex between said transmit and said receive antennae is 1.5 degrees or less;

b) adjusting tilt, pan, and height of said testing antenna to exchange wireless communication signals with said transmit and said receive antennae; and

c) measuring a characteristic of said wireless communication signals with said communication unit.

3. The method of establishing an optimal location for a fixed subscriber communication site, as claimed in claim 2 wherein

said testing antenna, receive antenna and transmit antenna are located relative to each other to form a right angle triangle;

tan α

is less than or equal to a ratio comprising

a numerator comprising a distance from said receive antenna to said transmit antenna; and

a denominator comprising a distance from said testing antenna to one of said receive antenna and said transmit antenna.

4. The method as claimed in claim 3, wherein said characteristic is power of said wireless communication signals integrated over a frequency band associated with said wireless communication signals.

5. The method as claimed in claim 4, further comprising

attenuating said wireless communication signals until said testing antenna receives practically none of said wireless communication signals transmitted by said base station;

calculating ambient atmospheric and meteorological conditions corresponding to said amount of attenuation based on a distance between said testing antenna and said base station; and

comparing said ambient atmospheric and meteorological conditions to a predetermined threshold level required to maintain a level of service required for said testing antenna to communicate with said base station when said ambient atmospheric and meteorological conditions are present between said base station and said testing antenna.

6. The method as claimed in claim 2, further comprising:

repeating steps a), b) and c) at a second location;

comparing characteristics measured at said tentative location and said second location; and

selecting one of said tentative location and said second location as said optimal location based on said step of comparing characteristics.

7. The method as claimed in claim 2, further comprising variably attenuating said wireless communication signals before evaluating said characteristics of said wireless communication signals to simulate ambient atmospheric and meteorological conditions around said wireless testing system.

8. A method of establishing an optimal location for a fixed subscriber communication site for a base station having a transmit antenna and a receive antenna, comprising:

at a tentative location for said fixed subscriber communication site

a) positioning a testing antenna such that an angle α

defined by said testing antenna as a vertex between said transmit and said receive antennae is small enough to ensure that transmissions received at the base station from both said transmit antenna and said receive antenna are within half power points of an antenna pattern at said base station;

b) adjusting tilt, pan, and height of said testing antenna to exchange wireless communication signals with said transmit and said receive antennae; and

c) measuring a characteristic of said wireless communication signals with said communication unit.

9. A method of evaluating a tentative location for a fixed subscriber communication site of a wireless communication system using a wireless testing system, said wireless testing system comprising a testing antenna for communicating wireless communication signals with a transmit antenna and a receive antenna at a base station, an adjustable mount associated with said testing antenna for orienting said testing antenna in a plurality of pan orientations and a plurality of tilt orientations, an adjustable boom attached to said adjustable mount for positioning said testing antenna at a plurality of heights, a signal measuring device associated with said testing antenna and a signal attenuator associated with said testing antenna, said method comprising:

at said tentative location

a) positioning said testing antenna such that an angle α

defined by said testing antenna as a vertex between said transmit and receive antennae is small enough to ensure that transmissions received at the base station from both said transmit antenna and said receive antenna are within half power points of an antenna pattern at said base station;

b) adjusting tilt, pan, and height of said testing antenna to exchange wireless communication signals with said transmit and receive antennae;

c) measuring a characteristic of said wireless communication signals received by said testing antenna by integrating a power signal of said wireless communication signals across a frequency band associated with said wireless communication signals;

d) attenuating said wireless communication signals until said testing antenna no longer receives said wireless communication signals from said transmit antenna;

e) calculating ambient atmospheric and meteorological conditions corresponding to said amount of attenuation based on a distance between said testing antenna and said base station; and

f) comparing said calculations of said ambient atmospheric and meteorological conditions to a predetermined threshold level required to maintain a level of service required for communications with said base station when said ambient atmospheric and meteorological conditions exist,

wherein, if said level of attenuation exceeds said threshold level, said tentative location for said fixed subscriber communication site is acceptable.