System and method for obtaining Ec/Io for use in positioning a base station for mobile communication network

• US 6,466,560 B1
• Filed: 12/07/1998
• Issued: 10/15/2002
• Est. Priority Date: 07/28/1998
• Status: Expired due to Term

• Current Assignee: KT Corporation
• Original Assignee: Hansol Paper Company Limited
• Inventors: Lee, Sang-Keun, Baek, Chil-hyun
• Primary Examiner(s): ZIMMERMAN, BRIAN A
• Application Number:
  US09/207,097
• Time in Patent Office: 1,408 Days
• Field of Search: 370/335, 370/328, 370/342, 455/446, 455/423, 455/424, 455/524, 455/67.1, 455/67.7, 455/67.4
• US Class Current: 370/335
• CPC Class Codes: H04W 16/18 Network planning tools

Abstract

A system and a method for obtaining Ec/Io for a predetermined site for use in positioning a base station for a mobile communication network. Continuous waves having a constant output power and frequencies different from each other are generated by many continuous wave generators. The continuous waves are received from the continuous wave generators so as to measure RSSI of the continuous waves and GPS information. Ec/Io of a predetermined site is measured from the RSSI of the continuous waves and the GPS information. Accordingly, the measurement for positioning a base station is performed with regard to adjacent interference under actual circumstances so that a new base station can be positioned on a proper site.

Claims

1. A system for obtaining Ec/Io for a predetermined site for use in positioning a base station used for a mobile communication system using CDMA, comprising:

a plurality of continuous wave generators for generating continuous waves of constant output power, the continuous waves having frequencies different from each other;

a continuous wave receiver for receiving the continuous waves from the plural of continuous wave generators so as to measure RSSI of the continuous waves, and receiving GPS information at the same time; and

a computer for receiving the RSSI of the continuous waves and the GPS information so as to measure Ec/Io of a predetermined site;

wherein the continuous wave receiver comprises;

a receiving antenna for receiving the continuous waves;

a frequency generator for periodically generating a plurality of frequencies different from each other;

a frequency synthesizer for synthesizing an output frequency of the frequency generator and a signal received on the receiving antenna so as to convert into an intermediate frequency;

a switching part for outputting a predetermined signal by periodically switching the intermediate frequency from the frequency synthesizer;

a RSSI sensor for sensing the RSSI from an output of the switching part;

a A/D convertor for converting the RSSI into a digital signal;

a decoder for receiving the digital signal of the RSSI while controlling the output frequency from the frequency generator and a switching operation of the switching part;

a GPS antenna for receiving GPS signal; and

a GPS receiver for measuring latitude, longitude and time information from the GPS signal.

2. The system according to claim 1, wherein each of the continuous wave generators comprises:

a key pad for selecting an output frequency and an output power;

a microprocessor for receiving an input of the key pad so as to control the output frequency and the output power, the microprocessor for making a command to display the values of the output frequency and the output power;

a frequency synthesizer for receiving the command from the microprocessor to output a selected frequency;

an output power regulator for receiving the command from the microprocessor to control an output power of the selected frequency;

a high-output amplifier for amplifying a signal from the output power regulator;

and a transmitting antenna for broadcasting an output of the high-output amplifier.

3. The system according to claim 1, wherein the continuous wave receiver also receives frequency of a adjacent common base station so as to measure RSSI thereof.

4. A method for obtaining Ec/Io for a predetermined site for use in positioning a base station used for a mobile communication system using CDMA, comprising the steps of:

a) receiving a plurality of continuous waves different from each other so as to measure RSSI thereof;

b) receiving GPS information to measure latitude, longitude and time;

c) calculating a path loss of each of the continuous waves from the RSSI;

d) calculating CDMA Tx ERP of a candidate base station by using CDMA parameter of a predetermined candidate base station;

e) calculating CDMA Rx by subtracting the path loss from the CDMA Tx ERP;

f) calculating Io form the CDMA Rx;

g) calculating Ec determined by a predetermined ratio fo the CDMA Rx;

h) judging whether frequency of an adjacent cell is received or not so as to calculate Ioc;

i) calculating Ec/Io by substituting a predetermined NoW for the calculated Io, Ioc and Ec; and

j) matching the Ec/Io with the GPS information for a predetermined site.

5. The according to claim 4, wherein the a) step further comprises a step for receiving frequency of an adjacent common base station so as to measure RSSI thereof.

6. The method according to claim 4, wherein, in f) step, Io is calculated by a subtracting a self-interference of a communication channel in a corresponding cell.

7. The method according to claim 4, wherein the h) step comprises the steps of:

a) judging whether frequency of an adjacent common base station is received or not; and

b) calculating Ioc with the RSSI of the received signal if the frequency of the adjacent commercial base station is received.

8. The method according to claim 7, wherein in the h) step, Ioc is calculated by compensating a load factor of the adjacent common base station at the time of measurement.

9. Obtaining Ec/Io for a predetermined site for use in positioning a base station used for a mobile communication system using CDMA, comprising the steps of:

a) installing a plurality of continuous wave transmitters for generating frequencies different from each other at mutually adjacent cells, respectively;

b) receiving a continuous wave signal from one cell at which one of the continuous wave transmitters is positioned and from another cell adjacent to the one cell among the mutually adjacent cells so as to measure RSSI of each of the signals;

c) receiving GPS iformation to measure latitude, longitude and time;

d) calculating a path loss of each of thee continuous wave signals from the RSSI of each of the received continuous wave signals;

e) calculating CDMA Tx ERP of each candidate base station by using a CDMA parameter of the each candidate base station of a predetermined correspondings cell and an adjacent cell thereof;

f) calculating CDMA Rx by subtracting the path loss from the CDMA Tx ERP of the each candidate base station;

g) calculating Io from CDMA

h) calculating Ec determined by a predetermined ratio of the CDMA Rx;

i) judging whether frequency of an adjacent cell is received or not so as to calculate Ioc;

j) calculating Ec/Io by substituting a predetermined NoW for the calculated Io, Ioc and Ec; and

k) matching the Ec/Io with the GPS information of a predetermined site.

10. The method according to claim 9, wherein b) step further comprises a step for receiving frequency of an adjacent common base station so as to measure the RSSI thereof.

11. The method according to claim 9, wherein, in the g) step, Io is calculated by subtracting a self-interference of a communication channel in a corresponding cell.

12. The method according to claim 9, wherein the I) step comprises the steps of:

a) judging whether frequency of a adjacent commercial base station is received or not; and

b) calculating Ioc with RSSI of the received signal if the frequency of the adjacent common base station is received.

13. The method according to claim 12, wherein, in the b) step, Ioc is calculated by compensating a load factor of the adjacent common base station at the time of measurement.

14. The method according to claim 9, wherein, in the I) step, Ioc is calculated by adding CDMA Rx of the adjacent cell.

15. The method according to claim 9, wherein, in the I) step, Ioc is calculated, if the frequency of the adjacent commercial base station is received, by adding the RSSI of the received signal and the CDMA Rx of the adjacent cell.

16. The method according to claim 15, wherein the Ioc is calculated by compensating a load factor of the adjacent common base station at the time of measurement.