Method for automatic creation of peripheral zone information

• US 5,732,327 A
• Filed: 12/19/1995
• Issued: 03/24/1998
• Est. Priority Date: 12/28/1994
• Status: Expired due to Term

• Current Assignee: NTT Mobile Communications Network Inc. (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Mobile Communications Network Inc. (Nippon Telegraph and Telephone Corporation)
• Inventors: Wakabayashi, Tatsuaki, Yoshimi, Masaaki, Nagata, Kiyohito, Kakinuma, Kazuhiko
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): Armstrong, Darnell R.
• Application Number:
  US08/574,897
• Time in Patent Office: 826 Days
• Field of Search: 455/418, 455/419, 455/422, 455/433, 455/423, 455/437, 455/446, 455/436, 455/67.1, 455/62, 455/448, 455/525, 455/524, 455/434-435
• US Class Current: 455/67.11
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements

Abstract

Each base station measures the field intensity of downlink rediowaves from other base stations, then analyzes the received rediowaves above a predetermined field intensity value and decides whether they are rediowaves used in the same mobile radio communication system. The base station creates peripheral base station information based on information about the rediowaves decided as being used in the same mobile radio communication system.

Claims

1. A method for creating peripheral zone information by each radio base station disposed in one of a plurality of zones forming the service area of a mobile radio communication system, comprising the steps of:

(a) measuring the field intensity of downlink radiowaves of all frequencies in each of said plurality of zones and deciding whether said field intensity is above a prescribed value;

(b) analyzing those downlink radiowaves having the field intensity above said prescribed value and deciding whether they are radiowaves of said mobile radio communication system; and

(c) creating frequency channel information of peripheral base stations as said peripheral zone information on the basis of the frequency channels of said radiowaves decided to be those used in said mobile radio communication system.

2. A method for creating peripheral zone information by each radio base station disposed in one of a plurality of zones forming the service area of a mobile radio communication system, comprising the steps of:

(a) measuring, at each of said radio base stations, the field intensity of radiowaves of all frequency bands other than those from said each radio base station;

(b) deciding whether there exist downlink radiowaves around said each radio base station on the basis of the measured results;

(c) analyzing, at said each radio base station, said radiowaves decided to exist as to whether they are radiowaves that are used in said mobile radio communication system;

(d) deciding on the basis of the analyzed results as to whether radio base stations radiating such radiowaves are peripheral base stations; and

(e) recognizing the peripheral base station condition around said each radio base station and creating and updating peripheral base station information as said peripheral zone information on the basis of said measured and analyzed results.

3. A method for creating peripheral zone information by each radio base station disposed in one of a plurality of zones forming the service area of a mobile radio communication system, comprising the steps of:

(a) measuring, at said each radio base station, the field intensity of radiowaves of all downlink frequency bands other than that of a downlink frequency of said each radio base station;

(b) deciding on the basis of the measured results as to whether there exist downlink radiowaves around said each radio base station;

(c) requesting, at said each radio base station, a mobile station to analyze whether said radiowaves decided to exist are radiowaves used in said mobile radio communication system;

(d) analyzing, at said mobile station, whether said radiowaves are those used in said mobile radio communication system;

(e) reporting the analyzed results from said mobile station to said each radio base station;

(f) deciding, at said each radio base station, whether radio base stations radiating said radiowaves are peripheral base stations on the basis of said analyzed results; and

(g) recognizing the peripheral base station condition around said each radio base station and creating and updating peripheral base station information as said peripheral zone information on the basis of said measured and analyzed results.

8. The method of claim 3, further comprising the steps of:

(h) measuring, at a mobile station staying in the zone of said each radio base station, the field intensity of radiowaves frequencies other than the downlink frequency of said each radio base station of said zone;

(i) reporting the measured results from said mobile station to said each radio base station of said zone;

(j) deciding, at said each base station, whether said mobile station is capable of analyzing said field-intensity measured radiowaves and if said mobile station is decided to be capable of making said analysis, specifying the frequencies of said radiowaves and requesting said mobile station to analyze whether said radiowaves of said specified frequencies are those used in said mobile radio communication system;

(k) analyzing said radiowaves of said specified frequencies at said mobile station;

(l) reporting the analyzed results from said mobile station to said each radio base station;

(m) deciding, at said each radio base station having received said report, whether radio base stations radiating said radiowaves of said specified frequencies are peripheral thereto on the basis of said reported analyzed results; and

(n) recognizing, at said each base station, the peripheral base station condition around it and creating and updating peripheral base station information as said peripheral zone information.

9. The method of claim 8, further comprising the steps of:

(o) at the time of entering a new zone from the current visiting zone, a mobile station measures the field intensity of downlink control channel radiowaves from a radio base station of said current visiting zone and the field intensity of downlink control channel radiowaves from a radio base station of said new zone;

(p) reporting the measured results from said mobile station to said radio base station of said new zone; and

(q) deciding, at said radio base station of said new zone, whether said radio base station of said current visiting zone is peripheral thereto and creating and updating peripheral base station information as said peripheral zone information on the basis of said measured results.

4. A method for creating peripheral zone information by each radio-base station disposed in one of a plurality of zones forming the service area of a mobile radio communication system, comprising the steps of:

(a) measuring at a mobile station the field intensity of radiowaves of all frequencies other than that of a downlink frequency of a radio base station of the mobile station'"'"'s visiting zone;

(b) reporting the measured results to said radio base station of said visiting zone;

(c) checking, said measured results, at said radio base station receiving said report for radiowaves above a predetermined field intensity value, then if they exist, specifying the frequencies of such radiowaves and requesting said mobile station to analyze whether said radiowaves above said predetermined field intensity value are those used in said mobile radio communication system;

(d) analyzing said radiowaves of said specified frequencies at said mobile station;

(e) reporting the analyzed results from said mobile station to said requesting radio base station;

(f) deciding, at said radio base station, whether radio base stations radiating said radiowaves of said specified frequencies are peripheral base stations on the basis of said measured and analyzed results; and

(g) recognizing the peripheral base station condition around said radio base station and creating and updating peripheral base station information as said peripheral zone information.

5. A method for creating peripheral zone information by each radio base station disposed in one of a plurality of zones forming the service area of a mobile radio communication system, comprising the steps of:

(a) autonomously measuring the field intensity of radiowaves of all downlink frequency bands at a mobile station;

(b) deciding whether there exist downlink radiowaves from other base stations peripheral to that of the mobile station'"'"'s visiting zone on the basis of the measured results;

(c) autonomously analyzing at said mobile station whether the radiowaves decided to exist are those used in said mobile radio communication system;

(d) recognizing at said mobile station the peripheral base station condition around said radio base station of said visiting zone on the basis of said analyzed results;

(e) reporting information about said peripheral base station condition from said mobile station to said radio base station of said visiting zone; and

(f) creating and updating, at said radio base station, peripheral base station information as said peripheral zone information on the basis of said reported information.

6. A method for creating peripheral zone information by each radio base .station disposed in one of a plurality of zones forming the service area of a mobile radio communication system, comprising the steps of:

(a) At the time of entering a new zone from a current visiting zone, a mobile station measures the field intensity of downlink control channel radiowaves from a radio base station of said current visiting zone and the field intensity of downlink control channel radiowaves from a radio base station of said new zone;

(b) deciding whether said current visiting zone is a zone peripheral to said new zone on the basis of the measured results;

(c) reporting the presence of said radio base station of said current visiting zone to said radio base station of said new zone if the former is decided to be peripheral to the later; and

(d) creating and updating, at said radio base station of said new zone, peripheral base station information as said peripheral zone information on the basis of said report.

7. A method for creating peripheral zone information by each radio, base station disposed in one of a plurality of zones forming the service area of a mobile radio communication system, comprising the steps of:

(a) at the time of entering a new zone a the current visiting zone, a mobile station measures the field intensity of downlink control channel radiowaves from a radio base station of said current visiting zone and the field intensity of downlink control channel radiowaves from a radio base station of said new zone;

(b) reporting the measured results from said mobile station to said radio base station of said new zone; and

(c) deciding, at said radio base station of said new zone, whether said radio base station of said current visiting zone is peripheral thereto and creating and updating peripheral base station information as said peripheral zone information on the basis of said measured results.