System and method for constructing a carrier to interference matrix based on subscriber calls

• US 8,233,907 B1
• Filed: 11/03/2004
• Issued: 07/31/2012
• Est. Priority Date: 11/03/2004
• Status: Expired due to Fees

• Current Assignee: AT&T Mobility II LLC (AT&T, Inc.)
• Original Assignee: AT&T Mobility II LLC (AT&T, Inc.)
• Inventors: Shah, Dipesh Hasmukhlal
• Primary Examiner(s): FARAGALLA, MICHAEL A
• Application Number:
  US10/979,126
• Time in Patent Office: 2,827 Days
• Field of Search: 455/423, 455/446, 455/447, 455/437, 455/445, 370/347, 370/336, 370/450, 370/328, 370/329
• US Class Current: 455/447
• CPC Class Codes: H04B 17/336 Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic

Abstract

A conventional wireless device constantly measures the signal strength of its server base station and the strength of signals from surrounding base stations for handoff purposes. The wireless device transmits this information to its serving base station, which discards the information a short time afterward, following handoff. The present system and method store the formerly discarded information in one of several existing network elements or in a separate computer system. This information is used to generate a carrier to interference ratio, which indicates the level of interference between station pairs, and to also generate a carrier to interference matrix, including identifying potential interference for each station pair. The frequency of occurrences during predetermined desired periods of time and the volume of traffic affected by each level of interference may also be calculated. This provides comprehensive, continuous, real-time information for wireless frequency planning.

Claims

1. A method of wireless frequency planning comprising:

continuously monitoring all calls for a station pair in a sector of a wireless network by constantly taking signal measurements during a call associated with the station pair to obtain actual use sampling of data for the call associated with the station pair during a given measurement period;

determining number of carrier-to-interference occurrences for the station pair;

approximating number of customers affected by a given magnitude of interference for the station pair;

receiving transmissions from wireless transmitters on a common frequency of a control channel associated with the station pair, the wireless transmitters comprising cellular base stations that provide service to network sectors that are different from each other, wherein the transmissions are stored in a table having a number incrementable by a number of occurrences of an interference parameter within a selected range for the station pair; and

determining a relative percentage for the number of occurrences that are associated with the interference parameter.

2. The method of claim 1, further comprising measuring, during a given measurement period, relative signal strengths with respect to control channel signals transmitted by the wireless transmitters.

3. The method of claim 2, further comprising determining traffic weight for occurrences of the interference parameter within the given measurement period.

4. The method of claim 1 further comprising identifying and storing signal strength measurements for switching primary communications between network sectors.

5. The method of claim 4 further comprising analyzing signal strength measurements to determine the interference parameter.

6. A wireless communication apparatus, comprising:

at least one processor configured to;

continuously monitor all calls automatically for a station pair in a sector of a wireless network to obtain actual use sampling of data by continuous measurement of signal strengths for a call associated with the station pair during a given measurement period;

determine number of carrier-to-interference occurrences for the station pair; and

approximate number of customers affected by a given magnitude of interference for the station pair; and

receive transmissions from wireless transmitters on a common frequency of a control channel associated with the station pair, the wireless transmitters comprising cellular base stations that provide service to network sectors that are different from each other, wherein the transmissions are stored in a table having a number incrementable by a number of occurrences of an interference parameter within a selected range for the station pair; and

determine a relative percentage for the number of occurrences that are associated with the interference parameter.

7. The wireless communication apparatus of claim 6, wherein the at least one processor is further configured to perform relative signal strength measurements during the given measurement period with respect to control channel signals transmitted by wireless transmitters associated with the station pair.

8. The wireless communication apparatus of claim 7, wherein the at least one processor is further configured to calculate a relative percentage of the occurrences of the interference parameter within the given measurement period.

9. The wireless communication apparatus of claim 8, wherein the at least one processor is further configured to calculate traffic weight for the occurrences of the interference parameter within the given measurement period.

10. The wireless communication apparatus of claim 6, wherein the at least one processor is further configured to identify and store signal strength measurements used to switch primary communications between network sectors.

11. The wireless communication apparatus of claim 7, wherein the wireless transmitters associated with the station pair comprise cellular base stations that provide service to network sectors that are different from each other.

12. A method of wireless frequency planning comprising:

continuously monitoring all calls for a station pair in a sector of a wireless network by constantly taking signal measurements during a call associated with a station pair to obtain actual use sampling of data for the call associated with the station pair during a given measurement period;

determining number of carrier-to-interference occurrences for the station pair;

constructing a carrier-to-interference matrix;

approximating number of customers affected by a given magnitude of interference for the station pair;

receiving transmissions from wireless transmitters on a common frequency of a control channel associated with the station pair, the wireless transmitters comprising cellular base stations that provide service to network sectors that are different from each other, wherein the transmissions are stored in a table having a number incrementable by a number of occurrences of an interference parameter within a selected range for the station pair; and

determining a relative percentage for the number of occurrences.