Load monitoring and management in a CDMA wireless communication system

• US 5,859,838 A
• Filed: 07/30/1996
• Issued: 01/12/1999
• Est. Priority Date: 07/30/1996
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Soliman, Samir S.
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): RAO, SEEMA SRINIVAS
• Application Number:
  US08/688,453
• Time in Patent Office: 896 Days
• Field of Search: 370/229, 370/232, 370/233, 370/234, 370/241, 370/249, 370/252, 370/310, 370/311, 370/313, 370/328, 370/329, 370/332, 370/335, 370/342, 455/67.1, 455/67.4, 455/69, 455/70, 455/115, 455/126, 455/522, 455/453, 379/29, 379/33, 375/224, 375/200
• US Class Current: 370/249
• CPC Class Codes: H04B 7/216 Code division or spread-spectrum multiple access [CDMA, SSMA]
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/343 taking into account loading or congestion level

Abstract

A system and method for monitoring and managing the loading conditions in a CDMA wireless communication system. The system comprises a load monitoring device such as a CDMA mobile station connected to a data logging and processing device such as a diagnostic monitor. The monitoring device is placed within the service area of a base station. The monitoring device periodically initiates a call, is assigned to a traffic channel normally, and logs a power control parameter such as mobile station transmit power or the number of closed-loop power control commands received per unit time. From this information, the load monitoring device can infer the real-time traffic loading conditions of the base station. If the loading of the system exceeds a predetermined threshold, an alarm may be sent to the system management center in order to take some action to limit additional loading on the base station.

Claims

1. A system for determining the loading on a CDMA base station which transmits closed-loop power control commands, said CDMA base station being controlled by a system management center, said system comprising:

a CDMA communication device having a transmit circuit for originating a first communication and a second communication with said CDMA base station, origination of said first communication being separated from origination of said second communication by a predetermined time interval, said CDMA communication device having a receive circuit for receiving said closed-loop power control commands;

a data processor coupled to said receive circuit for logging and for processing said closed-loop power control commands received during said first and said second communications and for generating a data signal, based on said processing, as an output of said data processor; and

said data processor coupled to said system management center, said system management center processing said data signal and controlling said CDMA base station in response to said data signal.

2. The system of claim 1 wherein said data processor transmits an alarm signal to said system management center if a difference between said processed closed-loop power control commands received during said first communication and said processed closed-loop power control commands received during said second communication exceeds a predetermined threshold.

3. The system of claim 2 wherein said system management center prevents further loading of said base station in response to said alarm signal.

4. The system of claim 3 wherein said data processor is a CDMA diagnostic monitoring device.

5. A method for determining the loading on a CDMA base station which transmits closed-loop power control commands, said CDMA base station being controlled by a system management center, said method comprising the steps of:

originating a first communication with said CDMA base station;

receiving a first set of closed-loop power control commands;

logging said first set;

originating a second communication with said CDMA base station at a time separated from origination of said first communication by a predetermined time interval;

receiving a second set of closed-loop power control commands;

logging said second set;

processing said first and second sets of closed-loop power control commands to generate a data signal;

providing said data signal to said system management center; and

said system management center controlling the loading of said base station in response to said data signal.

6. The method of claim 5 wherein said transmitting step further comprises transmitting an alarm signal to said system management center if a difference between said closed-loop power control commands received during said first communication and said closed-loop power control commands received during said second communication exceeds a predetermined threshold.

7. The method of claim 6 further comprising the step of preventing, from said system management center, further loading of said base station in response to said alarm signal.

8. A system for determining the loading on a CDMA base station which transmits closed-loop power control commands, said CDMA base station being controlled by a system management center, said system comprising:

a CDMA communication device having a transmit circuit for originating a first communication and a second communication with said CDMA base station, origination of said first communication being separated from origination of said second communication by a predetermined time interval, said CDMA communication device having a receive circuit for receiving said closed-loop power control commands;

a data processor coupled to said receive circuit for logging and for processing a power control parameter during said first and said second communications and for generating a data signal, based on said processing, as an output of said data processor;

said power control parameter comprising at least one of;

reverse link transmit power of the CDMA communication device;

received power at the CDMA communication device; and

closed-loop power control commands received from the base station; and

said data processor coupled to said system management center, said system management center processing said data signal and controlling said CDMA base station in response to said data signal.

9. The system according to claim 8 wherein said first communication is initiated during a peak usage hour and said second communication is initiated during a non-peak usage hour.