Adaptive resource allocation in a mobile telephone system

• US 5,335,356 A
• Filed: 09/05/1991
• Issued: 08/02/1994
• Est. Priority Date: 09/05/1991
• Status: Expired due to Term

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Andersson, Hans E.
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): SOBUTKA, PHILIP
• Application Number:
  US07/755,148
• Time in Patent Office: 1,062 Days
• Field of Search: 455/33.1, 455/33.2, 455/33.3, 455/33.4, 455/54.1, 455/54.2, 455/55.1, 455/56.1, 455/62, 455/67.1, 455/67.2, 455/67.3, 455/67.4, 455/67.5, 455/67.6 , 455/67.7, 455/226.1, 455/226.2, 455/226.3, 379/60, 379/58
• US Class Current: 455/517
• CPC Class Codes: H04W 36/0088 Scheduling hand-off measurements
• CPC Class Codes: H04W 36/302 due to low signal strength

Abstract

Transmission quality of an ongoing call in a mobile radiotelephone system is monitored by measuring parameters indicative of transmission quality, evaluating transmission quality according to the measured parameters, repeatedly measuring the aforementioned parameters at intervals, and repeatedly evaluating transmission quality according to the measured parameters at a time interval variable according to the results of the previous evaluation. Effectively, the calls in progress are divided into different classes according to transmission quality with some classes requiring monitoring relatively frequently and other classes requiring monitoring relatively infrequently. Alternatively, the waiting interval according to which a call is monitored may be determined on an individual cell-by-cell basis.

Claims

1. A method of monitoring and altering transmission quality of a call in a mobile radiotelephone system, comprising the steps of:

measuring properties of a radio channel carrying said call at a plurality of receiver sites to yield a plurality of measurements;

evaluating said measurements;

repeating said measuring step at intervals;

repeating said evaluating step at a variable time interval equal to the smallest time value of a set comprising a first time value determined as a function of a measurement indicative of quality of reception at a receiver site presently handling said call, a second time value determined as a function of a measurement indicative of a distance of a mobile station party to said call from said receiver site presently handling said call, and a third time value determined as a function of a difference between a signal strength measurement at said receiver site handling said call and a greatest signal strength measurement at the remaining receiver sites; and

issuing a command to alter said transmission quality responsive to said evaluating step.

2. An apparatus for monitoring and altering transmission quality of a call in a mobile radiotelephone system comprising:

means for measuring properties of a radio channel carrying said call at a plurality of receiver sites to yield a plurality of measurements;

means for evaluating said measurements;

means for repeating said measuring step at intervals;

means for repeating said evaluating step at a variable time interval equal to the smallest time value of a set comprising a first time value determined as a function of a measurement indicative of quality of reception at a receiver site presently handling said call, a second time value determined as a function of a measurement indicative of a distance of a mobile station party to said call from said receiver site presently handling said call, and a third time value determined as a function of a difference between a signal strength measurement at said receiver site handling said call and a greatest signal strength measurement at the remaining receiver sites; and

means for issuing a command to alter said transmission quality responsive to said evaluating step.

3. A method of monitoring and altering transmission quality of a call in a mobile radiotelephone system, comprising the steps of:

measuring quality of reception of said call at a cell receiver presently handling said call and at a plurality of neighboring cell receivers;

determining a distance between a mobile station party to said call and said cell receiver presently handling said call;

evaluating;

whether quality of reception is better at a neighboring cell receiver;

whether quality of reception at said cell handling said call is unacceptable; and

whether said distance between said mobile station party to said call and said cell receiver presently handling said call is greater than a predetermined limit;

repeating said measuring step at intervals;

repeating said evaluating step at a variable time interval equal to the smallest time value of a set comprising a first tie value determined as a function of said quality of reception at said cell receiver presently handling said call, a second time value determined as a function of said distance of said mobile station from said cell receiver presently handling said call, and a third time value determined as a function of a difference between quality of reception at said cell receiver handling said call and a highest quality of reception at the neightboring cell receivers; and

issuing a command to alter said transmission quality responsive to said evaluating step.