Radio resource management in wireless local area networks

• US 7,949,342 B2
• Filed: 09/27/2004
• Issued: 05/24/2011
• Est. Priority Date: 01/08/2004
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Cave, Christopher, Cuffaro, Angelo, Marinier, Paul, Roy, Vincent
• Primary Examiner(s): Santiago-Cordero; Marivelisse
• Assistant Examiner(s): Figueroa; Marisol
• Application Number:
  US10/951,124
• Publication Number:
  US 20050153702A1
• Time in Patent Office: 2,430 Days
• Field of Search: 455/418, 455/453, 455/63.1, 455/422.1, 455/452.2
• US Class Current: 455/452.2
• CPC Class Codes: H04W 16/08 Load shedding arrangements
• CPC Class Codes: H04W 16/10 Dynamic resource partitioning
• CPC Class Codes: H04W 52/20 using error rate
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading

Abstract

A method for radio resource management (RRM) in a wireless local area network (WLAN) having an access point and a station begins by obtaining a first group of parameters from a current traffic channel. Measurements from all available channels are taken for a second group of parameters. The radio resources of the WLAN are autonomously managed by selectively invoking at least one RRM algorithm that uses at least one parameter. A RRM algorithm may be invoked based upon results produced by a previously executed RRM algorithm, whereby RRM algorithms may be continuously invoked such that the radio resources are autonomously managed.

Claims

1. A method for operating an autonomous radio resource management (RRM) apparatus in a wireless access point (AP), comprising:

obtaining a first group of parameters from a current traffic channel;

performing a first adjustment of a transmission or reception value using at least one parameter from the first group of parameters, the transmission or reception value comprising at least one of;

a transmission power, a transmission data rate, or a channel;

performing a second adjustment of a transmission or reception value based on results produced by the first adjustment, the results comprising a change in a value of at least one of;

a received signal strength indicator, packet durations, a packet error rate, a deferral rate, acknowledgement, or a clear channel assessment threshold the second adjustment being different from the first adjustment, wherein the second adjustment is additionally based on;

a value of at least one parameter in a second group of parameters measured in all available channels, the second group comprising at least one of;

acknowledgement, clear channel assessment threshold, or received signal strength indicator;

wherein selection of the first group of parameters and the second group of parameters is a grouping based on reaction time; and

repeating the performing of the first and second adjustments, wherein radio resources are autonomously managed;

wherein the first adjustment and the second adjustment each comprise at least one of;

adjusting the transmission data rate;

adjusting determining a required received power value and adjusting the transmission power to achieve the required received power value;

producing determining a baseline range value used for determining an optimal coverage area of the AP and adjusting the transmission power to achieve the baseline range value;

producing determining a range adjustment value used for adjusting the coverage area of the AP to correct for load imbalances between the AP and neighboring APs and adjusting the transmission power to achieve the range adjustment value; and

selecting a new channel for changing a current channel assignment based on load balancing across available channels, or based on detecting intolerable levels of interference and congestion where adjusting the transmission power of the AP or adjusting the transmission data rate is not adequate.

2. The method according to claim 1, wherein the second group of parameters are measured during a silent period.

3. An integrated circuit comprising circuitry configured to:

obtain a first group of parameters from a current traffic channel;

perform a first adjustment of a transmission or reception value using at least one parameter from the first group of parameters, the transmission or reception value comprising at least one of;

a transmission power, a transmission data rate, or a channel;

perform a second adjustment of a transmission or reception value based on results produced by the first adjustment, the results comprising a change in a value of at least one of;

a received signal strength indicator, packet durations, a packet error rate, a deferral rate, acknowledgement, or a clear channel assessment threshold;

the second adjustment being different from the first adjustment, wherein the second adjustment is additionally based on;

a value of at least one parameter in a second group of parameters measured in all available channels, the second group comprising at least one of;

acknowledgement, clear channel assessment threshold, or received signal strength indicator;

wherein selection of the first group of parameters and the second group of parameters is a grouping based on reaction time; and

repeat the performing of the first and second adjustments, wherein radio resources are autonomously managed;

wherein the first adjustment and the second adjustment each comprise at least one of;

adjusting the transmission data rate;

determining a required received power value and adjusting the transmission power to achieve the required received power value;

determining a baseline range value used for determining an optimal coverage area of the AP and adjusting the transmission power to achieve the baseline range value;

determining a range adjustment value used for adjusting the coverage area of the AP to correct for load imbalances between the AP and neighboring APs and adjusting the transmission power to achieve the range adjustment value; and

selecting a new channel for changing a current channel assignment based on load balancing across available channels, or based on detecting intolerable levels of interference and congestion where adjusting the transmission power A12 or adjusting the transmission data rate is not adequate.