Adaptive call admission control for use in a wireless communication system

A communication system that is configured to control the admission of new connections and the suspension of existing connections between a base station and customer premise equipments (CPEs), wherein the base station and the CPEs are each configured to increase or decrease the robustness of their transmission modulation technique, the system comprising:

• a first CPE having a first modem configured to modulate data in a communication link using a first current modulation scheme and a first initial modulation scheme different from the first current modulation scheme;
• a second CPE having a second modem configured to modulate data in a communication link using a second current modulation scheme and a second initial modulation scheme;
• a base station having a third modem configured to transmit and receive data to and from the first and second CPEs;
• and
• a call admission control (CAC) module configured to determine whether to allow a new connection between the first CPE and the base station or between the second CPE and the base station based on a comparison of a total air link line rate between the first and second CPEs and the base station, wherein the total air link line rate is based on a reference modulation scheme, with a bandwidth commitment value between the base station and the first and second CPEs.

A method of performing call admission control in a communication system that supports subscriber level adaptive PHY modes, the system including a base station and at least one customer premise equipment (CPE), the method comprising:

• determining selected modulation schemes for the CPEs based on their planned modulation techniques and quality of service requirements;
• determining a reference line rate for the communication system when using a reference modulation scheme;
• determining multiplicative rates for normalizing CPEs selected modulation schemes to the reference modulation scheme;
• comparing the reference line rate to bandwidth requirements using the normalized selected modulation schemes;
• and
• allowing or denying a new connection between the base station and the CPEs based on the comparison.

A system for performing call admission control in a subscriber level forward error correction schemes;

• the system comprising:
• terminals with associated current and initial forward error correction schemes, wherein each terminal transmits using the current forward error correction scheme which is different from the initial forward error correction scheme for at least one terminal, and wherein the initial forward error correction scheme is selected for each terminal based on system level characteristics;
• a base station configured to transmit and receive data to and from the terminals via the connections;
• and
• a call admission control module configured to determine whether to allow a new connection between the terminals and the base station by comparing an air link line rate with a total hard bandwidth commitment between the terminals and the base station, wherein the determining is based on forward error correction schemes.