ADAPTIVE CALL ADMISSION CONTROL FOR USE IN A WIRELESS COMMUNICATION SYSTEM
First Claim
1. A subscriber station for a wireless communication system comprising:
- a modem section configured to receive downlink data from a base station on a downlink link and to transmit uplink data to the base station on an uplink link shared with other subscribers stations;
a receive signal quality module configured to monitor a downlink (DL) quality parameter for the downlink data providing a parameter value; and
a control section configured to;
determine a preferred downlink physical (PHY) mode for the downlink data among a plurality of PHY modes of different degrees of robustness, the preferred downlink PHY mode being defined between a first and a second threshold for the parameter value;
instruct the modem section to transmit to the base station an indication of the preferred downlink PHY mode;
identify in a DL sub-frame map received from the base station, a current downlink PHY mode selected for the subscriber station based on the preferred downlink PHY mode and the bandwidth available to the subscriber station on the downlink link; and
instruct the modem section to receive the downlink data based on the current downlink PHY mode,wherein the downlink PHY mode specifies a modulation format and a forward error correction technique used for transmission of downlink data.
3 Assignments
0 Petitions
Accused Products
Abstract
The invention relates to communication systems and to systems and methods for implementing adaptive call admission control (CAC) in such systems. Adaptive call admission control can determine what CPE to base station calls (connections) are allowed at any given time. CAC, coupled with precedence, can further determine what connections are suspended if less bandwidth is available than is currently committed. Multiple techniques are disclosed to select connections for suspension. These techniques include suspending enough connections through the affected CPE until there is enough bandwidth to meet the remaining commitment, randomly (or in a round robin fashion) choosing connection to suspend from the entire set of connection, and using precedence priority levels.
8 Citations
24 Claims
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1. A subscriber station for a wireless communication system comprising:
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a modem section configured to receive downlink data from a base station on a downlink link and to transmit uplink data to the base station on an uplink link shared with other subscribers stations; a receive signal quality module configured to monitor a downlink (DL) quality parameter for the downlink data providing a parameter value; and a control section configured to; determine a preferred downlink physical (PHY) mode for the downlink data among a plurality of PHY modes of different degrees of robustness, the preferred downlink PHY mode being defined between a first and a second threshold for the parameter value; instruct the modem section to transmit to the base station an indication of the preferred downlink PHY mode; identify in a DL sub-frame map received from the base station, a current downlink PHY mode selected for the subscriber station based on the preferred downlink PHY mode and the bandwidth available to the subscriber station on the downlink link; and instruct the modem section to receive the downlink data based on the current downlink PHY mode, wherein the downlink PHY mode specifies a modulation format and a forward error correction technique used for transmission of downlink data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of communication in a wireless communication system, comprising:
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receiving at the subscriber station downlink data from a base station on a downlink link and transmitting uplink data to the base station on an uplink link shared with other subscribers stations; monitoring a quality parameter for the downlink data and providing a parameter value; determining a preferred downlink physical (PHY) mode for the downlink data among a plurality of PHY modes of different degrees of robustness, the preferred PHY mode being defined between a first and a second threshold for the parameter value; transmitting to the base station an indication of the preferred PHY mode; identifying in a DL sub-frame map received from the base station, a current downlink PHY mode selected for the subscriber station based on the preferred downlink PHY mode and the bandwidth available to the subscriber station on the downlink link; and receiving the downlink data having the current downlink PHY mode, wherein the downlink PHY mode specifies a modulation format and a forward error correction technique used for transmission of downlink data. - View Dependent Claims (13, 14, 15)
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16. A method of communication in a wireless communication system, comprising:
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receiving at the subscriber station downlink data from a base station on a downlink link and transmitting uplink data to the base station on an uplink link shared with other subscribers stations; monitoring a parameter for the downlink data and providing a parameter value; transmitting to the base station the parameter value for enabling the base station to establish a current downlink PHY mode for the subscriber station based on a first and a second threshold for the parameter value and the downlink resources available to the subscriber station on the down-link; and identifying in a DL sub-frame map received from the base station, the current downlink PHY mode; and receiving the downlink data having the current downlink PHY mode, wherein the downlink PHY mode specifies a modulation format and a forward error correction technique used for transmission of downlink data. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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Specification