Method and apparatus for adjusting channel quality indicator feedback period to increase uplink capacity
A method and apparatus for adjusting a channel quality indicator (CQI) feedback period to increase uplink capacity in a wireless communication system are disclosed. The uplink capacity is increased by reducing the uplink interference caused by CQI transmissions. A wireless transmit/receive unit (WTRU) monitors a status of downlink transmissions to the WTRU and sets the CQI feedback period based on the status of the downlink transmissions to the WTRU. A base station monitors uplink and downlink transmission needs. The base station determines the CQI feedback period of at least one WTRU based on the uplink and downlink transmission needs and sends a command to the WTRU to change the CQI feedback period of the WTRU.
1. A method for use in a wireless transmit/receive unit, the method comprising:
receiving a radio resource control (RRC) message including channel quality indicator (CQI) configuration information associated with more than one CQI feedback periods for reporting CQI;
transmitting CQI information according to CQI configuration information associated with a first CQI feedback period of the more than one CQI feedback periods; and
on condition that the WTRU receives a message: (1) including a CQI feedback command; and (2) masked with a WTRU identity associated with the WTRU, transmitting the CQI information according to CQI configuration information associated with a second CQI feedback period of the more than one CQI feedback periods.
2. The method of claim 1 , wherein a CQI feedback period is associated with a number of TTIs between CQI information transmissions.
3. The method of claim 1 , further comprising monitoring a physical downlink control channel.
4. The method of claim 1 , wherein the first CQI feedback period is different than the second CQI feedback period.
5. A wireless transmit/receive unit (WTRU) comprising:
a receiver configured to receive a radio resource control (RRC) message including channel quality indicator (CQI) configuration information associated with more than one CQI feedback periods for reporting CQI;
a transmitter configured to transmit CQI information according to CQI configuration information associated with a first CQI feedback period of the more than one CQI feedback periods; and
the transmitter further configured to, on condition that the WTRU receives a message: (1) including a CQI feedback command; and (2) masked with a WTRU identity associated with the WTRU, transmit the CQI information according to CQI configuration information associated with a second CQI feedback period of the more than one CQI feedback periods.
6. The WTRU of claim 5 , wherein a CQI feedback reporting period is associated with a number of TTIs between CQI information transmissions.
7. The WTRU of claim 5 , further comprising a processor configured to monitor a physical downlink control channel.
8. The WTRU of claim 5 , wherein the first CQI feedback period is different than the second CQI feedback period.
9. Circuitry for use in a transceiver device, the circuitry, including at least one integrated circuit (IC), a processor, and a memory storing instructions executable by one or more of the at least one IC and the processor, is configured to:
receive a radio resource control (RRC) message including channel quality indicator (CQI) configuration information associated with more than one CQI feedback periods for CQI;
transmit CQI information according to CQI configuration information associated with a first CQI feedback period of the more than one CQI feedback periods; and
on condition that the WTRU receives a message: (1) including a CQI feedback command; and (2) masked with a WTRU identity associated with the WTRU, transmit the CQI information according to CQI configuration information associated with a second CQI feedback period of the more than one CQI feedback periods.
10. The circuitry of claim 9 , wherein a CQI feedback reporting period is associated with a number of TTIs between CQI information transmissions.
11. The circuitry of claim 9 , further configured to monitor a physical downlink control channel.
12. The circuitry of claim 9 , wherein the first CQI feedback period is different than the second CQI feedback period.