Method and apparatus for preventing transmission blocking in an HSUPA wireless communication system
In a wireless communication system including at least one wireless transmit/receive unit (WTRU) and at least on Node-B (NB), a method and apparatus for preventing transmission blocking comprise triggering transmission of scheduling information (SI) when transmission of a medium access control-d (MAC-d) flow is stopped. The SI is transmitted when the triggering condition is met.
1. A method for preventing transmission blocking implemented in a wireless transmit/receive unit (WTRU), the method comprising:
the WTRU triggering transmission of scheduling information (SI) on a condition that transmission from any scheduled medium access control-d (MAC-d) flow is prevented due to a non-zero grant received by the WTRU being smaller than the amount required for transmission of a MAC protocol data unit (PDU) of the MAC-d flow; and
the WTRU transmitting the SI on a condition that the triggering condition is met.
2. The method of claim 1 , further comprising the WTRU periodically transmitting the SI on a condition that the triggering condition is met.
3. The method of claim 2 wherein a period for transmitting the SI is pre-configured.
4. The method of claim 1 wherein the MAC-d flow includes a specifically defined MAC-d flow.
5. A wireless transmit/receive unit (WTRU), configured to prevent transmission blocking, the WTRU comprising:
a receiver;
a transmitter; and
a processor in communication with the receiver and the transmitter, the processor configured to trigger transmission of SI on a condition that transmission from any scheduled medium access control-d (MAC-d) flow is prevented due to a non-zero grant received by the WTRU being smaller than the amount required for transmission of a MAC protocol data unit (PDU) of the MAC-d flow, and transmit the SI on a condition that the triggering condition is met.
6. The WTRU of claim 5 wherein the processor is configured to transmit the SI on a periodic interval.
7. The WTRU of claim 6 wherein the periodic interval is pre-configured.