Cognitive flow control based on channel quality conditions
A system and method which improve the performance of a wireless transmission system by intelligent use of the control of the flow of data between a radio network controller (RNC) and a Node B. The system monitors certain criteria and, if necessary, adaptively increases or decreases the data flow between the RNC and the Node B. This improves the performance of the transmission system by allowing retransmitted data, signaling procedures and other data to be successfully received at a faster rate, by minimizing the amount of data buffered in the Node B. Flow control is exerted to reduce buffering in the Node B upon degradation of channel qualities, and prior to a High Speed Downlink Shared Channel (HS-DSCH) handover.
1. A method for use in a radio network controller (RNC), the method comprising:
the RNC transmitting a capacity request to a Node B, the capacity request indicating an amount of data that the RNC has available to send to the Node B;
the RNC receiving a capacity allocation from the Node B in response to the capacity request, wherein the capacity allocation is determined based on a channel quality index (CQI) transmitted by a wireless transmit/receive unit (WTRU) to the Node B in response to receiving data from the Node B; and
the RNC transmitting an amount of data to the Node B that does not exceed the capacity allocation.
2. A method for use in a Node B, the method comprising:
the Node B receiving a capacity request from a radio network controller (RNC), the capacity request indicating an amount of data that the RNC has available to send to the Node B;
the Node B transmitting a capacity allocation to the RNC in response to the capacity request, wherein the capacity allocation is determined based on a channel quality index (CQI) transmitted by a wireless transmit/receive unit (WTRU) to the Node B in response to receiving data from the Node B; and
the Node B receiving an amount of data from the RNC that does not exceed the capacity allocation.
3. A radio network controller (RNC) comprising:
a transmitter configured to transmit a capacity request to a Node B, the capacity request indicating an amount of data that the RNC has available to send to the Node B; and
a receiver configured to receive a capacity allocation from the Node B in response to the capacity request, wherein the capacity allocation is determined based on a channel quality index (CQI) transmitted by a wireless transmit/receive unit (WTRU) to the Node B in response to receiving data from the Node B,
wherein the transmitter is further configured to transmit an amount of data to the Node B that does not exceed the capacity allocation.
4. A Node B comprising:
a receiver configured to receive a capacity request from a radio network controller (RNC), the capacity request indicating an amount of data that the RNC has available to send to the Node B; and
a transmitter configured to transmit a capacity allocation to the RNC in response to the capacity request, wherein the capacity allocation is determined based on a channel quality index (CQI) transmitted by a wireless transmit/receive unit (WTRU) to the Node B in response to receiving data from the Node B,
wherein the receiver is further configured to receive an amount of data from the RNC that does not exceed the capacity allocation.