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 Node B, the method comprising:
determining an amount of data that at least one buffer of the Node B may accept;
transmitting an authorization to transmit at most the determined amount of data; and
receiving at most the determined amount of data based on the authorization.
2. The method of claim 1 , wherein the at least one buffer comprises a plurality of buffers or sub-buffers.
3. The method of claim 1 , further comprising;
receiving a channel quality index (CQI); and
determining the authorization based on the CQI.
4. The method of claim 3 , wherein the CQI is transmitted by a wireless transmit/receive unit (WTRU) to the Node B in response to receiving data from the Node B.
5. The method of claim 3 , further comprising;
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, wherein the Node B transmits the authorization to the RNC in response to receiving the capacity request.
6. A Node B comprising:
at least one buffer;
a processor configured to determine an amount of data that the at least one buffer may accept;
a transmitter configured to transmit an authorization to transmit at most the determined amount of data; and
a receiver configured to receive at most the determined data based on the authorization.
7. The Node B of claim 6 , wherein the at least one buffer comprises a plurality of buffers or sub-buffers.
8. The Node B of claim 6 , wherein the receiver is further configured to receive a channel quality index (CQI), and the processor is further configured to calculate the authorization based on the CQI.
9. The Node B of claim 8 , wherein the CQI is transmitted by a wireless transmit/receive unit (WTRU) to the Node B in response to receiving data from the Node B.
10. The Node B of claim 6 , wherein the receiver is further 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, wherein the transmitter is further configured to transmit the authorization to the RNC in response to receiving the capacity request.