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 of operating a wireless communication system including a Node-B controlled by a radio network controller (RNC), the method comprising:
determining, by the Node-B, a loss of data;
determining, by the Node-B, an amount of data that at least one buffer in the Node-B may accept; and
transmitting, by the Node-B to the RNC, a capacity allocation message, the capacity allocation message being derived from the determined amount of data and the determined loss of data.
2. The method of claim 1 , further comprising receiving, at the Node-B from the RNC, an amount of data equal to or less than the capacity allocation.
3. The method of claim 1 , further comprising transmitting, by the RNC to the Node-B, an amount of data equal to or less than the capacity allocation.
4. The method of claim 1 , further comprising:
determining a back-up, wherein the capacity allocation message is further derived from the determined back-up.
5. The method of claim 1 , wherein the at least one buffer comprises a plurality of buffers or sub-buffers.
6. The method of claim 1 , wherein the capacity allocation is further based on a selected quality indicator.
7. The method of claim 6 , wherein the selected quality indicator is received from a wireless transmit/receive unit (WTRU).
8. The method of claim 1 , further comprising:
receiving, at the Node-B from the RNC, a capacity request indicating an amount of data that the RNC has available to send to the Node B, wherein the capacity allocation is transmitted by the Node-B to the RNC in response to the received capacity request.
9. A Node-B comprising:
a processor;
a transceiver;
at least one buffer; and
wherein the processor is configured to:
determine a loss of data;
determine an amount of data that the at least one buffer may accept; and
cause the transceiver to transmit a capacity allocation message to a radio network controller (RNC), the capacity allocation message being derived from the determined amount of data and the determined loss of data.
10. The Node-B of claim 9 , wherein the transceiver is configured to receive, from the RNC, an amount of data equal to or less than the capacity allocation.
11. The Node-B of claim 9 , wherein the processor is further configured to determine a back-up, wherein the capacity allocation message is further derived from the determined back-up.
12. The Node-B of claim 9 , wherein the at least one buffer comprises a plurality of buffers or sub-buffers.
13. The Node-B of claim 9 , wherein the capacity allocation is further based on a selected quality indicator.
14. The Node-B of claim 13 , wherein the selected quality indicator is received from a wireless transmit/receive unit (WTRU).
15. The Node-B of claim 9 , wherein the transceiver is further configured to:
receive, from the RNC, a capacity request indicating an amount of data that the RNC has available to send to the Node B, wherein the capacity allocation is transmitted by the Node-B to the RNC in response to the received capacity request.