Hsdpa Flow Control Data Frame, Frame Sequence Number

摘要

A radio base station (RBS) is described herein that detects when a high-speed downlink shared channel (HS-DSCH) data frame ( 110 ) is lost after it was transmitted by a radio network controller (RNC) over a transport link (Iub) towards the RBS ( 104 ). To accomplish this, the RBS ( 104 ) upon receiving a HS-DSCH data frame ( 110 ) inspects a frame sequence number ( 302 ) located within the received HS-DSCH data frame ( 110 ) to determine if the frame sequence number ( 302 ) is in sequence with a frame sequence number ( 302 ) located within a previously received HS-DSCH data frame ( 110 ). If the two frame sequence numbers ( 302 ) are not in sequence, then one or more HS-DSCH data frames ( 110 ) that were previously transmitted towards the radio base station ( 104 ) have been lost. If the radio base station ( 104 ) detects to many lost HS-DSCH data frames ( 110 a), then it can correct the problem by reducing the bit rate of a certain HS user flow or by reducing the maximum bit rate for all of the HS traffic which is going to be sent by the radio network controller ( 102 ) over the transport link ( 106 ) to the radio base station ( 104 ).