HSUPA E-DPCCH

As DPCCH carries the information required to decode DPDCH in R99, E-DPCCH carries the information required to decode E-DPDCH in HSUPA. E-DPCCH carries 10 bits structured as follows.

< E-TFCI >

It stands for "E-DCH Transport Format Combination Indicator" and indicates the transport format being transmitted simultaneously on E-DPDCHs. The E-TFCI tells the receiver the transport block size coded on the E-DPDCH. From this value, the reciever (Node B) can figure out how many E-DPDCHs are transmitted in parallel and what spreading factor is used.

< RSN >

It stands for Retransmission Sequence Number meaning as follows :

• 00 : New Transmission
• 01 : First Retransmission
• 10 : Second Retransmission
• 11 : Higher than Second Retransmission

< Happy bit >

It carries the information whether the UE is content with the current data rate (Grant) allocated by the network or not.

• 1 : indicate "Happy".  It means that the Grant is large enough to transmit all the data within a certain time frame.
• 0 : indicate "Unhappy". It means that the Grant is NOT large enough to transmit all the data within a certain time frame.