3G/UMTS

  

 

 

 

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 (7 bits)

RSN (2 bits)

Happy bit (1 bit)

 

< 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.