HSUPA introduction

Content

Feature Description Function Introduction HSUPA channel HSUPA key techniecue

What’s HSUPA

The HSUPA feature is in fact a new uplink transport channel–E-DCH that brought some of the same features to the uplink as the HSDPA

HSUPA main technique

L1 HARQ Fast NodeB based scheduling Shorter TTI Higher SF Multiple code transmission

HSUPA comparison with R99&HSDPA

feature DCH HSDPA HSUPA

Variable SF Y N Y

AMC N Y N

BTS based scheduling N Y Y

Fast L1 HARQ N Y Y

Soft Handover （ traffic）

Y N Y

TTI 10,20,40,80ms 2ms 10,2ms

HSUPA basic principle

HSUPA protocol architecture

PHY PHY

EDCH FP EDCH FP

Iub UE NodeB Uu

DCCH DTCH

TNL TNL

DTCH DCCH

MAC-e

SRNC

MAC-d

MAC-e

MAC-d

MAC-es / MAC-e

MAC-es

Iur

TNL TNL

D RNC

RNC MAC-es function Re-arrngement queue

Routing different MAC-es PDU to re-arrangement buffer according to SRNC configuration.

re-order According to TSN and Node B identification （ CFN,

subframe number ） re-order MAC-es PDU.

macro diversity unpack

unpack MAC-es PDU ， delete MAC-es header to get MAC-d PDU

NodeB MAC-e function

E-DCH scheduling ： Used for schedule E-DCH radio resource between different UE

E-DCH control ： Used for receive schedule requirement and send schedule

command;

De-multiplexing： De-multiplex MAC-e PDU and send MAC-es PDU to related MAD-

d flow

HARQ: One HARQ entity can support multiple SAW HARQ process, each

process are used to generate ACK/NACK which are used to indicate if E-DCH data are received correctly.

Content

Feature Description Function Introduction HSUPA channel HSUPA key techniecue

E-DCH

E-DCH （ Enhanced Dedicated Channel） E-DCH could support both 2 ms and 10 ms. E-DCH could support multiple codes transmission. E-DCH and DCH use independent CCTRCH When DCH and E-DCH concurrent the MBR of UL DCH is

64 Kbps.

HSUPA UE category

HSUPA channel

SRNC DRNC

MAC-es FP

MAC-d

NodeBs Iur/Iub FP

Scheduler

MAC-e

NodeBd FP

MAC-e

UE

MAC-e/ MAC-es

MAC-d

DTCHs

E-DPDCH E-DPCCH

E-AGCH (Absolute Grants, "E-RNTI" -> UE)

serving cell

E-HICH (ACK/NACKs) E-RGCH (relative grants) (ChCode, signature -> UE)

MRC MRC

1 TNL bearer per MAC-d flow

Iur/Iub FP

E-AGCH

E-AGCH used for E-DCH absolute grant, each HSUPA user has only one E-AGCH channel

SF ＝ 256 ， AG are used to provide UE UL resource limitation

E-AGCH only transmit in serving cell.

E-RGCH

Relative Grant can be transmitted in 3,12,or 15 continuous TS.

In serving E-DCH RLS RG could be +1 、 0 or -1; In no serving E-DCH RLS RG could be 0 or -1.

3TS Cell belong to Serving E-DCH RLS 2ms

12 TS Cell belong to Serving E-DCH RLS 10 ms

15 TS Cell belong to no Serving E-DCH RLS

E-HICH

E-HICH used to transmit E-DCH HARQ ACK/NACK, SF=128

E-HICH used the same DL OVSF code with E-RGCH, The High layer signaling will separate them.

The HARQ ACK/NACK indication is transmitted in 3 or 12 continuous TS, 3TS for 2ms TTI, 12 TS for 10ms TTI.

E-HICH transmition If the E-HICH is coming from the radio link set contained in

the serving E-DCH radio link (transmitted from the base station that has the serving E-DCH cell),then both ACKs and NACKs are transmitted. The E-HICHs transmitted by NodeBs that do not contain the serving E-DCH cell only transmit ACKs.If such a cell does not receive the E-DPDCH TTI correctly,then it does nothing.The UE will continue retransmitting until at least one cell responds with an ACK

E-DPDCH/E-DPCCH E-DPDCH used to transmit E-DCH ， SF2 ～ 256 E-DPCCH used to transmit E-DCH relative control info (E-

TFCI,RSN,Happy Bit) ， SF=256

E-TFCI,the E-DCH transport format combination indicator of 7bits indicating the transport format being transmitted simultaneously on E-DPDCHs.

RSN,there transmission sequence number of 2bits informing the HARQ sequence number of the transport block currently being sent on E-DPDCHs.The initial transmission of a transport block is sent with RSN=0,the first with RSN=1,the Second with RSN=2,and all subsequent transmissions with RSN=3.

Happybit is1bit only.It indicates whether the UE is content with the current data rate or relative power allowed to be used for E-DPDCHs or whether it could use higher power allocation.

E-DPDCH slot format

E-DPCCH slot format

E-TFCI: the transmission format combination indicator of the E-DCH channel (7bit)

RSN: HARQ retransmission sequence number (2bit) Happy Bit: scheduling feedback bit from the UE (1bit)

Content

Feature Description Function Introduction HSUPA channel HSUPA key techniecue

HSUPA scheduling

HSUPA fast scheduling Fast L1 HARQ

HSUPA scheduler

UE

HSUPAScheduler E-RGCH

E-AGCH

E-HICH

Downlink

E-DCHDe-mux HARQ

Associated Uplink Schedule

Information

RNC

ACK/NACK

Uplink Processing

AG

RG

NodeB

Uu

Uu

Uu

Uu

lub

HSUPA scheduler

HSUPA

PS Scheduler

RNC->:

MaxRTWP, RefRTWP

NServToTotalPwr

NodeB->:RTWPcurrent,

CE resource

UE->: SI, HappyBit

UE:AG, RG,

RNC->: UE QoS parameters：

SPI，GBR，

Non-scheduled BitRate

Uplink processing uni t ->:

E-TFCI, Eb/No，DPCCH SIR

HSUPA scheduling

HSUPA sheduling is done by 3 physical channel, E-AGCH, E-RGCH and happy bits in E-DPDCH.

There is also SI IE in MAC-e header of E-DPDCH,which contained optional detailed message used for NodeB sheduler. Only when data volume in buffer increased or counter expired triggered SI transmission, and sheduled HSUPA cell received datagram correctly which means SI could be used.

HARQ

SAW HARQ HARQ process number is related to TTI number, 2ms TTI

has 8 process ， 10ms TTI has 4 process 。 For UE scheduling and un-scheduling we could define specific process to transmit.

Use HARQ E-DCH support intra-Node B and inter Node B macro-diversity。

HARQ meassage

ACK/NACK IE This IE is tranmited in DL E-HICH to notify if trasport

block is received correctly.

RSN This IE is transmitted in E-DPDCH to notify HARQ

sequence number of transport block on E-DPDCH.