owj200005 hsupa principle issue 1.0

8/13/2019 Owj200005 Hsupa Principle Issue 1.0

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Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.

HSUPA Principle



Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved. Page2

Contents

1. Overview

2. Key technologies

3. HSUPA Channel

4. HSUPA RRM




Overview

HSUPA: High Speed Uplink Packet Access

3GPP has not defined HSUPA in R6 specification, but

enhanced dedicated channel (E-DCH). Usage of the term

„HSUPA‟ instead of E -DCH follows the trend of the „HSDPA‟.




Overview

HSUPA provides a flexible way to make uplink data rate

exceed 384kbps, which is the maximum uplink data rate in

R5

Fast uplink hybrid-ARQ (HARQ), Node B based uplinkscheduling and easier multi-code transmission are adopted

in HSUPA




Contents

1. Overview

2. Key technologies

3. HSUPA Channel

4. HSUPA RRM


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Key Technologies

E-DCH

The central feature of HSUPA is a new uplink transport

channel, E-DCH, just like HS-DSCH of HSDPA

E-DCH supports fast Node B based scheduling, fast physicallayer HARQ, multi-code transmission and shorter (2ms)

transmission time interval (TTI)




Key Technologies

E-DCH

Unlike HS-DSCH of HSDPA, E-DCH is not a shared channel,

but a dedicated one

Structure of E-DCH is similar to the DCH of R99. Each UE hasits own dedicated E-DCH data path to the Node B which is

continuous and independent from E-DCHs of other UEs




Key Technologies

Comparison of DCH,HS-DSCH &E-DCH




Key Technologies

L1 HARQ




Key Technologies

L1 HARQ

As the link direction is different in HSUPA, the soft buffer is

maintained by the Node B instead of the terminal

The terminal will keep unacknowledged data in memory, andthe MAC layers trigger retransmission if the physical layer

received a NACK from the Node Bs in the E-DCH active set




Key Technologies

Fast Scheduling

HSDPA moved downlink scheduling from the RNC to the Node

B in order to make scheduling decisions with minimum latency.

HSUPA scheduling does the same thing for the uplink and

moves the scheduling to the Node B

HSDPA scheduling is “one -to- many”, but HSUPA scheduling is

“many -to- one”. They are totally different




Key Technologies

Fast Scheduling




Key Technologies

Fast Scheduling

The primary task of uplink scheduler is to ensure that overload

does not occur

The secondary task is to try and use as much of the uplinkcapacity as possible without running the risk of the cell

becoming overloaded




Key Technologies

Multi-code Transmission




Key Technologies

Variable Short TTI

HSDPA only supports a single TTI (2 ms).

HSUPA can support two TTI lengths (2ms and 10 ms).




Key Technologies

Variable Short TTI




Contents

1. Overview

2. Key technologies

3. HSUPA Channel

4. HSUPA RRM




HSUPA Channel

Channels for HSUPA operation




HSUPA Channel

E-DPDCH

After transport channel processing, the E-DCH maps to one or

multiple parallel new dedicated physical data channels – E-

DPDCHs

E-DPDCH is a new uplink physical channel used for

transmitting service data from the UE to the Node B




HSUPA Channel

Comparison of DPDCH and E-DPDCH




HSUPA Channel

E-DPDCH Frame Structure




HSUPA Channel

E-DPCCH

E-DPCCH is a new uplink physical channel used for

transmitting information about E-DPDCH from the UE to the

Node B

E-DPCCH is a new channel that exists parallel to all uplink

dedicated channels of 3GPP R5 (DPDCH, DPCCH and HS-

DPCCH), and always accompanies E-DPDCH




HSUPA Channel

E-DPCCH Slot Format




HSUPA Channel

E-DPCCH Frame Structure




HSUPA Channel

E-DPCCH Frame Structure

The 10 information bits on the E-DPCCH TTI consist of three

different segments

E-TFCI ( E-DCH Transport Format CombinationIndicator ,7bits )

RSN ( Retransmission Sequence Number ,2bits )

Happy bit (1bit )




HSUPA Channel

E-HICH

E-DCH HARQ indicator Channel (E-HICH) is a new downlink

physical channel used for transmitting positive and negative

acknowledgements for uplink packet transmission

If the Node B received the transmitted E-DPDCH TTI correctly

it will respond with a positive acknowledgement (ACK) and if it

received the TTI incorrectly it will respond with a negative

acknowledgement (NACK)




HSUPA Channel

ACK/NACK mapping to E-HICH




HSUPA Channel

E-HICH Frame Structure




HSUPA Channel

E-RGCH

E-DCH relative grant channel( E-RGCH ) is a new downlink

physical channel used for transmitting single step (up/down)

scheduling commands

The commands sent by E-RGCH will affect the relative

transmission power the UE is allowed to use for data channel

transmission (E-DPDCH), thus effectively adjusting the uplink

data rate up/down




HSUPA Channel

Message mapping to E-RGCH




HSUPA Channel

Multiplexing of E-RGCH & E-HICH




HSUPA Channel

E-AGCHE-DCH absolute grant channel (E-AGCH) is a new downlink

physical channel used for transmitting an absolute value of the

Node B scheduler‟s decision

E-AGCH tells UE the relative transmission power it is allowed

to use for E-DPDCH, then UE will know the maximum

transmission data rate it may use




HSUPA Channel

Content of E-AGCHThe information bits on the E-AGCH TTI consist of three

different parts:

Absolute grant value ( 5bits ) Absolute grant scope ( 1bit )

Primary/Secondary UE ID (16bit )




Contents

1. Overview

2. Key technologies

3. HSUPA Channel

4. HSUPA RRM




HSUPA RRM

HSDPA & HSUPA Radio Interface for User Data




HSUPA RRM

HSUPA User Plane Protocol Architecture




HSUPA RRM

New Functionality of HSUPA




HSUPA RRM

RRM Functional Block of HSUPA




HSUPA RRM

Resource Allocation in RNC




HSUPA RRM

QoS Mapping in RNCRNC sends a lot of QoS parameters to Node B, which can be

used in packet scheduling

Scheduling priority indicator ( SPI )

MAC-es guaranteed bit rate ( GBI )

Maximum number of transmissions for HARQ




HSUPA RRM

Admission Control in RNC Admission control decides whether or not to admit a new user toHSUPA. The decision is based on the following information

Number of active HSUPA users

Uplink interference levelsScheduling priority indicator

Guaranteed bit rate

Provided bit rate on the E-DCH

Provided bit rate on the DCHDownlink limitations




HSUPA RRM

Mobility Management in RNC




HSUPA RRM

Packet Scheduling in Node B




HSUPA RRM





HSUPA RRM

Scheduling in Soft Handover




HSUPA RRM

L1 HARQ in Node BL1 HARQ schemes has 3 main advantages:

Retransmissions are faster at L1 in HSUPA than L2 RLC-

based retransmissions in Release 99

Soft combining of retransmissions can be used in HSUPA

Spectral efficiency will be improved, since UE is able to

operate at a higher BLER without increasing the delay




HSUPA RRM

L1 HARQ in Soft Handover




HSUPA RRM

HSUPA Terminal Categories



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