HSUPA.pptx

8/11/2019 HSUPA.pptx

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Page1

HSUPA vs. HSDPAHSDPA HSUPA

New high-speed shared channel Dedicated channel with

enhanced capabilities

HARQ with fast retransmission at layer 1

Rate/modulation adaptation

Single serving cell

Fast power control

Soft handover

Fast NodeB scheduler

Shared NodeB power and code

Fast NodeB scheduler

Rise-over-Thermal (ROT)


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Rise-over-Thermal Noise

In order to decode received data correctly, theuplink interference shall be controlled.

Rise-over-Thermal is a measure of the uplinkload.

NodeB monitors uplink interference and tells UE

how much power can be used to transmit uplink data.


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NodeB Scheduler for HSUPA

The HSUPA scheduler considers the trade-offbetween the following two points: Several users those want to transmit at high

data rate all the time Satisfying all requested grants while preventing

overloading and maximizing resource utilization


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HSUPA Channel Operation (continued)

1. Transmission Request The UE request datatransmission by thescheduling information(SI), which is determinedaccording to the UEpower and buffer dataavailability.

The schedulinginformation is sent to theNodeB.

UE

UE Buffer UE Power

Scheduling Information (SI)


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2. Grant Assignment The Node B determines the

UE grant by monitoringuplink interference (RoT athe receiver), and byconsidering the UEtransmission requests andlevel of satisfaction.

The grant is signaled to theUE by new grant channels.

NodeB

RoT SI

GRANT

Satisfaction


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3. Data Transmission The UE uses the received

grant and, based on itspower and data availability,selects the E-DCH transportformat and thecorresponding transmitpower.

Data are transmitted by theUE on together with therelated control information.

UE

GRANTUE Power

Data and relatedcontrol information

UE Buffer


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4. Data Acknowledgment The NodeB attempts to

decode the received dataand indicates to the UEwith ACK/NACK.

If no ACK is received byhe UE, the data may be

retransmitted.

NodeB

ACK/NACK

Data and relatedcontrol information


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HSUPA Protocol StackSM (Session Management)

GMM (GPRS Mobility Management)

RRC (Radio Resource Control)

MAC-es and MAC-d (Medium Access Control)

RLC (Radio Link Control)

MAC-e

Physical LayerIub Interface

Iu Interface

UE NodeB RNC SGSN

AS

NAS


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New HSUPA Uplink Channels

Enhanced Uplink Dedicated Channel (E-DCH) Uplink Transport Channel

E-DCH Dedicated Physical Data Channel (E-

DPDCH) Uplink Physical Channel E-DCH Dedicated Physical Control Channel

(E-DPCCH) Uplink Control Channel


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New HSUPA Downlink Channels

E-DCH Hybrid ARQ Indicator Channel (E-HICH) Downlink Physical Channel

E-DCH Absolute Grant Channel (E-AGCH) Downlink Physical Channel

E-DCH Relative Grant Channel (E-RGCH)

Downlink Physical Channel


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HSUPA Channel MappingDCCH DTCH

E-DCH

E-DPCCH

E-DPDCH

E-HICHE-AGCH

E-RGCH


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Uplink Channels

E-DPDCH Carries the payload.

May include a scheduling request fromUE to NodeB.

E-DPCCH Carries control information required to

decode the payload carried by E-DPDCH.

Carries an indication from UE toindicate NodeB whether the assignedresources are adequate.

TTI

SIPayloadHD

TTI

ResourceStatus

ControlInformation


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Downlink Channels

E-AGCH The absolute grant carries maximum allowed E-

DPDCH/DPCCH power ratio.

Carries information that controls HARQ process.

E-RGCH The relative grant carries a simple command to

increase (UP), decrease (DOWN) or keep (HOLD) thecurrent grant.

E-HICH Gives feedback to the UE about previous datatransmission, carrying acknowledge (ACK) or notacknowledge (NACK).

TTI

HARQControlT/P Grant

TTI

Up/Down/Hold

TTI

ACK/NACK


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HSUPA Features

Shorter TTI of 2ms In HSUPA both 10ms TTI and 2ms TTI are

supported.

A shorter TTI allows reduction of the latencyand increasing the average and peak cellthroughput.

Higher Peak Data Rate For a 10-ms TTI UE, peak data rate is limited to 2

Mbps.

Higher peak data rates can be achieved with a

2ms TTI UE


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HSUPA Features (continued)

Hybrid-ARQ N-channel stop-and-wait protocol, with 4 HARQ

processes for 10ms TTI and 8 HARQ processesfor 2ms TTI

Synchronous retransmission Separate HARQ feedback is provided per radio

link.


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E-DCH Active Set and Mobility Support

There are three different types of radio

links in the UE E-DCH active set:

Serving E-DCH Cell: The cell from which

UE receives AGCH.

Serving E-DCH RLS: Set of cells that

contain at least the serving cell and from

which the UE can receive RGCH

No-Serving RL: Cell that belongs to the E-

DCH active set but not belong to theserving RLS and from which the UE can

receive a RGCH.

ServingE-DCH cell

Serving E-DCHRadio Link Set

(RLS)

Non-ServingE-DCH Radio

Link (RL)


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Theoretical HSUPA Maximum Data Rate

How to get 5.76Mbps: Lower channel coding gain

Effective code rate = 1

Requires very good channel conditions to decode

Lower spreading factor

UE uses SF 2 Multi-code transmission

UE uses 4 codes, 2 with SF2 and 2 with SF4

2ms TTI


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E-DPDCH with SF4 and Puncturing

Maximum payload for spreading factor of 4, TTI of 2 ms and coding rateof 1 is 1920 bits and the corresponding data rate is 960kbps.

1920 bits payload

1920 parity

1920 symbols

1920 modulationsymbols

1920 systematic 1920 parity

7690 chips

R = 1/3Turbo Coding

SF=4

BPSK Modulation

Puncturing

2ms


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Lower Spreading Factor SF2

Maximum payload for spreading factor of 2, TTI of 2 ms and coding rateof 1 is 3840 bits and the corresponding data rate is 1920kbps.

3840 bits payload

3840 parity

3840 symbols

3840 modulationsymbols

3840 systematic 3840 parity

7690 chips

R = 1/3Turbo Coding

SF=2

BPSK Modulation

Puncturing

2ms


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Multi-code Transmission

For one UE in HSUPA operation, up to 4 E-DPDCH can be used simultaneously, twousing SF4 and two using SF2.

Use of 4 codes transmission 2*SF2 + 2*SF4: (2*1920kbps) + (2*960kbps) = 5760kbps


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HSUPA UE CapabilitiesE-DCH

category

Max number

of E-DPDCH

channels

Minimum

SF

Supported

TTI

Peak rate

for TTI =

10MS

Peak rate

for TTI =

2ms

Category 1 1 SF4 10ms 711kbps --

Category 2 2 SF4 2&10 ms 1448kbps 1448kbps


Category 4 2 SF2 2&10 ms 2000kbps 2886kbps


Category 6 4 SF2 2&10ms 2000kbps 5742kbps


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New Channels for HSUPA

Uplink Transport Channel E-DCH: Carries high speed uplink data

Uplink Physical Channels E-DPDCH: Carries E-DCH

E-DPCCH: Carries control signal for E-DPDCH

Downlink Physical Channels E-HICH: Carries HARQ ACK/NACK indicator for E-DCH

E-RGCH: Carries relative grant determined by the scheduler E-AGCH: Carries absolute grant determined by the

scheduler


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New Channels in HSUPA Operation 1. The UE sends a request for resources. The

request includes status of its data buffers and issent on E-DPDCH.

2. Based on the request from the UE, the Node Ballocates a resource grant to the UE. The grant is

sent on the E-AGCH channel. 3. This grant can be modified by the Node B every

TTI using the E-RGCH channel.

4. The UE transmits data on E-DPDCH. Controlinformation needed to decode the data is sent on

E-DPCCH. 5. The Node B decodes the received packet and

informs the UE whether it could decode the datasuccessfully or not on the E-HICH channel.

E-DPDCHE-DPCCH

E-AGCH

E-RGCHE-HICH

1

4

3 521

4


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E-DCH

E-DCH is mapped to one or more E-DPDCHs. Control information for E-DCH is sent to E-

DPCCH.

One transport block (TB) is transferred in oneTTI.

Transmission time interval (TTI) can be 10msor 2ms.

Support for 10ms is mandatory in the UE. Support for 2ms is mandatory for UE with E-DCH

peak capability above.


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E-DCH Channel Coding

CRC A 24 bit CRC is

attached to thetransport block.

Channel Coding Turbo coding with 1/3

coding ratio

Transport blockfrom MAC

Add CRCattachment

Code blocksegmentation

Channel coding

Physical layer HARQ/rate matching

Physical channelsegmentation

Interleaving & physicalChannel mapping

Physical channel(s)


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E-DCH HARQ Rate Matching

Hybrid HARQ/Rate Matching Hybrid ARQ match the number of bits at the turbo

coder to the total number of bits available in theE-DPDCH(s).

Redundancy Version (RV) controls rate matching.


Add CRCattachment


Channel coding




Physical channel(s)

Bitseparation

RM_S

BitcollectionRM_P1

RM_P2

Systematicbits

Parity 1bits

Parity 2

bits


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E-DCH Interleaving

Physical Channel Segmentation To distribute bits among

multiple E-DPDCH when more

than one E-DPDCH is used. Interleaving

The same as UL DCH interleaving

Channel Mapping If more than one E-DPDCH is

used, the bits should be mappedto different E-DPDCHs.


Add CRCattachment


Channel coding




Physical channel(s)


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E-DPDCH I/Q Channel Mapping

E-DPDCH 1

E-DPDCH K

E-DPCCH

.

.

.

Channelizationcode

Gain factor

I + jQ

Scramblingcode

IQk Nmax-dpdch

HS-DSCHconfigured E-DPDCH K IQ k

0 NO/YES E-DPDCH 1 I

E-DPDCH 2 Q

E-DPDCH 3 I

E-DPDCH 4 Q

1 NO E-DPDCH 1 Q

E-DPDCH 2 I

1 YES E-DPDCH1 I

E-DPDCH 2 Q

E-DPDCH k is mapped to I brand or

Q brand according to IQ k.

E-DPCCH is always mapped to I

branch.


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E-DPCCH

E-DPCCH is always transmitted on uplinkwith E-DPDCH. Always transmitted with E-DPDCH

simultaneously. E-DPCCH includes:

RSN: Uplink HARQ transmission number

E-TFCI: E-DCH transport format combinationindicator Happy Bit: for support of scheduling

Channelization code for E-DPCCH is C

ch,256,1


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E-DPCCH Coding

Data in one E-DPCCHsubframe RSN: 2 bits

E-TFCI: 7 bits Happy bit: 1 bit

For 10ms TTI, the same

coded bit sequence istransmitted in 5 sub-frames.

Multiplexing

Channel Coding

Physical channel mapping

one E-DPCCH subframe

RSN E-TFCI Happy bit

10 bits

30 bits


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E-DPCCH Coding (continued)

RSN bits in E-DPCCH are used to indicate the type of redundancyversion (RV) of each HARQ transmission and to aid in soft buffermanagement at the NodeB.

RSN = 0: First transmission

RSN = 1: Second transmission RSN = 2: Third transmission

RSN = 3: Additional transmission

RV selection rules:

UTRAN can configure the UE to use RV = 0 for all transmissions. Or UTRAN can configure the UE to use RSN to change RV.


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E-DPCCH & E-DPDCH FrameFormat

Slot 0 Slot 1 Slot 3 Slot i Slot 14

10 bits

Data, N data bits

1 subframe = 2ms

1 frame = 10ms

E-DPDCH

E-DPCCH

2560 chips

2560 chips, N data = 10*2k bits (k = 07)


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E-AGCH

E-AGCH is a common downlink channel.

Fixed data rate: 30kbps

QPSK modulation

Spreading factor: 256

E-AGCH carries absolute grant for E-DCH for all UEs in the cell.

Transmission on E-AGCH can be 2ms or 10ms.

2ms if E-DCH TTI is 2ms

10ms if E-DCH TTI is 10ms

UE listens to the E-AGCH from the serving cell only.


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E-AGCH Coding Multiplexing

5 bits for the absolute grant values 1 bit (X ags ) for the scope of the grant

CRC

16 bits CRC is masked with E-RNTI

E-RNTI is used to address UE.

Channel Coding

Rate 1/3 convolutional coding

Rate Matching

Puncturing to get 60 bits from 90 bits generated afterchannel coding

Physical Channel Mapping

60 bits mapped to one subframe (20 bits per slot)

For 10ms TTI, same bits get repeated for all 5 subframe

Multiplexing

ID specificCRC attachment

Channel coding

Rate matching

Physical channelmapping

5 bits grant 1 bit scope

One E-AGCH subframe

6 bits

22 bits

90 bits

60 bits


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E-AGCH Frame Format

Slot 0 Slot 1 Slot 3 Slot i Slot 14

20 bits

1 subframe = 2ms

1 frame = 10ms

E-AGCH

2560 chips


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E-HICH

E-HICH is a dedicated downlink channel that carries HARQ ACK/NACK. QPSK modulation Spreading factor is 128 and the channelization code for E-HICH is same

with E-RGCH.

Transmitted from all cells in the E-DCH active set.

ACK/NACK is indicated using a binary indicator. ACK is +1. NACK from cells in serving E-DCH radio link set is -1. NACK from cells not in serving E-DCH radio link set is 0 (DTX).


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E-RGCH & E-HICH Coding Same channelization code C ch,128,k

Different signature sequences, C ss,40,m(i) and C ss,40,n(i) for slot i

S/p

Q

PSK

1/0/-1(UP/HOLD/DOWN)

C ss,40,m(i)

40 bits/slot

j

C ch,128,k

Scrambling G RGCH

S/p

Q

PSK

1/(-1 or 0)(ACK/NACK)

C ss,40,n(i)

40 bits/slot

j

C ch,128,k

Scrambling G HICH

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HSUPA.pptx