Wcdma Ran11 Hspa+ Features

7/27/2019 Wcdma Ran11 Hspa+ Features

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WCDMA RAN11 HSPA+

Features



HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 2

Upon completion of this course, you will be able to：

Know new features of HSPA+ in RAN11

Learn the principles and configurations of the new

features




References

《RAN11.0 Feature Parameter Description》

《25.899》

《25.308》

《25.211》




Abbreviations

CQI Channel quality indication

H-RNTI HSPA random network temporary identifier

MBMS Multimedia broadcasting and multicast service

PTP/PTM

Point to point / point to multipoint

CPC Continuous packet connectivity

TPC Transmit power control

TB Transport block

RTT Round trip time

MIMO Multi input multi output




Preface

HSDPA is introduced in R5, downlink 14.4Mbps is supposed to be

supported

HSUPA is introduced in R6, uplink 5.73Mbps is supposed to be

supported

Key technology of HSDPA includes 2ms frame, AMC and HARQ, etc.

Key technology of HSUPA includes 2ms frame and HARQ, etc.

In RAN10 and earlier version, HSPA Phase1 and Phase 2 is

implemented, supporting the features mentioned above

HSPA+ is introduce in R7, which is implemented in RAN11, supporting

enhanced L2, CPC, 64QAM, MIMO and enhanced CELL-FACH, etc.




Chapter 1 RAN11 L2 enhancement

Chapter 2 RAN11 CELL-FACH enhancement

Chapter 3 RAN11 CPC feature

Chapter 4 RAN11 other features of HSPA+






Background of L2 enhancement

In RAN10, RLC PDU size is fixed, this will cause padding and PDU

multiplexing, and brings too much overhead information

Possible solution is:

Bigger window size, but this will damage the efficiency because MAC-hs

will multiplex more RLC PDU which brings more overhead information

Flexible PDU size, larger size is a good way for higher data rate, and

smaller size is good for UE which is far from the NodeB

Shorter RTT, but this is not controllable




L2 enhancement in RAN11

RAN11 Implementation:

Flexible PDU size in RLC (AM) layer

MAC-ehs is introduced in MAC layer

Flexible PDU Size

RLC AM support fixed size and flexible size

In case of flexible size, maximum RLC size is 1500 byte,

corresponding 12032bits of MAC-d PDU





MAC-ehs

High layer could configure MAC-ehs or MAC-hs

MAC-ehs supports flexible RLC PDU sizes

MAC-ehs supports segmentation and reassemble

MAC-ehs supports MIMO





The MAC-ehs SDUs included in a MAC-ehs PDU can have a different size

and a different priority and can be mapped to different logical channels.

MAC-ehs

MAC – Control

HS-DSCH

TFRC selection

Priority Queuedistribution

Associated DownlinkSignalling

Associated Uplink

Signalling

MAC-d flows

PriorityQueue

Scheduling/Priority handling

PriorityQueue

PriorityQueue

Segmentation

Segmentation

Segmentation

Priority Queue MUX

HARQ entity

MAC-hs

MAC – Control

HS-DSCH

TFRC selection


Associated Downlink Associated UplinkSignalling

MAC-d flows

HARQ entity


PriorityQueue

PriorityQueue

PriorityQueue

PriorityQueue

Scheduling/Priority handling

MAC-hs (25.321-830) MAC-ehs（25.321-830)





64QAM, MIMO and E-FACH is based on L2 Enhancement

MML commands:

ADD CELLALGOSWITCH

− HspaPlusSwitch to enable L2ENHANCED











Enhanced CELL-FACH state

The HS-DSCH reception in CELL_FACH state is enabled by the UTRANby including the parameters for HS-DSCH reception in CELL_FACH

state in the system information broadcast

For uplink transmission the UE shall use the RACH





In protocol point of view

HS-DSCH

Associated Uplink

Signallingssociated Downlink

ignalling

FACH RACH

DCCH DTCHDTCH

DSCH

MAC Control

Iur or local

MAC Control

DCH DCH

MAC-d

USCHTDD only

MAC-c/sh

CPCHFDD only

CCCH CTCHBCCH SHCCHTDD only

PCCH

FACHPCH USCHTDD only

DSCHIub

MAC Control

MAC-ehs

Configuration without MAC-c/sh

Configuration with MAC-c/sh

Configuration with MAC-c/sh

Figure 1, from 25.308-770





Advantages of ECELL-FACHHigher data rate is possible in Non CELL-DCH state

Quicker state transition from Cell-FACH to Cell-DCH

No interruption of receiving data for the UE when transit from Cell-

FACH to Cell-DCH





ECELL-FACH state in RAN11:UE does not transmit ACK/NACK and CQI, UTRAN may set fixed

times of retransmit to improve reliability

UE reports the quality of downlink CPICH on RACH to RNC, RNC

sends the measurement result to NodeB in HS-DSCH data frames,

then NodeB could schedule the modulation and transmit power

ECELL-FACH related parameters is broadcasted in system

information block sib5/sib5bis/sib6, including HS-SCCH、HS-

PDSCH、common H-RNTI parameters





UE behavior in ECELL-FACH state: If ECELL-FACH parameters is broadcasted, the UE which support E-

FACH should use E-FACH state instead of CELL-FACH whenever

possible

UTRAN（SRNC）can acquire the UE capability of E-FACH in the RRC

setup request message, and DRNC may acquire the UE capability of E-

FACH in the cell update message

UE can’t receive HS-DSCH and SCCPCH at the same time（an exception

is the MBMS PTM）




MML Commands and Parameters

ADD CELLALGOSWITCHHspaPlusSwitch to enable both EFACH and L2ENHANCED

SET RRCESTCAUSE

EFachSwitch is on

SET CORRMALGOSWITCH

MapSwitch to enable MAP_PS_BE_ON_E_FACH_SWITCH and

other service

ADD CELLEFACH / ACT CELLEFACH

SET UESTATETRANS











CPC technology

Continuous packet connectivity (CPC), enables packet data users to avoidfrequent packet connection re-establishment, thus resulting in less

overhead and improving system efficiency

CPC includes several new features：

A new UL DPCCH slot format;

DTX-DRX:

− UL DTX;

− DTX_DRX;

HS-SCCH less Operation;




A New UL DPCCH Slot Format

A new slot format

slot format 4, each slot carries 6 pilot bits and 4 TPC bits

Compared with slot format 1, less pilot information is

transmitted

The advantage:

In times of no data transmission, with more TPC

information and less pilot, DPCCH may transmit with less

power Slot

Format #i

Channel Bit

Rate (kbps)

Channel

Symbol Rate

SF Bits/

Frame

Bits/

Slot

Npilot NTPC NTFCI NFBI Transmitted

slots per frame

1 15 15 256 150 10 8 2 0 0 8-15

4 15 15 256 150 10 6 4 0 0 8-15




DTX-DRX

DTX_DRX consists of 2 parts, they are UL DTX and DL DRX

DL DRX could be applied only when UL DTX is enabled.

Basic principle of DTR-DRX

By transmitting and receiving data on a pre-configured discontinuous

frame pattern, UE and NodeB could save power on the slot whenthere is no data, thus decrease uplink interference and UE power

consuming while still maintaining the physical channel synchronization




Uplink DTX

When there is no transmission on EDCH or HS-DPCCH, UE will stop

continuous DPCCH transmitting, but follow a pre-configured pattern to

transmit unsuccessively for maintaining physical sync.

2 types of DTX pattern could be configured

2ms, E-DPDCH/E-

DPCCH sub-frame

10ms, E-DPDCH/E-DPCCH radio frame

UE_DTX_cycle_1

UE_DTX_cycle_2

CFN

Inactivity_Threshold_for_UE_DTX_cycle_2

UE_DTX_cycle_2

E-DCH

transmission,

2ms TTI

Uplink DPCCH

burst pattern




DL DRX

DL DRX could be activated only when uplink DTX is activated,

DL DRX pattern should preconfigured for HS-SCCH, HSUPA control

channels (AGCH/RGCH), and F-DPCH

For F-DPCH

When uplink DPCCH is discontinuous transmitting, in the gap slot,NodeB can’t get TPC bit, F-DPCH will not change its transmitting

power, in the corresponding slot, F-DPCH is not required to send

downlink TPC either.




HS-SCCH less Operation

The HS-SCCH-less HS-DSCH transmission is a mechanism whereby thefirst HS-DSCH transmission of small transport blocks on predefined HS-

DSCH is performed without the accompanying HS-SCCH, this is

applicable to low data rate service such as VoIP, AMR service.

The modulation used is restricted to QPSK

Only 4 pre-defined TB formats for MAC-hs or MAC-ehs PDUs are

allowed

At most two pre-defined HS-PDSCH OVSF codes are assigned per

UE

At anytime, the UE may receive an HS-SCCH-less HS-DSCH

transmission on one or two of the configured codes and must perform

blind decoding on all 4 configured formats.




UE state transition in HSPA+

After supporting CPC and E-FACH, UE state could be in these states:

Non CPC supporting CELL-DCH: CELL-DCH

CPC supporting CELL-DCH: CELL-DCH(CPC)

Non E-FACH supporting CELL-FACH: CELL-FACH

E-FACH supporting CELL-FACH: eCELL-FACH

New states (in red color) brings more types of state transition as follow:

Between CELL-DCH and ECELL-FACH

Between CELL-DCH(CPC) and CELL-FACH

Between CELL-DCH(CPC) and ECELL-FACH




UE state transition in HSPA+

The new state transition uses 4A/4B event report and transitiontimer parameters, these parameters are consistent with the

original state transition parameters, or some new 4A/4B/timers

parameters are added for the specific state transition

The MML commands are:

SET UESTATETRANS

SET UESTATETRANSTIMER




MML commands and parameters

SET CORRMALGOSWITCH

CfgSwitch to configure CFG_HSPA_DTX_DRX_SWITCH ,

CFG_HSPA_HSSCCH_LESS_OP_SWITCH

ADD CELLALGOSWITCH

HspaPlusSwitch to enable DTX_DRX,

HS_SCCH_LESS_OPERATION, L2ENHANCED











Enhanced F-DPCH

In RAN10,

F-DPCH only support 1 time slot format, and only 1 TPC could be

carried in one time slot

(Tx OFF)

NOFF2 bits

Slot #0 Slot #1 Slot #i Slot #14

Tslot = 2560 chips

1 radio frame: Tf = 10 ms

TPC

NTPC bits

(Tx OFF)

NOFF1 bits

Slot

Format #i

Channel Bit

Rate (kbps)

Channel Symbol

Rate (ksps)

SF Bits/ Slot F-DPCH (Bits/Slot)

NTPC

0 3 1.5 256 2 2




Enhanced F-DPCH

RAN11 support 10 time slot formats, R7 introduces more formats to

support more flexible configurations to enhance the code efficiency.

ADD CELLALGOSWITCH: cellid=1, HspaEnhSwitch=E_F_DPCH_ON

Slot

Format #i

Channel

Bit Rate

(kbps)

Channel

Symbol

Rate (ksps)

SF Bits/ Slot NOFF1

Bits/Slot

NTPC

Bits/Slot

NOFF2

Bits/Slot

0 3 1.5 256 20 2 2 16

1 3 1.5 256 20 4 2 14

2 3 1.5 256 20 6 2 12

3 3 1.5 256 20 8 2 10

4 3 1.5 256 20 10 2 8

5 3 1.5 256 20 12 2 6

6 3 1.5 256 20 14 2 4

7 3 1.5 256 20 16 2 2

8 3 1.5 256 20 18 2 0

9 3 1.5 256 20 0 2 18




64QAM

64QAM allows 6 bits of information to communicate in one modulation

symbol interval, in case of high signal to noise ratio environment, datarate could be 1.5 times of 16QAM

In R7, the data rate of HSDPA could be in theory: TB_Size/TTI

=43128/2ms＝21.564Mbps；

Signal constellation for QPSK/16QAM/64QAM




MIMO technology

Transmitter: N parallel streams of data is transmitted by the same frequency,

spreading code at the same time, if the channel response of the transmit

antennas are independent, the streams could be decoded at the receiver

Receiver: each receiving antenna receives all the signal, and differentiates

the N parallel channels and decodes and combines the data

by pre coding, parallel independent channel (orthogonal) could be createdand parallel streams of data could be transmitted, the channel capacity is

increase

data1 data2 data3

High speed

data1

data2

data3

Multiple transmition

data1 data2 data3

data1 data2 data3

data1 data2 data3

data1 data2 data3

Multiple reception

data1 data2 data3

Data recovered




MIMO technology

In RAN11, MIMO is supported

Peak data rate could be:

2×2 MIMO: 14.4Mbps × 2＝ 28.8Mbps。

By link simulation, the performance is not much improved for the UE which is

at the border of the coverage, while the UE near the site could gain a better

performance then 16QAM




MIMO technology

Peak data rate could be:

2×2 MIMO: 14.4Mbps × 2＝ 28.8Mbps。

By link simulation, the performance is not much improved for the UE

which is at the border of the coverage, while the UE near the site

could gain a better performance then 16QAM




MML Commands and Parameters

ADD CELLALGOSWITCH

HspaPlusSwitch to enable MIMO, 64QAM, L2ENHANCED

ACT CELLMIMO

SET CORRMALGOSWITCH

CfgSwitch to configure CFG_HSDPA_64QAM_SWITCH,CFG_HSDPA_MIMO_SWITCH

SET FRC

HSPAPLUSSELECTION to select MIMO/64QAM




Specifications improved

RAN10 RAN11

Max HSPA user number

per cell

64 (64 HSDPA,60 HSUPA) 96 HSDPA, 96 HSUPA

Downlink Peak data rate

of UE

14.4Mbps 21Mbps（64QAM）

28Mbps（MIMO）

Baseband board capability

for H users (E-board)

144 HSDPA+72 HSUPA 144 HSDPA+72 HSUPA



谢谢

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Wcdma Ran11 Hspa+ Features