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TITLE:Presentation of QUALCOMM’s 1X-EV-DV Study

SOURCE:Stein LundbyQUALCOMM Inc.(858) [email protected]

ABSTRACT:This contribution describes the results from QUALCOMM’s 1X-EV-DV study.

RECOMMENDATION:For information.

Notice©2000 QUALCOMM Incorporated.The information contained in this contribution is provided for the sole purpose of promoting discussion within the TIA and is not binding on the contributor. The contributor reserves the right to add to, amend or withdraw the statements contained herein.The contributor grants a free, irrevocable license to the Telecommunications Industry Association (TIA) to incorporate text contained in this contribution and any modifications thereof in the creation of a TIA standards publication; to copyright in TIA's name any TIA standards publication even though it may include portions of this contribution; and at TIA's sole discretion to permit others to reproduce in whole or in part the resulting TIA standards publications.The contributor may hold one or more patents or copyrights that cover information contained in this contribution. A license will be made available to applicants under reasonable terms and conditions that are demonstrably free of any unfair discrimination.Nothing contained herein shall be construed as conferring by implication, estoppel, or otherwise any license or right under any patent, whether or not the use of information herein necessarily employs an invention of any existing or later issued patent, or copyright. The contributor reserves the right to use all material submitted in this contribution for their own purposes, including republication and distribution to others.

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Outline

• Introduction

• Overview of Proposal

• Dynamic Resource Allocation

• Forward Link Structure

• DRC Feedback

• Scheduling of PSCH

• Reverse Link Structure

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Introduction (1)

• QUALCOMM supports the goal of enhancing packet data transmission capability in a cdma2000 system with integrated voice and data services– The existing cdma2000 standard supports integrated

voice and data services with data rates up to 643.2 kbps for 1x

– 1xEV-DV systems need to be significantly better than existing cdma2000 systems (with voice and data users) to make the additional development and fielding costs worthwhile

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Introduction (2)

• Our study has targeted the TSG-S Stage 1 requirements for 1xEV-DV– However, some of the requirements seem difficult to

meet with existing technology» Doubling voice capacity

» Required packet data rate and throughput in some environments

– None of the 1xEV-DV proposals presented so far meet all of these fundamental requirements

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Introduction (3)

• This presentation contains results of our study

• Concepts reused from the 1xEV-DO standard:– Fast feedback of forward link condition and fast sector

selection allows for optimal resource allocation

–Multi-user diversity

– Adaptive coding and modulation

– Incremental redundancy

– Explicit rate indication on reverse link

• The critical issue is how to apply these concepts efficiently when voice users are present

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Introduction (4)

• The performance of this proposal is as good as or better than any proposals presented so far

• There is still room for significant improvements– New ideas to be studied

– Lessons to be learned from cdma2000 1x deployment

– Lessons to be learned from 1xEV-DO development and deployment

• It would be beneficial if all companies will study 1xEV-DV more thoroughly– It is impractical to try to define a good 1xEV-DV

standard in six months

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Overview of Proposal

Enhancements to cdma2000:

• Enhanced scheduling of left-over resources

– Dynamic allocation of code space and BTS PA power unused by low-delay constraint services (FCH, SCH, DDCH) or overhead channels (FCCCH, PCH, …)

• Higher peak data rates on RL and FL

• Incremental redundancy

• Explicit rate indication on RL

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Dynamic Resource Allocation

• Pool as much as possible of unused power and Walsh codes in to the Pooled Supplemental Channel (PSCH):

TX

Io

r

Time

Ior max.

Wal

sh

Sp

ace

Time

Used by dedicatedand common CHs

Leftovers pooled into PSCH

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Forward Link Structure (1)

• Channel format of PSCH similar to DO:– Up to 14 parallel sub-channels, each with a different

Walsh code of length 16 chips

– 1 physical layer packet encoded and de-multiplexed over the sub-channels

DEMUX I/Q Pairs 1 to N

Encoded, Interleaved,

Modulated data

I

Q

I

Q

I

Q

I

Q

…

16 Chip Walsh Sub-Channel Cover 1

16 Chip Walsh Sub-Channel Cover 2

16 Chip Walsh Sub-Channel Cover N

I

Q

I

Q

I

Q

…

SummerI

Q

I

QOther channels

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User CSubPktPUser A

SubPktP User B

SubPktP User A SubPktP

Forward Link Structure (2)

• Frame format of PSCH:– Variable length encoding

» Minimum = 1.25 ms = 1 slot

» Lower rates get longer sub-packets

– Data rate specified by preamble

Time

P= Preamble

Slot duration = 1.25 ms

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Incremental Redundancy (ARQ)

• Encoded packet sliced into several sub-packets:

• Each sub-packet sent over 1 or more slots

R=1/5 encoded, interleaved symbols Copy of R=1/5 encoded, int. symbols

1st TXP 2nd TXP 3rd TXP 4th TXP

Minimum1.25 ms

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DRC Feedback

• Feedback Normalized DRC (NDRC) at 800 Hz:

– NDRC is DRC computed assuming that the PSCH will

be offered the same power as the pilot channel

–MS sends NDRC, but BTS selects rate

» Lowers delay from rate determination to transmission

» MS is told rate in preamble

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Forward Link Operation (1)

BTS

Timeline of events

MS

NDRC

PSCH: P+Data

ACK/NACK

Broadcast PSCH space info(0)

(1)

(2,3,4,5)

(6,7)

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Timeline of events:

0) BTS a periodically broadcasts PSCH Walsh space

1) MS sends back NDRC

2) BTS (or BSC) selects MS to transmit on PSCH

3) BTS scales NDRC according to leftover Ior

4) Data encoded and modulated according to scaled NDRC and PSCH space

5) Preamble + data transmitted on PSCH

6) MS detects packet and determines rate

7) MS decodes and sends fast ACK or NACK on RL

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• MS can operate without dedicated channels

– CPCCH carries 800 Hz RL PC bits if FCH and DCCH are

absent

• PSCH uses cell site selection

– Site re-selection occurs at lower rate than slot by slot

– Significantly reduces network load

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Reverse Link Structure (1)

• NDRC feedback channel sent @ 800 Hz

• ACK / NACK channel sent @ 800 Hz

• Additional higher rates

– Up to ~1 Mbit/s

• Explicit Rate Indication

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NDRC Symbols(FL Rate Information)

One 4-Bit Symbolper Active

1.25-ms Slot

EncoderR = 4/ 6

Signal PointMapping0 +11 –1

6 BinarySymbolsper Slot

NDRC Cover Symbols(Sector Information)One 3-Bit Symbol

per Active1.25-ms Slot

ACK Symbols1 Bit per

1.25-ms Slot


Repetition(Factor = 48)

7 BinarySymbols

per Packet

SimplexEncoder

RRI Symbols(RL Rate

Information)One 3-Bit Symbol per

20-ms Packet

CodewordRepetition(Factor =

110)

PunctureLast 2

Symbols

770 BinarySymbols

per Packet


ReverseRate Indicator

Channel(1.2288 Mcps)

768 BinarySymbols

per Packet

3216W

8i

Walsh Cover

, i 1,..., 7W

NDRCChannel

(1.2288 Mcps)F

ACKChannel

(1.2288 Mcps)

H

G

3212W

3228W



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Notes :1. Binary signals are represented with 1 values

with the mapping +1 for ‘0’ and –1 for ‘1’.Unused channels and gated-off symbols arerepresented with zero values.

2. When the Reverse Common Control Channel orEnhanced Access Channel is used, the onlyadditional channel is the Reverse Pilot Channel.

3. All of the pre-baseband-filter operations occurat the chip rate of 1.2288 Mcps.

Complex Multiplier

–

+

+

+

BasebandFilter

BasebandFilter

cos(2fct)

sin(2fct)

Gain

Decimatorby Factor

of 2

Walsh Cover(+ – )

s(t)

1-ChipDelay

Long CodeGenerator

(1.2288 Mcps)

Q-ChannelPN Sequence

I -ChannelPN Sequence

Long CodeMask

I -ChannelData

Q-ChannelData

+

+

Reverse PilotChannel

A

RelativeGain

GACK Channel

RelativeGain

FNDRC Channel

RelativeGain

EReverse

SupplementalChannel 2

RelativeGain

BReverse

DedicatedControl Channel

RelativeGain

HReverse

Rate IndicatorChannel

RelativeGain

CReverse

FundamentalChannel

ReverseSupplemental

Channel 1, ReverseCommon Control

Channel, orEnhanced Access

Channel

RelativeGain

D

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