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TITLE:Presentation of QUALCOMM’s 1X-EV-DV Study
SOURCE:Stein LundbyQUALCOMM Inc.(858) 651-5173slundby@qualcomm.com
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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Forward Link Operation (2)
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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Forward Link Operation (3)
• 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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Reverse Link Structure (2)
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
Signal PointMapping0 +11 –1
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
Signal PointMapping0 +11 –1
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
48 BinarySymbolsper Slot
48 BinarySymbolsper Slot
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Reverse Link Structure (3)
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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