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Validating LTE-A UEs: The Increasing Importance of Data Throughput Performance

Joaquín Torrecilla

MBO Chief Architect

November 18, 2014

Page Agenda

• LTE-A Carrier Aggregation serving the exploding demands of mobile data

• Data throughput characterization

• A standards view

- PHY/MAC layer throughput

- PDCP layer throughput

- End-to-end throughput

• Summary

• Panel style Q&A

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• Summary

• Panel style Q&A

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UE designers are geared-up for mobile data explosion

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Mobile Data Traffic

2013-2018:

11x Growth!!

Monthly Mobile Data

Traffic in Exabytes

We’re in the era of 4G & Beyond!

LTE-A Carrier Aggregation is here

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LTE-A Evolution in 3GPP

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•Intra-band contiguous TDD/ FDD

•Inter-band non-contiguous FDD

•3CC DL

•2CC UL

•FDD <->TDD CA

•Licensed/ Unlicensed

More bands, More band combinations, More component carriers

•Intra-band non-contiguous FDD/ TDD

Page Agenda







• Summary

• Panel style Q&A

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LTE throughput

– The UE category

– The Cell Bandwidth, variable from 1.4MHz to 20MHz

– How much space is allocated to the PDCCH (CFI setting)

– The number of Resource Blocks (RB’s) or Resource Block Groups (RBG’s)

– The allocation of Sub-Frames (SF’s), full allocation = 10

– The modulation coding scheme (I-MCS)

– Transport Block Size (I-TBS) – defined block data rates

– The number of spatially multiplexed data streams or codewords, SISO or

MIMO, 2*2, 4*2, 4*4 etc

– Whether Carrier Aggregation is employed

– In the real world, the channel conditions, noise, interference, number of

users all contribute

What are the prime factors which determine data rates?

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Real world Conditions affecting LTE/LTE-A device performance Channel and Network factors that impact

mobile device performance

– Link loss

– Fading Conditions

– Doppler Speed

– Degree of Spatial Diversity

– Noise and interference

conditions

– Transmission Mode used

– Influence of re-transmissions

and adaptive modulation and

coding

Interference

Noise

Doppler

Multipath Fading

Adaptive modulation

and coding schemes

Link

loss

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LTE UE categories Data Rates

Category DL peak data rate UL peak data rate

1 10 Mbps 5 Mbps

2 50 Mbps 25 Mbps

3 100 Mbps 50 Mbps

4 150 Mbps 50 Mbps

5 300 Mbps 75 Mbps

6 300 Mbps 50 Mbps

7 300 Mbps 100 Mbps

8 3 Gbps 1.5 Gbps

9 450 Mbps 50 Mbps

10 450 Mbps 100 Mbps

New categories (11, 12, …)

UL Mod

64QAM UL

64QAM UL

64QAM UL

64QAM UL

64QAM UL

64QAM UL

64QAM UL

DL Mod

256QAM DL

256QAM DL

256QAM DL

256QAM DL

256QAM DL

256QAM DL

256QAM DL

Carriers

1CC

1CC

1CC

1CC

1CC

2/1CC

2/2CC

5/5CC

3/1CC

3/2CC

4/4CC+

DL MIMO

SISO

2x2

2x2

2x2

4x4

2x2

2x2

8x8

2x2

2x2

8x4+

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Data Throughput Measurement points

App

IP

PDCP

RLC

MAC

PHY

MAC layer throughput

(padding)

PDCP layer throughput

(user data)

IP layer throughput

(user data)

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Page Agenda







• Summary

• Panel style Q&A

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Data throughput measurement Standards

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L1 and PHY versus Application Layer TPut Comparison of 37.901 with 36.521 Section 7,8,9

36.521 37.901

Channel Model Fading, Noise, OCNG Fading, Noise

Measurement point Up to MAC or PDCP Up to TCP/UDP

Test Specifications Defines PASS/FAIL

limits for each test case

No PASS/FAIL

Allocations FRC (s7, s8)

Follow CQI,PMI,RI (s9)

Follow CQI,PMI,RI

Data type MAC Padding

PDCP data

UDP, FTP (TCP)

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Page Agenda







• Summary

• Panel style Q&A

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PHY/MAC layer throughput Overview

Characterize

PHY/MAC layer

throughput

(36.521-1)

Against path loss

Against interferers

(mod & CW)

Against noise

and fading

CSI adaptation

Chapter 7

Chapter 9

Chapter 7

Chapter 8

MAC padding

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Summary of test cases 36.521-1 Chapter 7

36.521-1 Title

7.3 (A.1, A.2, A.3, B) Reference sensitivity level

7.4 (A.1, A.2, A.3, A.4, B) Maximum input level

7.5 (A.1, A.2, A.3, A.4, B) Adjacent Channel Selectivity (ACS)

7.6.1 (A.1, A.2, A.3, B) In-band blocking

7.6.2 (A.1, A.2, A.3, B) Out of-band blocking

7.6.3 (A.1, A.2, A.3, B) Narrow band blocking

7.7 (A.1, A.2, A.3, B) Spurious response

7.8.1 (A.1, A.2, A.3, B) Wide band Intermodulation

7.9 Spurious emissions

Variations for CA and UL-MIMO

A.1 - intra-band contiguous DL CA and UL CA

A.2 - intra-band contiguous DL CA without UL CA

A.3 - inter-band DL CA without UL CA

A.4 - intra band non-contiguous DL CA without UL CA

B - UL-MIMO

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Reference Sensitivity Level Test 7.3

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Test Parameters for Channel Bandwidths

Downlink Configuration Uplink Configuration

Ch BW Mod'n RB allocation Mod'n RB allocation

FDD TDD FDD TDD

1.4MHz QPSK 6 6 QPSK 6 6

3MHz QPSK 15 15 QPSK 15 15


5MHz QPSK 25 N/A QPSK 20 N/A










20MHz QPSK 100 100 QPSK 100 100





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Reference Sensitivity Level

– Setup with DL and UL allocations as

stated

– Transmit DL at REFSENS level and UL

at PUMAX

– Measure the average throughput for a

duration sufficient to achieve statistical

significance

– The throughput shall be ≥ 95%

of the maximum throughput

of the reference measurement

channels

Test 7.3

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Channel bandwidth

E-UTRA

Band

1.4 MHz

(dBm)

3 MHz

(dBm)

5 MHz

(dBm)

10 MHz

(dBm)

15 MHz

(dBm)

20 MHz

(dBm)

Duplex

Mode

1 - - -99.3 -96.3 -94.5 -93.3 FDD

2 -102.0 -99.0 -97.3 -94.3 -92.5 -91.3 FDD

…

40 - - -99.3 -96.3 -94.5 -93.3 TDD

41 - - -97.3 -94.3 -92.5 -91.3 TDD

…

Reference sensitivity

QPSK PREFSENS

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Summary of test cases 36.521-1 Chapter 8 (1/3)

36.521-1 Title

8.2.1.1.1 (_1, A.1, A.2) FDD PDSCH Single Antenna Port Performance

8.2.1.1.2 FDD PDSCH Single Antenna Port Performance with 1 PRB in presence of MBSFN

8.2.1.2.1 (_1) FDD PDSCH Transmit Diversity 2x2

8.2.1.2.2 (_1) FDD PDSCH Transmit Diversity 4x2

8.2.1.2.4 FDD PDSCH Transmit Diversity 2x2 with TM3 Interference Model – Enhanced

Performance Requirement Type A

8.2.1.3.1 (_1, A.1, A.2) FDD PDSCH Open Loop Spatial Multiplexing 2x2

8.2.1.3.2 (C.1, C.2) FDD PDSCH Open Loop Spatial Multiplexing 4x2

8.2.1.4.1 (_1) FDD PDSCH Closed Loop Single/Multi Layer Spatial Multiplexing 2x2

8.2.1.4.2 (_1, A.1, A.2) FDD PDSCH Closed Loop Single/Multi Layer Spatial Multiplexing 4x2

8.2.2.1.1 (_1, A.1) TDD PDSCH Single Antenna Port Performance

8.2.2.1.2 TDD PDSCH Single Antenna Port Performance with 1PRB in the presence of MBSFN

8.2.2.2.1 (_1) TDD PDSCH Transmit Diversity 2x2

8.2.2.2.2 (_1) TDD PDSCH Transmit Diversity 4x2

8.2.2.3.1 (_1, A.1) TDD PDSCH Open Loop Spatial Multiplexing 2x2

8.2.2.3.2 (C.1, C.2) TDD PDSCH Open Loop Spatial Multiplexing 4x2

8.2.2.4.1 (_1) TDD PDSCH Closed Loop Single/Multi Layer Spatial Multiplexing 2x2

8.2.2.4.2 (_1) TDD PDSCH Closed Loop Single/Multi Layer Spatial Multiplexing 4x2

Variations

_1 – Rel.9 and forward

A.1 – intra-band contiguous DL CA

A.2 – inter-band DL CA

C.1 – eICIC (non-MBSFN ABS)

C.2 - eICIC (MBSFN ABS)

D – eDL-MIMO

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36.521-1 Title

8.3.1.1.1_D FDD PDSCH Single-layer Spatial Multiplexing on antenna ports 7 or 8 without a

simultaneous transmission for eDL-MIMO

8.3.1.1.2_D FDD PDSCH Single-layer Spatial Multiplexing on antenna ports 7 or 8 with a

simultaneous transmission for eDL-MIMO

8.3.1.1.3 FDD PDSCH Single-layer Spatial Multiplexing on antenna ports 7 or 8 with TM9

Interference Model - Enhanced Performance Requirement Type A

8.3.1.2.1_D FDD PDSCH Dual-layer Spatial Multiplexing for eDL-MIMO

8.3.2.1.1 (_1) TDD PDSCH Single-layer Spatial Multiplexing on antenna port 5 (Release 8 and forward)

8.3.2.1.2 (_D) TDD PDSCH Single-layer Spatial Multiplexing on antenna port 7 or 8 without a

simultaneous transmission

8.3.2.1.3 (_D) TDD PDSCH Single-layer Spatial Multiplexing on antenna port 7 or 8 with a simultaneous

transmission

8.3.2.1.4 TDD PDSCH Single-layer Spatial Multiplexing on antenna ports 7 or 8 with TM9

Interference Model - Enhanced Performance Requirement Type A

8.3.2.2.1 (_D) TDD PDSCH Dual-layer Spatial Multiplexing

Variations






D – eDL-MIMO

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36.521-1 Title

8.4.1.1 FDD PCFICH/PDCCH Single-antenna Port Performance

8.4.1.2.1 (_1) FDD PCFICH/PDCCH Transmit Diversity 2x2

8.4.1.2.2 (_1) FDD PCFICH/PDCCH Transmit Diversity 4x2

8.4.2.1 TDD PCFICH/PDCCH Single-antenna Port Performance

8.4.2.2.1 (_1) TDD PCFICH/PDCCH Transmit Diversity 2x2

8.4.2.2.2 (_1) TDD PCFICH/PDCCH Transmit Diversity 4x2

8.5.1.1 FDD PHICH Single-antenna Port Performance

8.5.1.2.1 (_1) FDD PHICH Transmit Diversity 2x2

8.5.1.2.2 (_1) FDD PHICH Transmit Diversity 4x2

8.5.2.1 TDD PHICH Single-antenna Port Performance

8.5.2.2.1 (_1) TDD PHICH Transmit Diversity 2x2

8.5.2.2.2 (_1) TDD PHICH Transmit Diversity 4x2

8.5.2.2.3_C.1 TDD PHICH Transmit Diversity 2x2 for eICIC (non-MBSFN ABS)

Variations






D – eDL-MIMO

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FDD PDSCH Closed Loop Single/Multi Layer Spatial Multiplexing 4x2 Test 8.2.1.4.2

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Parameter Unit Test 1 Test 2

Downlink power allocation

ρA dB -6 -6

ρB dB -6 (Note 1) -6 (Note 1)

dB 3 3

NOC at antenna port dBm/15kHz -98 -98

Precoding granularity PRB 6 6

PMI delay (Note 2) ms 8 8

Reporting interval ms 1 1

Reporting mode PUSCH 1-2 PUSCH 1-2

CodeBookSubsetRestriction bitmap 000000000000000000000000

000000000000000000000000

1111111111111111

000000000000000000000000

000000001111111111111111

0000000000000000

PDSCH transmission mode 4 4

Note 1: ρB = 1

Note 2: If the UE reports in an available uplink reporting instance at subframe SF#n based on PMI estimation at a downlink SF not later than

SF#(n-4), this reported PMI cannot be applied at the eNB downlink before SF#(n+4)

Figure A.11: Connection for RX

performance tests with antenna

configuration 4x2 (transmit diversity)

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FDD PDSCH Closed Loop Single/Multi Layer Spatial Multiplexing 4x2

– Setup with conditions stated

– Configure faders and noise

generators (OCNG, EVA5, 4x2

Low Correlation)

– Throughput must be >70% for

SNR stated in the test

requirements

(-2.3 dB, 11.4 dB)

– Repeat for test 2

Test 8.2.1.4.2

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Test

number

Band-

width

Reference

Channel

OCNG

Pattern

Propagation

Condition

Correlation

Matrix and

Antenna

Configuration

Reference value UE

Category Fraction of

Maximum

Throughput (%)

SNR

(dB)

1 10 MHz R.13 FDD OP.1 FDD EVA5 4x2 Low 70 -2.3 1-5

2 10 MHz R.14 FDD OP.1 FDD EVA5 4x2 Low 70 11.4 2-5

Test requirements

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36.521-1 Title

9.2.1.1 FDD CQI Reporting under AWGN conditions - PUCCH 1-0

9.2.1.2 TDD CQI Reporting under AWGN conditions - PUCCH 1-0

9.2.1.4_C.1 TDD CQI Reporting under AWGN conditions - PUCCH 1-0 for eICIC (non-MBSFN ABS)

9.2.2.1 FDD CQI Reporting under AWGN conditions - PUCCH 1-1

9.2.2.2 TDD CQI Reporting under AWGN conditions - PUCCH 1-1

9.2.3.1_D FDD CQI Reporting under AWGN conditions - PUCCH 1-1 for eDL-MIMO

9.2.3.2_D TDD CQI Reporting under AWGN conditions - PUCCH 1-1 for eDL-MIMO

9.3.1.1.1 FDD CQI Reporting under fading conditions - PUSCH 3-0

9.3.1.1.2 TDD CQI Reporting under fading conditions - PUSCH 3-0

9.3.1.2.1_D FDD CQI Reporting under fading conditions - PUSCH 3-1 for eDL-MIMO

9.3.1.2.2_D TDD CQI Reporting under fading conditions - PUSCH 3-1 for eDL-MIMO

9.3.2.1.1 (+Rel.9 & forward) FDD CQI Reporting under fading conditions - PUCCH 1-0

9.3.2.1.2 (+Rel.9 & forward) TDD CQI Reporting under fading conditions - PUCCH 1-0

9.3.2.2.1_D FDD CQI Reporting under fading conditions - PUCCH 1-1 for eDL-MIMO

9.3.2.2.2_D TDD CQI Reporting under fading conditions - PUCCH 1-1 for eDL-MIMO

9.3.3.1.1 FDD CQI Reporting under fading conditions and frequency-selective interference -

PUSCH 3-0

9.3.3.1.2 TDD CQI Reporting under fading conditions and frequency-selective interference -

PUSCH 3-0

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36.521-1 Title

9.3.4.1.1 FDD CQI Reporting under fading conditions - PUSCH 2-0

9.3.4.1.2 TDD CQI Reporting under fading conditions - PUSCH 2-0

9.3.4.2.1 FDD CQI Reporting under fading conditions - PUCCH 2-0

9.3.4.2.2 TDD CQI Reporting under fading conditions - PUCCH 2-0

9.3.5.1.1 FDD CQI Reporting under fading conditions - PUCCH 1-0 - Enhanced Performance

Requirement Type A

9.3.5.2.1 FDD CQI Reporting under fading conditions - PUCCH 1-1 - Enhanced Performance

Requirement Type A

9.3.5.2.2 TDD CQI Reporting under fading conditions - PUCCH 1-1 - Enhanced Performance

Requirement Type A

9.4.1.1.1 FDD PMI Reporting - PUSCH 3-1 (Single PMI)

9.4.1.1.2 TDD PMI Reporting - PUSCH 3-1 (Single PMI)

9.4.1.2.1 FDD PMI Reporting - PUCCH 2-1 (Single PMI)

9.4.1.2.2 TDD PMI Reporting - PUCCH 2-1 (Single PMI)

9.4.1.3.1_D FDD PMI Reporting - PUSCH 3-1 (Single PMI) for eDL-MIMO

9.4.1.3.2_D TDD PMI Reporting - PUSCH 3-1 (Single PMI) for eDL-MIMO

9.4.2.1.1 (+Rel.9 & forward) FDD PMI Reporting - PUSCH 1-2 (Multiple PMI)

9.4.2.1.2 (+Rel.9 & forward) TDD PMI Reporting - PUSCH 1-2 (Multiple PMI)

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36.521-1 Title

9.4.2.2.1 FDD PMI Reporting - PUSCH 2-2 (Multiple PMI)

9.4.2.2.2 TDD PMI Reporting - PUSCH 2-2 (Multiple PMI)

9.4.2.3.1_D FDD PMI Reporting - PUSCH 1-2 (Multiple PMI) for eDL-MIMO

9.4.2.3.2_D TDD PMI Reporting - PUSCH 1-2 (Multiple PMI) for eDL-MIMO

9.5.1.1 (+Rel.10, +Rel.11) FDD RI Reporting - PUCCH 1-1

9.5.1.2 (+Rel.10, +Rel.11) TDD RI Reporting - PUSCH 3-1

9.5.2.1_D FDD RI Reporting - PUCCH 1-1 for eDL-MIMO

9.5.2.2_D TDD RI Reporting - PUCCH 1-1 for eDL-MIMO

9.5.3.1_C.1 FDD RI Reporting – PUCCH 1-0 for eICIC (non-MBSFN ABS)

9.5.3.2_C.1 TDD RI Reporting – PUCCH 1-0 for eICIC (non-MBSFN ABS)

9.6.1.1_A.2 FDD CQI Reporting under AWGN conditions – PUCCH 1-0 for CA (inter band DL CA)

9.6.1.2_A.1 TDD CQI Reporting under AWGN conditions – PUCCH 1-0 for CA (intra band contiguous

DL CA)

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521-1 Chapter 9 Test Cases CQI Reporting Modes

No PMI Single

PMI

Multiple

PMI

Wideband CQI 1-2

Subband CQI – UE

selected 2-0 2-2

Subband CQI - Higher

layer configured 3-0 3-1

No PMI Single

PMI

Wideband CQI 1-0 1-1

Subband CQI –

UE selected 2-0 2-1

PUSCH CQI reporting PUCCH CQI reporting

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FDD CQI Reporting under AWGN conditions - PUCCH 1-0 Test 9.2.1.1

Parameter Unit Test 1 Test 2

Bandwidth MHz 10

PDSCH transmission mode 1

Downlink power

allocation

dB 0

dB 0

Propagation condition and antenna

configuration AWGN (1 x 2)

SNR (Note 2) dB 0 1 6 7

dB[mW/15kHz] -98 -97 -92 -91

dB[mW/15kHz] -98 -98

Max number of HARQ transmissions 1

Physical channel for CQI reporting PUCCH Format 2

PUCCH Report Type 4

Reporting periodicity ms NP = 5

cqi-pmi-ConfigurationIndex 6

Note 1: Reference measurement channel according to Table A.4-1 with one sided dynamic OCNG Pattern OP.1 FDD as

described in Annex A.5.1.1.

Note 2: For each test, the minimum requirements shall be fulfilled for at least one of the two SNR(s) and the respective

wanted signal input level.

A

B

)(ˆ j

orI)( j

ocN

PUCCH 1-0 static test (36.101 [10] Table 9.2.1-1)

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FDD CQI Reporting under AWGN conditions - PUCCH 1-0

– Setup with conditions stated and measure

the median value of CQI

– 90% of all 2000 CQI results obtained must

be within +/- 1 of this median value

– Take this median CQI-1 value and measure

BLER which must be less than 10%.

– Take the median CQI +1 value and measure

the BLER which must be greater than 10%.

– If the UE fails this test using the first SNR

value (0 dB), then the test sequence can be

repeated using the second value (1 dB). The

UE must pass at least one of these two

tests. The test is then repeated for the SNR

of 6dB, and if necessary 7dB.

Test 9.2.1.1

Med CQI Med CQI+1 Med CQI-1

Test part 2 with

lower than optimal

data flow results in

low BLER (less than

10%)

Test part 3 with

higher than optimal

data flow results in

high BLER (greater

than 10%)

Establish Median CQI

in test part 1

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Configuration of PMI/RI allocations

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PMI (9.4.x) & RI (9.5.x) tests

Static, Adaptive

and Random

PMI/RI allocations Sub-frame by sub-

frame allocations

based on UE CQI

report values

Page Agenda







• Summary

• Panel style Q&A

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Summary of test cases 36.521-1 Chapter 8.7

36.521-1 Title

8.7.1.1 FDD sustained data rate performance

8.7.1.1_1 FDD sustained data rate performance (Rel-10 and forward)

8.7.1.1_A.1 FDD Sustained data rate performance for CA (intra-band contiguous DL CA)

8.7.1.1_A.2 FDD Sustained data rate performance for CA (inter-band DL CA)

8.7.2.1 TDD sustained data rate performance

8.7.2.1_1 TDD sustained data rate performance (Rel-10 and forward)

8.7.2.1_A.1 TDD sustained data rate performance for CA (intra-band contiguous DL CA)

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FDD sustained data rate performance Test 8.7.1.1

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UE

Category

Applicable

test

DL

Measurement

channel

UL

Measurement

channel

TBsize per

Codeword

Number of

PDCP SDU per

Codeword

Reference value

TB success rate [%]

1 Test 1 R31-1 FDD R.1-1 FDD 10296 1 95

2 Test 2 R31-2 FDD R.1-2 FDD 25456 3 95

3 Test 3 R31-3 FDD R.1-3 FDD 51024 5 95

3 Test 3A R31-3A FDD R.1-3A FDD 36696 4 85

4 Test 4 R31-4 FDD R.1-4 FDD 75376 7 85

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FDD sustained data rate performance

– The purpose of the test is to verify that the Layer 1 and Layer 2

correctly process in a sustained manner the received packets

corresponding to the maximum number of DL-SCH transport block

bits received within a TTI for the UE category indicated. The

sustained downlink data rate shall be verified in terms of the

success rate of delivered PDCP SDU(s) by Layer 2

– Using cyphered PDCP PDUs

– The TB success rate should be ≥ 95% (Tests 1, 2, 3) or ≥ 85%

(Tests 3A, 4) AND the PDCP SDU loss should equals 0

Test 8.7.1.1

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Page Agenda







• Summary

• Panel style Q&A

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LTE Application layer data throughput performance

Test Procedures

for Application-layer

UE data throughput

performance

under simulated

realistic network

scheduling

and radio conditions

3GPP TR 37.901: Meeting UE data demands without network overload

Test Sets need integrated capabilities:

- Full/ maximum IP Data measurements

- Tethered PC

- Integrated fading/noise

- RF/ Layer 1

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901 Summary

– No pass/fail verdicts, no test limits

– Tests for FTP/TCP and UDP

– Various fading and noise levels to force re-transmissions, rank

transitions etc

– 37.901 will NOT test fully throughput – no max data rates

– No Carrier Aggregation tests – Yet!!

– 37.901 testing is MUCH simpler with integrated fading, noise and

FTP server

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901

– UDP because it can be tested bi-directional without the other

direction interfering, and can be used to characterize RTP

• Downlink only, uplink only, bi-directional (concurrent)

– TCP/IP using FTP, because it effectively tests all forms of TCP/IP

underlying protocol such as SFTP and HTTP

• Downlink only, uplink only, bi-directional (concurrent and

alternating)

– SFTP, HTTP use TCP/IP so are not considered separately

– VoIP (RTP-based) has a wide variety of possible test setup’s, but in

testing UDP alone, the underlying RTP (although NOT GBR

aspects) is tested

key points v11.11.0 (2014-06)

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901 Test Cases LTE UDP Downlink

37.901 Title

A.3.3.1 LTE / UDP DL / PDSCH Single Antenna Port Performance (CSRS)

A.3.3.2 LTE / UDP DL / PDSCH Transmit Diversity Performance (CSRS)

A.3.3.3 LTE / UDP DL / PDSCH Open Loop Spatial Multiplexing Performance (CSRS)

A.3.3.4 LTE / UDP DL / PDSCH Closed Loop Spatial Multiplexing Performance (CSRS)

A.3.3.5 LTE / UDP DL / PDSCH Single-layer Spatial Multiplexing Performance (Port 5, UE-Specific RS)

A.3.3.6 LTE / UDP DL / PDSCH Single-layer Spatial Multiplexing Performance (Port 7 or 8, UE-Specific RS)

A.3.3.7 LTE / UDP DL / PDSCH Dual-layer Spatial Multiplexing Performance (port 7 and 8, User-Specific RS)

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901 Test Cases LTE FTP Downlink

37.901 Title

A.3.2.1 LTE / FTP DL / PDSCH Single Antenna Port Performance (CSRS)

A.3.2.2 LTE / FTP DL / PDSCH Transmit Diversity Performance (CSRS)

A.3.2.3 LTE / FTP DL / PDSCH Open Loop Spatial Multiplexing Performance (CSRS)

A.3.2.4 LTE / FTP DL / PDSCH Closed Loop Spatial Multiplexing Performance (CSRS)

A.3.2.5 LTE / FTP DL / PDSCH Single-layer Spatial Multiplexing Performance (Port 5, UE-Specific RS)

A.3.2.6 LTE / FTP DL / PDSCH Single-layer Spatial Multiplexing Performance (Port 7 or 8, UE-Specific RS)

A.3.2.7 LTE / FTP DL / PDSCH Dual-layer Spatial Multiplexing Performance (port 7 and 8, User-Specific RS)

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A.3.2.4 FTP DL Closed Loop MIMO Parameter Unit All Tests

Downlink power

allocation

dB -3

dB -3 (Note 1)

at antenna port dBm/15kHz -85 (Note 2)

at antenna port dBm/15kHz -98

Transmission mode 4

Reporting periodicity ms Npd = 5

cqi-pmi-ConfigurationIndex 4

ri-ConfigurationInd 1 (Note 4)

CQI delay ms 8 for FDD

10 for TDD (Note 3)

Reporting mode PUCCH 1-1

CodeBookSubsetRestriction bitmap 111111

Note 1:

Note 2: is applied to only Test Number 1 in Table A.3.2.4.3-2: Test points for Closed Loop

SpatialMultiplexing Downlink Testing

Note 3: If the UE reports in an available uplink reporting instance at subframe SF#n based on PMI

and CQI estimation at a downlink subframe not later than SF#(n-4), this reported PMI and

wideband CQI cannot be applied at the eNB downlink before SF#(n+4).

Note 4: To avoid the ambiguity of SS behaviour when applying CQI and PMI during rank

switching, RI reports are to be applied at the SS with one subframe delay in addition to

Note 3 to align with CQI and PMI reports.

A

B

ocN

1BP

sE

Table A.3.2.4.3-1: Test Parameters for Closed Loop

Spatial Multiplexing Downlink Testing

sE

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A.3.2.4 FTP DL Closed Loop MIMO

Initial conditions

Channel bandwidth Note1

Test parameters for each bandwidth

Test

Number

Reference test

point

Note 2

Propagation Conditions

Note 2

SNR (dB)

Note 2

Correlation

1 LTE-1 Static No

interference

Note 3

N/A

2 LTE-2 EPA5 20 Low

3 LTE-3 EVA5 10 Low

4 LTE-4 ETU70 0 Low

5 LTE-5 ETU300 0 Low

Note 1: See Annex B.3 for the recommended channel bandwidth

Note 2: The test points is according to Table B.1.2-1in Annex B.1.2.

Note 3: In the performance report, the tester shall indicate for the ‘No Interference’ condition,

the following note: In case of 'no interference', the throughput is expected to be

maximal. This may be the maximum theoretical throughput or below. In the latter

case it cannot be distinguished, whether UE limitations, or signal generator

limitations with respect to EVM, or both contribute to this.

Table A.3.2.4.3-2: Test points for Closed Loop Spatial

Multiplexing Downlink Testing

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A.3.2.4 FTP DL Closed Loop MIMO

• Setup the SS/OBT to respond to the UE’s reported CQI, RI and PMI

• Setup the SS/OBT for the correct BW, RMC, Fading, Noise etc

• Using the UDP client, begin UDP download for the test duration (60 seconds for static,

36.521 Annex G3.5 for Faded tests – 14 to 1500 seconds), see 37.901 Table A.3.1-1.

The faded test times vary depending on: Fading profile, Antenna configuration,

Correlation, RMC used etc.

• Note: HSPA tests use 60 seconds for static and 164s for all faded tests

• Record Throughput T result for this first iteration

• Repeat for a further 2-5 iterations

• Calculate and record the Average of the 5 iterations

• Count and record the overall number of ACK and NACK/DTX on the PUSCH/PUCCH

during the test interval.

• Repeat steps above for each subtest in Table A.3.2.4.3-2 on the previous page

• There are no pass/fail limits

Test process

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Actual 37.901 results with UXM – A.3.2.4

© Keysight


Step 1 Static No Noise, Throughput/BLER 10MHz

Generally flat at MAC, with

little TCP variations

No MAC re-transmissions to

give MAX Tput of 50.73Mbps

Page


© Keysight


Step 1 Static No Noise, CSI 10MHz

Rank 2, CQI 15, perfect

channel, no noise, maximum

throughput

No MAC re-transmissions

Page


© Keysight


Step 2 EPA5 20dB SNR, Throughput/BLER 10MHz

Highly variable

throughput and BLER,

The only test step in

A.3.2.4 which really

needs averaging

Page


© Keysight


Step 3 EVA5 10dB SNR, Throughput/BLER 10MHz

Narrower variation

range due to more

noise, using all 4

transmissions

Page


© Keysight


Step 3 EVA5 10dB SNR, CSI 10MHz

Oscillation between rank 1and 2,

two distinct groups of CQI

(10-13 Rank 1, 5-13 Rank 2)

Page


© Keysight


Step 4 ETU70 0dB SNR, Throughput/BLER 10MHz

Tighter grouping for

BLER and CSI due to

high noise and no

Rank Transitions

Page


© Keysight


Step 4 ETU70 0dB SNR, CSI 10MHz

Tighter grouping for

BLER and CSI due to

high noise and almost

no Rank Transitions

901 Test Cases LTE UL, Stress, Power Sweep

37.901 Title

A.3.4 LTE / FTP UL / PDSCH Single Antenna Port Performance (CSRS)

A.3.5 LTE / UDP UL / PDSCH Transmit Diversity Performance (CSRS)

A.3.6.1 LTE / Stress Test Performance / PDSCH Transmit Diversity Performance (CSRS)

A.3.6.2 LTE / Stress Test Performance / PDSCH Open Loop Spatial Multiplexing Performance (CSRS)

A.3.7.1 LTE / UDP Power Sweep Performance / PDSCH Transmit Diversity Performance (CSRS)

A.3.7.2 LTE / UDP Power Sweep Performance / PDSCH Open Loop Spatial Multiplexing Performance (CSRS)

• The UL tests are very simple static channel

• Stress Tests are two single stage tests with either bi-directional UDP or

alternating direction FTP

• Power Sweep tests utilize a number of tests (N) with varying Ior values. In the

A.3.7.2 case, the Ior value decrements down in 2dB steps from -78dB to

REFSENS +6dB, all using EVA70. Ior Compensation is made for the Cell BW

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A.3.7.2 UDP Open Loop Power Sweep Test Conditions

Parameter Unit All Tests

Downlink

power

allocation

dB -3

dB -3 (Note 1)

Transmission mode 3

Reporting interval ms 5

CQI delay ms 8

Reporting mode PUCCH 1-0

Note 1:

A

B

1BP

Table A.3.7.2.3-1: Test Parameters for Open Loop Spatial Multiplexing UDP Power Sweep Testing

Channel bandwidth

BWChannel [MHz] 1.4 3 5 10 15 20

Ior power level offset

(dB) -9.2 -5.2 -3.0 0.0 1.8 3.0

Table A.3.7.2.3-3: Ior Power level offsets for Open Loop Spatial Multiplexing UDP Power Sweep Testing

53

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A.3.7.2 UDP Open Loop Power Sweep Test Conditions

Initial conditions

Channel bandwidth Note1

Test parameters for each bandwidth

Test

Number

Propagation

Conditions

Ior (dBm) Correlation

1 EVA70 -60 Low

2 EVA70 -62 Low

3 EVA70 -64 Low

4 EVA70 -66 Low

5 EVA70 -68 Low

6 EVA70 -70 Low

7 EVA70 -72 Low

8 EVA70 -74 Low

9 EVA70 -76 Low

10 EVA70 -78 Low

11 EVA70 -80 Low

12 EVA70 -82 Low

Table A.3.7.2.3-2: Test Points for Open Loop

Spatial Multiplexing UDP Power Sweep Testing

Note 1: See Annex B.3 for the recommended

channel bandwidth

Note 2: Determine if throughput increases as

the signal level is increased in relation

to the UE noise floor and remains

consistent across Ior values within a

reasonable tolerance once the

throughput has reached a maximum.

Note 3: Ior (dBm) power levels are specified for

10 MHz channel bandwidth. For other

channel bandwidths, add the offset

defined in Table A.3.7.2.3-3.

Note 4: In the performance report, the tester

shall indicate that the throughput is

expected to reach a maximum. This

may be the maximum theoretical

throughput or below. In the latter case it

cannot be distinguished, whether UE

limitations, or signal generator

limitations with respect to EVM, or both

contribute to this.

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A.3.7.2 UDP Open Loop Power Sweep Test Process

• Setup the SS/OBT to respond to the UE’s reported CQI, RI and PMI

• Setup the SS/OBT for the correct BW, RMC, Fading profile etc

• Using the UDP client, begin UDP download for the test duration (60 seconds for static,

36.521 Annex G3.5 for Faded tests), see 37.901 Table A.3.1-1. The faded test times vary

depending on:

• Fading profile

• Antenna configuration

• Correlation

• RMC used etc

• Record Throughput T result.

• Count and record the overall number of ACK and NACK/DTX on the PUSCH/PUCCH during

the test interval.

• Repeat steps above for each subtest in Table A.3.7.2.3-2 on the previous page

• Determine if throughput increases as the signal level is increased in relation to the UE noise

floor and remains consistent across Ior values within a reasonable tolerance once the

throughput has reached a maximum.

• There are no pass/fail limits

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901 Test Cases LTE DL versus SNR

37.901 Title

A.3.8.1 LTE / UDP DL vs SNR PDSCH Transmit Diversity Performance (CSRS))

A.3.8.2 LTE / UDP DL vs SNR PDSCH Open Loop Spatial Multiplexing Performance (CSRS)

A.3.8.3 LTE / UDP DL vs SNR PDSCH Closed Loop Spatial Multiplexing Performance (CSRS)

A.3.8.4 LTE / UDP DL vs SNR PDSCH Single Layer Closed Loop Spatial Multiplexing Performance (CSRS)

• Each of the 4 tests above consists of either 18 or 21 separate test steps

• The test steps are in three groups using Static Channel, EPA5 or EVA70.

• Each group has several levels of Ior and SNR

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Summary

– Different types of testing

• Measurement points (MAC/PHY, PDCP, TCP/UDP)

• Channel (max/min levels, AWGN, fading)

• With/without link adaptation (CSI reporting)

• MIMO schemes (SISO, MIMO 2x2, MIMO 4x2)

– Complex setup, can greatly benefit

from an integrated solution

– Tests will evolve to cover higher

throughput scenarios (carrier

aggregation, higher order modulation

in both DL and UL, higher MIMO

schemes, etc.)

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Technologies 2014

PCell

Channel

emulator

AWGN

+

+

SCell

Channel

emulator

AWGN

+

+

+

+ UE

Page

UXM Wireless Test Set

59

Assess design readiness with greater confidence

LTE-Advanced cat 7 (300 Mbps DL/100 Mbps UL)

– Gain new insights for LTE-Advanced

• Two independent 100 MHz transceivers enable

multiple cells, 4x2 MIMO and carrier aggregation

• Sustained bi-directional E2E data throughput

• Integrated fading and built-in servers

• Emulation of complex network scenarios for

extensive functional performance test

• Proven Keysight X-Series measurement science

for RF performance test

– Be ready for 4G and beyond

• High-speed interconnects, upgradable

processors, multiple expansion slots

• Modern, flexible touch screen display

– Make a seamless transition

• New-yet-familiar user interface

© Keysight

Technologies 2014

Page

Q&A

© Keysight


Contacts:

Webcast presenter, Joaquin Torrecilla:

[email protected]

Webcast contributor, Sandy Fraser:

[email protected]

Moderator and Americas contact, Dave Allen:

[email protected]

Europe contact, Felix Alonso:

[email protected]

mailto:[email protected]




Page

Resources

© Keysight


LTE-Advanced application notes

and videos:

www.keysight.com/find/LTE-A-Insight

E7515A UXM Wireless Test Set:

www.keysight.com/find/E7515A

Seminars and Webcasts:

www.keysight.com/find/events

Learn about additional LTE resources, including the book “LTE and the

Evolution to 4G Wireless”:

www.keysight.com/find/LTE-Advanced

http://www.keysight.com/find/LTE-A-Insight





http://www.keysight.com/find/E7515A

http://www.keysight.com/find/events

http://www.keysight.com/find/LTE-Advanced



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