of 36/36
3GPP U-ETRA/LTE Technology Rohde-schwarz Korea Seung-geun Yoo [email protected]-schwarz.com [email protected]-schwarz.com

Rohde-schwarz Korea Seung-geun Yoo [email protected]

  • View
    1

  • Download
    0

Embed Size (px)

Text of Rohde-schwarz Korea Seung-geun Yoo [email protected]

(Microsoft PowerPoint - Rohde_Scharz_LTE_A.ppt [\310\243\310\257 \270\360\265\345])2003/2004 2005/2006 2007/2008 2011/2012
LTE (2x2), Rel. 8, 20 MHz DL: 173 Mbps UL: 58 Mbps
LTE (4x4), 20 MHz DL: 326 Mbps UL: 86 Mbps
HSPA+, Rel. 8 DL: 42.0 Mbps UL: 11.5 Mbps
OFDMA +
MIMO
cdma
2000
1xEV-DO, Rev. A
1xEV-DO, Rev. B
1xEV-DO, Rev. D
(= UMB 4x4) 20 MHz DL: 280 Mbps UL: 68 Mbps
Mobile WiMAX
Mobile WiMAX, 802.16e
10 MHz DL: 64 Mbps (2x2) UL: 28 Mbps (1x2)
Mobile WiMAX, 802.16m
20 MHz DL: >130 Mbps (4x4) UL: 56 Mbps (2x4)
IEEE 802.11a/b/g IEEE 802.11n
(= UMB 2x2) 20 MHz DL: 140 Mbps UL: 34 Mbps
MIMO
Channel bandwidth 1 Resource Block (RB) =180 kHz
1.4 MHz 3 MHz 5 MHz 10 MHz 15 MHz 20 MHz
6 RB 15 RB 25 RB 50 RB 75 RB 100 RB
Modulation Schemes
Multiple Access Downlink OFDMA (Orthogonal Frequency Division Multiple Access)
Uplink SC-FDMA (Single Carrier Frequency Division Multiple Access)
2011.04.21 | Title of presentation | 3
Uplink SC-FDMA (Single Carrier Frequency Division Multiple Access)
MIMO technology Downlink
Wide choice of MIMO configuration options for transmit diversity, spatial multiplexing, and cyclic delay diversity (max. 4 antennas at base station and handset)
Uplink Multi-user collaborative MIMO
Peak Data Rate Downlink
150 Mbps (UE category 4, 2x2 MIMO, 20 MHz) 300 Mbps (UE category 5, 4x4 MIMO, 20 MHz)
Uplink 75 Mbps (20 MHz)
OFDM vs OFDMA
time domain,
and frequency domain,
Time domain Time domain
frequency
time
QPSK, 16QAM or 64QAM modulationQPSK, 16QAM or 64QAM modulation
UE1UE1
UE4UE4
UE3UE3UE2UE2
DC carrier (downlink only)Active Resource Blocks

#0
1 Radio Frame, TFrame = 307200xTSample 1) = 10 ms
#0 #1 #2 #3 #4 #5 #6 Usage of normal cyclic prefix is assumed
2011.04.21 | Title of presentation | 7
TSYMBOL ≈ 66.7 µs
1) Sampling Rate = 30.72 MHz TSample = 1/(15000x2048) = 32.522 ns
Resource Allocation
l RE( Resource Element), 1symbol / 1 subcarrier
l RB(Resource Block), l 1 RB=12 sub-carriers
12*15 kHz = 180 kHz @ Freq Domain
1 Time Slot (= 0.5 ms) @ time domain,
10 MHz (50RB) 50 RB*180 kHz = 9.0 MHz + 1 unused DC subcarrier (= fCarrier) = 9.015 MHz
2011.04.21 | Title of presentation | 8
Reference signals (DL)
l reference signal pattern
l 2 antennas – Frequency domain = 6 subcarrier
– Time domain = 4 OFDM symbols 4 RS / RB
Resource Block
Resource Block
Carrier
LTE Release 8
LTE Release 8
MIMO OFDMA / SC-FDMA
64QAM
-K55/-K255
-K84/-K284
-K85/-K285
DL feature
l Clustered PUSCH released
l Aperiodic SRS Q2/2012
l Carrier Aggregation Q2/2012
DL feature
l Cross-carrier scheduling for carrier aggregation released
l eICIC: general ABS support released
l DL 4x4 MIMO: generation of 4 TX-antennas released
(including FEC chain, layer mapping and precoding)
l Tx mode 9 Q2/2012
l CSI-RS Q2/2012
LTE Release 10 – eSC-FDMA What is it?
l eSC-FDMA = enhanced Single Carrier FDMA
l The uplink transmission
physical uplink shared
physical uplink shared
channel (PUSCH) uses
l Non - contiguous data transmission
LTE Release 10 – eSC-FDMA Impact on PHY layer
l Simultaneous transmission of PUSCH and PUCCH or a clustered PUSCH qualitatively causes multiple carriers in the frequency spectrum
l This leads to:
Rel-10
l Higher crest factor of the LTE-Advanced signal
l Intermodulation products which might violate frequency masks
l Higher complexity of the base station receiver
LTE Release 10 – eSC-FDMA LTE settings in R&S®SMU200A
clustered PUSCH
clustered PUSCH
simultaneous PUCCH
l LTE release 8
2011.04.21 | Title of presentation | 17
l PUSCH and PUCCH are not present at the same time
LTE Release 10 – eSC-FDMA Application example – intermodulation test
l LTE release 10
l Intermodulation occurs!
l Two or more component carrier are aggregated in order to support wider
transmission bandwidths up to 100MHz (=5 carriers with 20 MHz).
LTE Release 10 – Carrier Aggregation What is it?
Rel-10
2011.04.21 | Title of presentation | 19
l Currently, due to non-availability of free frequency bands, most operators
are not able to implement more than 2 component carriers.
LTE Release 10 – Carrier Aggregation Impact on PHY layer
Time
PDSCH PDSCH
l Variant I:
PDCCH on a component carrier assigns PDSC H resources on the same component carrier (and PUSCH resources on a single linked UL compone nt carrier)
–No carrier indicator field
Variant (I) Variant (II)
l Variant II:
PDCCH on a component carrier can assign PD SCH or PUSCH resources in one of multiple com ponent carriers using the carrier indicator field
–Rel-8 DCI formats extended with 1 to 3 bit carrier i ndicator field
l In both cases, limiting the number of blind decoding is desirable
SMx-K85 – LTE-Advanced / Release 10 DL CA – Non-cross-carrier scheduling
Rel-10
SMx-K85 – LTE-Advanced / Release 10 DL CA – Cross-carrier scheduling
Rel-10
LTE Base Station Test set up
according to TS36.141
TX (TS36.141 Chapter 6)
- Chapter 6.2 : Base Station Output Power
- Chapter 6.3 : Output power dynamic range
- Chapter 6.5.1 : Frequency error
- Chapter 6.5.3 : Time alignment between transmitter branches
- Chapter 6.5.4 : Down link RS power
2011.04.21 | Title of presentation | 24
- Chapter 6.5.4 : Down link RS power
- Chapter 6.6.1 : Occupied bandwidth
- Chapter 6.6.3 : Operating band unwanted emissions
- Chapter 6.6.4 : Transmitter spurious emission
E-UTRA Test Models for thansmitter Characteristics test
l General parameters used by E-UTRA test model l Duration is 10 subframes (10ms)
l Normal CP
l UE-specific reference signals are not used
l Virtual resource blocks of localized type, no intra-subframe hopping for
PDSCH
l Type of Test models
2011.04.21 | Title of presentation | 25
l Type of Test models l E-TM1.1/ 1.2/ 2/ 3.1/ 3.2/ 3.3
l Transmitter tests shall be according to one for the E-UTRA models
TS36.141 Transmitter Characteristics Chapter 6.2 Base Station Output Power
Title Minimum Requirement in TS 36.141
Output
power
output power
output power
2011.04.21 | Title of presentation | 26
.
Propose
- OFDM symbol Max. Min. (Only PDSCH)
Specification
1.4 7.7
3 11.7
5 13.9
10 16.9
15 18.7
20 20
.
20 20
Test Signal - E-TM 3.1(at Max Power), E-TM 2 (at Min power)
LTE Signal
Test set-up
Propose -
Specification
Home BS ± 0.25 ppm
Test Signal - E-TM2, E-TM 3.1, E-TM3.2, E-TM3.3
LTE Signal
Test set-up
Propose
Specification
QPSK 17.5 %
16QAM 12.5 %
64QAM 8 %
Test Signal
Test Signal - E-TM 3.1(64QAM), E-TM 3.2(16QAM) , E-TM 3.3(QPSK), E-TM2(64QAM)
LTE Signal
Test set-up
Propose - antenna delay ( Tx diversity, MIMO transmission, Carrier Aggregation)
Specification
Test Signal - E-TM 1.1
Test set-up
TX1 Attenuator
TS36.141 Transmitter Characteristics Chapter 6.5.4 Downlink RS Power
Propose - Downlink Reference Symbol resource element power
Specification - DL RS power shall be within ±±±± 2.1 dB of the DL RS power indicated on the DL-SCH
Test Signal - E-TM 1-1
2011.04.21 | Title of presentation | 31
Note that a repeater is a bi-directional device. The signal generator may need protection.
LTE Signal
Test set-up
Propose - TX Bandwidth Bandwidth
Specification - The occupied bandwidth shall be less than the channel bandwidth
Channel bandwidth BWChannel [MHz] 1.4 3 5 10 15 20
Transmission bandwidth configuration NRB 6 15 25 50 75 100
Test Signal
Test Signal - E-TM 1.1
TS36.141 Transmitter Characteristics Chapter 6.6.2 : Adjacent channel rejection ratio (ACLR)
Propose - Pass-band center mean power mean power
Specification
[MHz]
BS adjacent channel centre fr equency offset below the first or above the last carrier centr
e frequency transmitted
Filter on the adjacent channel
frequency and corresponding
filter bandwidth
ACLR limit
1.4, 3.0, 5, 10, 15, 20 BWChannel E-UTRA of same BW Square (BWConfig) 45 dB 2 x BWChannel E-UTRA of same BW Square (BWConfig) 45 dB
BWChannel /2 + 2.5 MHz 3.84 Mcps UTRA RRC (3.84 Mcps) 45 dB BWChannel /2 + 7.5 MHz 3.84 Mcps UTRA RRC (3.84 Mcps) 45 dB
NOTE 1: BWChannel and BWConfig are the channel bandwidth and transmission bandwidth configuration of the E-UTRA transmitted signal on the assigned channel frequency.
2011.04.21 | Title of presentation | 33
channel frequency. NOTE 2: The RRC filter shall be equivalent to the transmit pulse shape filter defined in TS 25.104 [6], with a chip rate as defined in this table.
Test Signal - E-TM 1.1/ E-TM1.2
LTE Signal
Test set-up
Propose - DL operating band 10MHz , 10MHz
Specification
Frequency offset of measurement filter centre frequency, f_offset
Minimum requirement Measurement ban
dwidth (Note 1)
0 MHz ≤ f < 5 MHz 0.05 MHz ≤ f_offset < 5.05 MHz 100 kHz
5 MHz ≤ f < min(10 MHz, fmax)
5.05 MHz ≤ f_offset < min(10.05 MHz, f_offsetmax)
-14 dBm 100 kHz
10 MHz ≤ f ≤ fmax 10.05 MHz ≤ f_offset < f_offsetmax -13 dBm (Note 5) 100 kHz
2011.04.21 | Title of presentation | 34
Test Signal - E-TM 1.1 / 1.2
LTE Signal
Test set-up
Propose - 9kHz 12.75GHz Operating band unwanted emission TX
Specification ( Category A)
dth Note
9kHz - 150kHz
-13 dBm
1 kHz Note 1 150kHz - 30MHz 10 kHz Note 1 30MHz - 1GHz 100 kHz Note 1
1GHz - 12.75 GHz 1 MHz Note 2 NOTE 1: Bandwidth as in ITU-R SM.329 [2] , s4.1
NOTE 2: Bandwidth as in ITU-R SM.329 [2] , s4.1. Upper frequency as in ITU-R SM.329 [2] , s2.5 table 1
2011.04.21 | Title of presentation | 35
NOTE 2: Bandwidth as in ITU-R SM.329 [2] , s4.1. Upper frequency as in ITU-R SM.329 [2] , s2.5 table 1
Test Signal - E-TM 1.1 / 1.2
LTE Signal
Test set-up