ZTE Magic Radio1.0 Solution
Magic Radio Solution Overview Implementing negative GL guard band •
GSM LTE
Designed for flexible spectrum sharing
and scheduling between GSM and LTE in
GSM<E
GSM/LTE Band-in Spectrum Overlay
GSM/LTE Dynamic Bandwidth Extension
GSM/LTE Collaborated Spectrum Scheduling
the same spectrum band Focusing on spectrum efficiency
improvements in a re-farming scenario Maximizing spectrum efficiency by
adapting to dynamic traffic loads A powerful solution for operators with
multi-mode networks
Extending LTE bandwidth flexibly based on GSM traffic load Dynamic Supporting GSM and spectrum reLTE spectrum dynamic farming at LTE scheduling in a narrow bands granularity of 200KHz according to traffic load •
•
•
GSM Dynamic Frequency Allocation
GSM
Allocating and releasing frequency resources according to traffic load Improving GSM spectrum utilization Saving more spectrum resource for LTE •
•
•
Magic Radio Solution Overview Implementing negative GL guard band •
GSM LTE
Designed for flexible spectrum sharing
and scheduling between GSM and LTE in
GSM<E
GSM/LTE Band-in Spectrum Overlay
GSM/LTE Dynamic Bandwidth Extension
GSM/LTE Collaborated Spectrum Scheduling
the same spectrum band Focusing on spectrum efficiency
improvements in a re-farming scenario Maximizing spectrum efficiency by
adapting to dynamic traffic loads A powerful solution for operators with
multi-mode networks
Extending LTE bandwidth flexibly based on GSM traffic load Dynamic Supporting GSM and spectrum reLTE spectrum dynamic farming at LTE scheduling in a narrow bands granularity of 200KHz according to traffic load •
•
•
GSM Dynamic Frequency Allocation
GSM
Allocating and releasing frequency resources according to traffic load Improving GSM spectrum utilization Saving more spectrum resource for LTE •
•
•
Agenda 1
Magic Radio Solution Introducti Introduction on
1
Magic Radio Solution Introduction •
•
•
•
Dynamic Frequency Allocation GSM/LTE Band-in Spectrum Overlay GSM/LTE Dynamic Bandwidth Extension GSM/LTE Coordinated Spectrum Scheduling
•
Summary
Traffic Based GSM Dynamic Frequency Allocation 50 ) g 40 n a l r 30 E ( c 20 i f f a r 10 T
Traffic Tide
0
Time
1
3
5
7
9
Business Area
11
13
15
17
19
21
23
Residential Area Business Area
S666
S222
Residential Area
Traffic Tide
Improving frequency resource utilization
Reducing traffic congestion
Enhancing user satisfaction
Business Area
© ZTE Corporation. All rights reserved
5
S222
S666
Residential Area
More than 10% Spectrum Gain by GSM DFA Same Network Capacity, Less Frequency Points
14
Bandwidth
DFA
SFA
12
11.6M
0
57
11.6M
18
11M
15
10.4M
12
9.8M
9
9.2M
39 (BCCH 4*3)
GB
SFA: Static Frequency Allocation
DFA: Dynamic Frequency Allocation
100.00% 11.6
11.6
11
1
Frequency Saving Gain>10% 99.00%
•
10.4
10
9.8
9.2
97.00%
6
96.00%
4
95.00%
2
94.00% 93.00% S57+D0
GB: Guard Band
98.00%
8
0
6
Performance Loss : 1.04%
•
Traffic Model: 6TRX@80% load
S39+D18
S39+D15
Bandwidth
S39+D12 DL RQ(0~3)
S39+D9
S39+D6
UL RQ(0~3)
At same network capacity, configuration bandwidth reducing from 11.6MHz to 10.4MHz will bring negligible network performance loss (around 1%), by which frequency points saving gain is more than 10%
Uplink RQ drop rate is obviously better than downlink because of upl ink interference cancelling technology
Uplink interference cancelling technology is suggested , l ike IRC/EIRC © ZTE Corporation. All rights reserved
6
1
Magic Radio Solution Introduction •
•
•
•
Dynamic Frequency Allocation
GSM/LTE Band-in Spectrum Overlay GSM/LTE Dynamic Bandwidth Extension GSM/LTE Coordinated Spectrum Scheduling
•
Summary © ZTE Corporation. All rights reserved
7
GSM/LTE Band-in Spectrum Overlay LTE
LTE
GSM
GSM
GSM
200KHz Guard Band
200KHz Guard Band
GSM Zero Guard Band
Zero Guard Band
Traditionally, 200KHz guard band is used between GSM
and LTE network to reduce interference.
LTE
ZERO guard band or Negative guard band Available without performance degradation
GSM
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8
GSM Minus Guard Band
Minus Guard Band
GSM/LTE Band-in Spectrum Overlay Conventional GSM/LTE
Example
LTE 20MHz GSM
200KHz
1MHz
1MHz
BW 18MHz 100RB
200KHz
GSM
GSM
GSM
GSM
700KHz
200KHz
Bandwidth GL Guard Band
Allocation GSM/LTE Band-in Spectrum Overlay Solution
LTE reserved Guard Band LTE 20MHz
GSM
GSM
GSM
200KHz
700KHz
BW 18MHz 100RB
LTE central frequency can be adjusted in 100KHz step
LTE RF Bandwidth (MHz)
LTE Rb Bandwidth (MHz)
LTE Rise/Decline transition Bandwidth (KHz)
Minimum Carrier Offset ( Center to Center)
Minimum Frequency interval to LTE Spectrum Edge* (KHz)
1.4 MHz 3 MHz
1.08 MHz 2.7 MHz
160 kHz 150 kHz
0.7MHz+100k Hz 1.5MHz+100k Hz
0KHz 0KHz -100KHz -300KHz
5 MHz
4.5 MHz
250 kHz
2.5MHz+0kH z
10 MHz 15MHz
9 MHz 13.5MHz
500 kHz 750 kHz
5MHz-200kHz 7.5MHz-400k Hz
20MHz
18MHz
1000 kHz
10MHz-600kHz
-500KHz -700KHz © ZTE Corporation. All rights reserved
9
Minimum Carrier Offset Between GSM<E @Different LTE Bandwidth Frequency interval : “+” means GSM center frequency is outside the LTE frequency “-” means GSM center frequency is inside the LTE frequency
Performance Test of GL Band-in Spectrum Overlay LTE Throughput
GSM PDCH Throughput
Both LTE upload and download rate reach theoretical value
at 3 kinds of GL guard band
Both GSM PDCH upload and download rate reach
theoretical value at 3 kinds of GL guard band PDCH Throughput @ Different GL Guard Band
LTE Throughput @Different GL Guard Band 160
149.9
149.9
70
149.9
140
) s 120 p b M100 ( t u 80 p h g 60 u o r h 40 T
51
50.6
49.7
20
) s 60 p b k ( 50 t u p h 40 g u o r 30 h T 20 H C D10 P
54.7
54.6
54.6
57.35
57.23
0
0
Download Download 1MHz Guard Band 0KHz Guard Band
Upload -700KHz Guard Band
1MHz Guard Band
Upload 0KHz Guard Band
-700KHz Guard Band
GSM and LTE upload and download service works well both at zero GL guard band scenario and at negative guard band scenario with 2*(20M LTE cell +4 GSM TRX) dual mode configuration © ZTE Corporation. All rights reserved
10
57.35
1
Magic Radio Solution Introduction •
•
•
•
Dynamic Frequency Allocation GSM/LTE Band-in Spectrum Overlay
GSM/LTE Dynamic Bandwidth Extension GSM/LTE Coordinated Spectrum Scheduling
•
Summary © ZTE Corporation. All rights reserved
11
GSM/LTE Dynamic Bandwidth Extension (DBE) DBE Principle
BTS/eNB
iCS (CSS Server)
LTE 10M
GSM/LTE Dynamic Sharing
LTE
GSM
GSM/LTE Dynamic Sharing
BTS and eNB are deployed at the same area
When GSM released shared BW, LTE will decide whether to extend its BW
The candidate LTE BW extension set is [3MHz,5MHz],[5MHz,10MHz],[10MHz,15MHz] and [15MHz,20MHz]
When GSM traffic load increases, eNB MUST release the shared BW for GSM
GSM LTE 5M
© ZTE Corporation. All rights reserved
12
eNB
BTS
GSM BW usage status
GSM/LTE Dynamic Bandwidth Extension (DBE) GSM
LTE 5M
GSM
Daytime Voice Focus
Dynamic Sharing
GSM
Nighttime Data Focus
Between GSM/LTE
LTE 10M
LTE 5M
GSM
LTE
GSM
GSM
Working Hour
LTE
Data Traffic Busy Hour © ZTE Corporation. All rights reserved
13
GSM
LTE 10M
GSM
1
Magic Radio Solution Introduction •
•
•
•
Dynamic Frequency Allocation GSM/LTE Band-in Spectrum Overlay GSM/LTE Dynamic Bandwidth Extension
GSM/LTE Coordinated Spectrum Scheduling
•
Summary © ZTE Corporation. All rights reserved
14
GSM/LTE Collaborated Spectrum Scheduling CSS Principle
GSM cell frequency usage status
eNB
BTS BTS/eNB
iCS (CSS Server)
BTS and eNB are deployed at the same area
GSM has higher priority than LTE when using GSM/LTE collaborated scheduling spectrum
GSM
can
schedule
in
200KHz
granularity
at
GSM/LTE
collaborated scheduling spectrum
GSM Dedicated
GSM/LTE Collaborated Scheduling
LTE Dedicated
GSM/LTE Collaborated Scheduling
GSM Dedicated
In GSM/LTE collaborated scheduling spectrum, when GSM released spectrum, LTE can decide whether to use it
© ZTE Corporation. All rights reserved
15
GSM/LTE Collaborated Spectrum Scheduling 3.6M
e r S o S f e C B
GSM
1.5MHz
Wasted
5MHz
1.3MHz
Wasted
LTE
3.6M
GSM
15MHz
LTE Bandwidth
Total BW:15MHz
Before CSS: GSM 7.2MHz+LTE 5MHz
After CSS, 1.8MHz BW within LTE 10MHz BW will
5MHz -> 10MHz
be used dynamically based on GSM traffic load
LTE 10MHz
2.6MHz
S S C r e t f A
0.8MHz
GSM
GSM/LTE Dynamic Sharing
1MHz
LTE 15MHz © ZTE Corporation. All rights reserved
16
LTE central frequency keeps unchanged
GSM/LTE Dynamic Sharing
2.4MHz
GSM
1
Magic Radio Solution Introduction •
•
•
•
Dynamic Frequency Allocation GSM/LTE Band-in Spectrum Overlay GSM/LTE Dynamic Bandwidth Extension GSM/LTE Coordinated Spectrum Scheduling
•
Summary © ZTE Corporation. All rights reserved
17
Magic Radio Improving Spectrum Efficiency 20M@1800MHz GSM LTE
GSM + LTE Static Configuration DFA + GL Band-in Spectrum Overlay
GSM
LTE
GSM
LTE BW
5.8 M
5M
5.8M
5M
5M
10 M
5M
10M DFA + GL Band-in Spectrum Overlay + GL DBE
2.5 M
15 M
2.5 M
GL Band-in Spectrum Overlay + GL CSS
2.5M
15M
2.5 M
GL Band-in Spectrum Overlay + GL CSS
GL Cell Throughput (Mbps)
130%
DFA + GL Band-in Spectrum Overlay + GL DBE
39.2M DFA + GL Band-in Spectrum Overlay GSM/LTE Static Configuration (20M)
© ZTE Corporation. All rights reserved
18
15M
93%
115%
Agenda
2
Case Study
Magic Radio Solution Successful Verification in Field Network GSM/LTE CSS
Dec. 2015
GSM/LTE Band-in Spectrum Overlay
ZTE helps China Unicom improve total bandwidth throughput and spectrum
Nov. 2015
efficiency by more than 40%
GSM/LTE DBE
Dynamic Frequency Allocation
May 2015
Aug. ZTE helps China Mobile achieve the same network
2015
capacity with only 65% spectrum resources
© ZTE Corporation. All rights reserved
20
GSM received more available spectrum while the LTE network download rate remained stable
ZTE helps China Unicom improve spectrum efficiency by more than 50% and double LTE download rates regardless of user location
2
Case Study •
•
•
•
Dynamic Frequency Allocation GSM/LTE Band-in Spectrum Overlay GSM/LTE Dynamic Bandwidth Extension GSM/LTE Coordinated Spectrum Scheduling © ZTE Corporation. All rights reserved
21
GSM DFA Field Proven in CMCC - Network Configuration Network Configuration
Test area is configured as DFA zone and buffer zone
DFA zone are located at central area with high traffic load
Buffer zone are used to isolate DFA sites from interference
For the frequencies •
•
Used only in DFA zone as dynamic frequency Used both in DFA zone as dynamic frequency and buffer zone
Frequency hopping should be disabled Site Number
Cells Number
TRX Number
Max Site Configuration
DFA Zone
13
39
193 (BCCH+TCH)
S4/10/6
Buffer Zone
10
-
-
-
DFA zone (13 sites)
Test Location: Hunan Jishou, CMCC
© ZTE Corporation. All rights reserved
22
Buffer zone(10 sites)
GSM DFA Field Proven in CMCC - Frequency Allocation Before DFA
After DFA
BCCH Frequency Allocation
23
23
TCH Frequency Allocation
71
38
Frequency Allocation Before DFA
Cell1
Cell2
Cell3
BCCH Frequency 1
BCCH Frequency 2
BCCH Frequency 3
Frequency Numbers(BCCH+TCH) 100
TCH Frequency 1
TCH Frequency 2
TCH Frequency 3
35% Frequency Saving Gain
90 80 70 60 50 40
After DFA
30
Cell1/Cell2/Cell3
20 10
BCCH Frequency 1
BCCH Frequency 2
BCCH Frequency 3
Dynamic Frequency pool for TCH TRX
0 Before DFA
After DFA
All non-BCCH TRX are using frequency in dynamic frequency pool
More frequency can be used for LTE to improve user experience © ZTE Corporation. All rights reserved
23
GSM DFA Field Proven in CMCC - Test Result 0.50%
Voice Service Test Result
99.00%
0.40% 0.30%
99.50%
Data Service Test Result
100.00% 99.50%
98.50%
Before DFA
After DFA
0.20%
98.00% 97.50%
99.00% 98.50%
97.00%
0.10%
96.50% 96.00%
0.00%
95.50%
-0.10%
95.00%
Call Drop Rate (Including Handover)
Before DFA
98.00% 97.50% 97.00%
DL EGPRS TBF Establishment Success Rate
DL RQ(0~3) Ratio
Drive Test Route
DL GPRS TBF Establishment Success Rate
For Voice service, CDR and DL RQ(0~3) kept stable
For data service, DL GPRS/EDGE TBF establishment success rate has a bit fluctuation with negligible performance loss
with CMCC Drive Test Equipment ATU © ZTE Corporation. All rights reserved
24
After DFA
2
Case Study •
•
•
•
Dynamic Frequency Allocation
GSM/LTE Band-in Spectrum Overlay GSM/LTE Dynamic Bandwidth Extension GSM/LTE Coordinated Spectrum Scheduling © ZTE Corporation. All rights reserved
25
GSM/LTE Band-in Spectrum Overlay Field Proven in China Unicom LTE 20MHz+LTE 10MHz + 12 GSM frequency configuration within 30MHz BW
2*100K at both ends for interference isolation from other operator
30MHz BW from 1830MHz to 1860MHz
LTE 20MHz cell effective RB is closely adjacent to that of 10MHz cell
100KHz
1831.4
Guard band
1840.9
1831.7 1831.9
BW 9MHz 50RB
GSM 1.6MHz 1830.1 1830MHz
1841.4
10MHz
200KHz
central frequency 1836.4MHz
100KHz
central frequency 1849.9MHz
200KHz
GSM
BW 18MHz 100RB
1839.9
Guard band
0.8MHz 1858.9 1859.1 1859.9
20MHz
1860MHz
China Unicom, Chongqing
200
LTE Download Rate(Mbps) @ Drive Test
Nov, 2015
150
GL band-in spectrum overlay feature is deployed at GSM and LTE co-site network
GSM obtains more available spectrum from the LTE reserved bandwidth while LTE download rates keeping stable
CA(10MHz LTE cell and 20MHz LTE cell) can be used with GL band-in spectrum overlay
100
79.91
50 0
© ZTE Corporation. All rights reserved
26
80.2
LTE DT Only
GSM<E DT
GSM/LTE Band-in Spectrum Overlay Field Proven in China Unicom MOS @LTE&GSM Terminal GSM MOS
LTE Download Rate(Mbps) 200
5
GSM<E
150
4.5
GSM and LTE
LTE and GSM 4
100
3.5
50
3
0
Closer
LTE Only
GSM Only
Network Closer
Furthe
Performance
Further
The test location is moving away from base station gradually
•
GSM/LTE Band-in
GSM voice service MOS fluctuates in a normal range
•
LTE DL throughput is almost the same after enabling the feature
Spectrum Overlay
•
LTE Upload Rate(Mbps) 35 30
GSM MOS 16
30
14
25
25 12
20
LTE download and upload rate
kept stable CA between 10 MHz and 20
MHz works well with G/L bandin spectrum overlay
Both GSM and LTE network
operates well
20
4
LTE upload rate had a slight fluctuation at different
•
10 10
10 8
5 0
6 GSM UE Output Power
LTE Upload Rate
3.5
5
GSM UE output power scenario With different LTE UE output power, GSM services
•
0
3 LTE UE Output Power
MOS
run normally
© ZTE Corporation. All rights reserved
27
4.5
15
15
fluctuates in a normal range
Before & After
GSM voice service MOS
2
Case Study •
•
•
•
Dynamic Frequency Allocation GSM/LTE Band-in Spectrum Overlay
GSM/LTE Dynamic Bandwidth Extension GSM/LTE Coordinated Spectrum Scheduling © ZTE Corporation. All rights reserved
28
GSM/LTE DBE Field Proven in China Unicom China Unicom Configuration
Aug, 2015
Industry unique GSM/LTE DBE feature was
Before DBE
GSM 7MHz+LTE 3MHz
After DBE
GSM 5MHz + LTE 5MHz
commercially launched and successfully proven
in China Unicom field network First commercial application in industry
Total BW 10MHz with GSM 7MHz+LTE 3MHz configuration
LTE 3MHz BW can be extended to 5MHz BW when GSM
supporting dynamic spectrum re-farming
traffic load is lower than given threshold
solution at LTE narrow band with GSM/ LTE DBE
feature
release the sharing 2MHz spectrum for GSM in a normal way
When GSM traffic load is higher than given threshold, LTE LTE 5M
Spectrum Efficiency improving more than 50%
User experience can be further enhanced with
CA technology Achieving better user experience & satisfaction
G/L Dynamic Sharing GSM 1832.5MHz 1830MHz
1833.5MHz
© ZTE Corporation. All rights reserved
29
G/L Dynamic Sharing
LTE 3M 1836.5MHz
GSM 1837.5MHz 1840MHz
GSM/LTE DBE Field Proven in China Unicom GSM<E
•
Spectrum efficiency improvement >50%
40
For DT test, LTE downl oad rate improved
•
Network
around 100%
Performance Before & After DBE
For CQT test, LTE download and upload rate
10
Cell Center
GSM CS and PS services run normally
Middle of Cell
Sourece BW: 3MHz
15
15
126%
0
doubled regardless of user location
GL Cell Throughput (Mbps)
Cell Edge
Extension BW: 5MHz
LTE Upload Rate (Mbps) @CQT Test
LTE Average Rate (Mbps) @Drive Test 10
23.3
56%
135%
90%
10
GSM/LTE DBE
30 20
•
•
LTE Download Rate (Mbps) @CQT Test
>50%
5
5
0 Cell Center
GSM/LTE Static Configuration (10MHz)
Middle of Cell
Cell Edge
0 Download
Soure BW: 3MHz
Upload
Source BW:3MHz
ExtensionBW: 5MHz
Extesnsion BW:5MHz
Cell edge users enjoyed more than 100%
•
Achieving >50% spectrum efficiency improvement
•
compared with conventional static configuration
Around 100% download rate improvement
•
More than 50% upload rate enhancement
•
© ZTE Corporation. All rights reserved
30
throughput enhancement both UL and DL User satisfaction was obviously promoted
•
2
Case Study •
•
•
•
Dynamic Frequency Allocation GSM/LTE Band-in Spectrum Overlay GSM/LTE Dynamic Bandwidth Extension
GSM/LTE Coordinated Spectrum Scheduling
GSM/LTE CSS Field Proven in China Unicom China Unicom QuanZhou Nov, 2015
Total 30MHz BW can be configured as LTE 20MHz+LTE 5MHz+GSM 7MHz in max.
2MHz spectrum dynamic sharing for GSM within LTE 20MHz spectrum after CSS is
activated Spectrum efficiency is improved by more than 40%
User experience is enhanced significantly 1840
1833.5 1836.5 LTE 3MHz
GSM 30MHz BW from 1830MHz to 1860MHz
After CSS
GSM 5MHz + LTE 5MHz +LTE 20MHz
GSM
LTE
3.5MHz
3.5MHz 1830MHz
1860MHz
1832.5
Configuration Before CSS GSM 7MHz+LTE 3MHz+LTE 20MHz
LTE
LTE 20MHz
1837.5
LTE 20MHz
LTE 5MHz
GSM 2.5MHz 1830MHz
LTE
GSM 2.5MHz
LTE
1840
1MHz
1MHz
GSM<E Dynamic
GSM<E Dynamic
1860MHz
GSM/LTE CSS Field Proven in China Unicom
GSM/LTE CSS
Spectrum Efficiency Improvement
GSM DL RQ(0~3) Ratio
100.00%
GL Cell Throughput (Mbps)
99.00%
82.6
46%
GSM/LTE cell throughput increases
•
98.00% 97.00%
significantly after CSS is activated while
96.00%
GSM works well
95.00%
Achieving >40% spectrum efficiency
•
GSM/LTE Static Configuration (20MHz)
94.00% Day1
Day2
Day3
Day4
CSS Off
LTE Download Rate @ CQT Test
Day5
Day6
Day7
improvement comparing with static configuration
CSS On
User Experience Enhancement
LTE Cell DL Throughput
160.00
User at 20MHz cell with CSS has almost
45.00
140.00
•
40.00
120.00
the same download rate as 20MHz cell
53%
35.00
100.00
30.00
80.00
without CSS
25.00
60.00 40.00
20.00
20.00
15.00
0.00
10.00 Cell Center
Middle of Cell
20MHz BW with CSS
20MHz BW
Cell Edge
With CSS feature, LTE 3MHz cell is possible
•
to be configured as LTE 5MHz cell, which
5.00
brings more than 50% DL throughput
0.00 Before CSS
After CSS
improvement
