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The subscriber on the cell edge will have bad experience due to impact of this co-channel interference. There is function of SFR (Soft Frequency Reuse) in LTE-TDD that is manipulated BW into several cell edge style. On Genex U-Net we can use this feature to minimize of inter cell interference, we can chose static ICIC or adaptive ICIC based on field condition.
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Security Level:
TD-LTE 2.3 GHz Simulation (ICIC implementation)
4G Radio Network Planning
Author/ Email: [email protected]
Version: V2.0(20121225)
Page 2
Content
1 Overview of SFR & ICIC Feature on TD-LTE
2 Coverage Prediction of TD-LTE with SFR
3 Summary
Page 3
IIC Solution for High Density Deployment
NF/CoMP
ICIC/FSS/aICIC
SFN/aSFN
Site Density
High Site Density Requires Interference Controlling and Inter-BB Co-Ordination
Rich Experience: 23 LTE TDD Network, 100+ WiMAX
Network, 110K TDS-CDMA sites in CMCC
SFN ensure Japan’s No.1 user experience
Site density: 10 site /km^2, Test results in SoftBank
Huawei unique solution for capacity increasing
2dB
Cell Edge = Worst 5% Field Test Records
Cell Edge 2dB Gain, 60% UE Edge Throughput Gain
60%+
7-30% Edge UE Gain
40-60% Edge UE Gain
NoEdge
IIC: Intelligent Interference Coordination and Control
Page 4
Adaptive ICIC: Improve 30% Cell Edge Throughput
Adaptive ICIC switch on / off Support cell edge frequency
reuse (1, 1/3, 1/6).
Frequency: reuse=1Frequency: reuse=3
Cell Edge Interference
High
Cell edge interference lead to low throughput
Unique cell edge frequency reuse 6 in telecom industry
Adaptive ICIC:
Cell Edge Throughput
Low Cell Edge Interference
Low
Cell Edge Throughput
30%improved
eCoordinator
Page 5
Content
1 Overview of SFR & ICIC Feature on TD-LTE
2 Coverage Prediction of TD-LTE with ICIC
3 Summary
Page 6
SINR Coverage with Adaptive ICICSINR Coverage without ICIC
Comparison of Implementation ICIC - SINR
In TD-LTE configuration 1x3x1 all sector using same resource carrier, the disadvantage of using single frequency is in the cell edge, end user equipment will deteriorate of signal quality due to UE receive same frequency that will impact as interferer. In this simulation UE using Smartphone in the outdoor case.
Adaptive ICIC is the most powerful feature to minimize interference in the cell edge, this type of SFR will divided BW in 6 style of cell edge. In the center of cell SINR size better than using static ICIC.
Page 7
SINR Coverage with Static ICIC
Comparison of Implementation ICIC - SINR
SINR Coverage without ICIC
In TD-LTE configuration 1x3x1 all sector using same resource carrier, the disadvantage of using single frequency is in the cell edge, end user equipment will deteriorate of signal quality due to UE receive same frequency that will impact as interferer. In this simulation UE using Smartphone in the outdoor case.
By using SFR (Soft Frequency Reuse), same like FFR (Fractional Frequency Reuse) in WiMAX technology. The Bandwidth divided into 3 style of edge, which 1/3 BW will be used in cell edge then 2/3 BW will be used in the center of cell. This method to minimize interference and improve the cell edge throughput.
Page 8
Without ICICWith Static ICICWith Adaptive ICIC
Comparison of Implementation ICIC - SINR (Animation)
Page 9
Comparison of Implementation ICIC – SINR Statistic
There is SINR improvement with using ICIC feature, Adaptive ICIC show the best improvement than Static ICIC
Page 10
Radio Bearer Coverage with Static ICICRadio Bearer Coverage without ICIC
Comparison of Implementation ICIC – Radio Bearer
TD-LTE modulation coding scheme without implementing ICIC is much degraded in the cell edge, especially in the inner city. End User in the cell edge will get QPSK as the highest MSC that serving their UE.
After implementing AFP function in U-Net for static ICIC we get better improvement in the cell edge area. Bur on the center of coverage cell radius of MCS 64 QAM will be reduce.
Page 11
Radio Bearer Coverage with Adaptive ICICRadio Bearer Coverage without ICIC
Comparison of Implementation ICIC – Radio Bearer
TD-LTE modulation coding scheme without implementing ICIC is much degraded in the cell edge, especially in the inner city. End User in the cell edge will get QPSK as the highest MSC that serving their UE.
After conduct AFP with adaptive ICIC, the cell edge is better than static ICIC. And the cell radius of MCS 64 QAM is more longer than static ICIC.
Page 12
Comparison of Implementation ICIC – Radio Bearer (Animation)
Without ICICWith Static ICICWith Adaptive ICIC
Page 13
DL Throughput Coverage with Static ICICDL Throughput Coverage without ICIC
Comparison of Implementation ICIC – DL Throughput
In TD-LTE without activating ICIC, we can see much of area in the inner city with low DL Throughout due to impact of interference from same frequency that receive by UE.
After implementing static ICIC, there are much improvement for DL Throughput than before. End user experience will be increase while interference impact decrease.
Page 14
DL Throughput Coverage with Adaptive ICICDL Throughput Coverage without ICIC
Comparison of Implementation ICIC – DL Throughput
In TD-LTE without activating ICIC, we can see much of area in the inner city with low DL Throughout due to impact of interference from same frequency that receive by UE.
After implementing adaptive ICIC, cell edge DL Throughput are better than static ICIC, really recommend to using this feature to manipulate lack of customer BW resource.
Page 15
Without ICIC
Comparison of Implementation ICIC – DL Throughput (Animation)
With Static ICICWith Adaptive ICIC
Page 16
Comparison of Implementation ICIC – DL Throughput Statistic
This graphic show the cumulative of DL Throughput from all coverage, even the cumulative of TD-LTE without ICIC is better, but the this is just focus on center of center of cell coverage. The cell edge throughput is better after implementing of ICIC
Page 17
Content
1 Overview of SFR & ICIC Feature on TD-LTE
2 Coverage Prediction of TD-LTE with SFR
3 Summary
Page 18
Summary
• DL Static ICIC (SFR 1x3x1)
• DL Adaptive ICIC (SFR 1x3x1)
Frequency: reuse=6
eCoordinator
Adaptive frequency reuse pattern selection: The system automatically selects an appropriate edge frequency allocation pattern for each cell. The patterns for allocating cell edge frequencies are as follows: Reuse1, Reuse3, and Resue6. These patterns can be flexibly used in different scenarios. For example, reuse1 is used in the low interference scenario, reuse3 is used in medium interference scenario and reuse6 is used in the high interference with mass neighbor cells scenario.
Static ICIC： cell center use 2/3 band， cell edge use 1/3 band ； so, in cell edge, frequency reuse 3, different cell edge use different frequency. Tx power in cell center lower than cell edge Tx power to control interference.
Thank you
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