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www.huawei.com
Copyright © 2016 Huawei Technologies Co., Ltd. All rights reserved.
DT FAQS
2 Huawei Confidential
Contents
1 Overview of DT FAQS
2 Coverage FAQS
3 interference FAQS
4 Speed FAQS
3 Huawei Confidential
-3-
LTE DT FAQS
Problem
Category
Subcategory Problem Description Solution
Coverage
problems
Poor coverage
The RSRP of LTE signals on a road is less than
-110(-105) and lasts for a certain distance.
1. Optimize the RF (downtilt angle).
2. Increase the cell transmit power. 3. Replace
high-gain antennas. 4. Add new sites.
Overshoot coverage
The RSRP of the cell signal of site A is
continuously greater than that of site B
within the main coverage area of BTS B.
1. RF optimization 2. Decrease the cell transmit
power 3. Decrease the antenna height.
Interfere
nce
problems
Intra-frequency
interference( Overlap
ping coverage)
Two or more intra-frequency LTE signals with
the same strength are generated on a road
section. The larger the number of
interference signals, the smaller the
difference in strength, and the more severe
the interference
Select a primary coverage cell to enhance the
signal strength of the primary coverage cell
and reduce the interference signal strength.
Mod 3 interference
The strength of the serving cell is the same as
that of the neighboring cell, and the PCI
mod3 of the serving cell is the same as that
of the neighboring cell.
1. Change the signal strength of the serving
cell or neighboring cell through RF
optimization. 2. Change the PCI of the serving
cell or neighboring cell.
Ho-
problems
Ho failure or not ho
Missing neighboring cells, incorrect external
cell definition, or improper parameters
Add neighbor relationships and modify
external cells or handover parameters.
Alms All kinds of alms Hardware fault, VSWR,out-of-synchronization Troubleshooting and Clearing Alarms
4 Huawei Confidential
Contents
1 Overview of DT FAQS
2 Coverage FAQS
3 interference FAQS
4 Speed FAQS
5 Huawei Confidential
Conventional antenna coverage diagram
6 Huawei Confidential
• Multi-pole realize beamforming
• Coverage improved by BCH, SCH, CSI-RS channels
beamforming
× × × × × × × ×
× × × × × × × ×
× × × × × × × ×
× × × × × × × ×
× × × × × × × ×
× × × × × × × ×
× × × × × × × ×
× × × × × × × ×
× × × × × × × ×
× × × × × × × ×
× × × × × × × ×
× × × × × × × ×
64T64R/32T32R
Horizontal beam Vertical beam
• NR beamforming is more accurate
• Better SINR, decrease interference
5G NR narrow beam 5G NR narrow beam improves H+V coverage
LTE Wide
Beam
5G Massive MIMO Narrow Beam
7 Huawei Confidential
Case1:poor coverage due to excessive inter-site distance
Poor Coverage Scenario
Case2:poor coverage due to Optimization Reason
Confirm with the customer whether the site can be added. Check the nearest site OXLP54, RF problems or alarm or power
and so on
8 Huawei Confidential
Case1:Overshoot coverage due to Weak coverage of the
main control cell
overshoot Coverage Scenario
OXLM18U overshoot& main cell OXLPU62 poor coverage , Check
the nearest site OXLP54, RF problems alarms powerho-
parameter and so on
Case2:
CELL OXL5N2H Overshoot ,should increase the e-tilt of this cell
9 Huawei Confidential
Overlapping overview
10 Huawei Confidential
Contents
1 Overview of DT FAQS
2 Coverage FAQS
3 interference FAQS
4 Speed FAQS
11 Huawei Confidential
FDD LTE interference types include external
interference, intermodulation interference, blocking
interference, and neighboring cell interference.
External interference:
1. Interference does not
match the cell bandwidth.
2. Interference is not related
to the traffic volume.
intermodulation interference:
1. Co-antenna with other RATCs to form X-order
intermodulation or LTE intermodulation.
2. The system power of the interference source
increases, and the interference increases accordingly.
blocking interference:
High-power signals exist in the frequency bands supported by the RRU.
Wideband
or
narrowband
interference
RRU支持带宽
Strong
out-of-
band
interference
Neighboring cell interference:
1. Interference has PUSCH/PUCCH
characteristics.
2. Interference is closely related to
traffic volume.
100RB指标
PUSCH
LTE interference
input signal output signal
linear
system
nonlinear
system
12 Huawei Confidential
Mod 3 interference
Formation of Modular 3 Interference
According to 3GPP specifications, each RB has four cell
reference signals (CRSs). It is stipulated in frequency
domain that there is one CRS in every six subcarriers,
and it is stipulated in time domain that the CRS is
located in the first symbol and the fifth symbol. Because
the LTE system uses dual antennas mostly to transmit
and receive data, there are actually three cases for a
location of the CRS in the RB:
If CRSs have the same location in the RB, this is called modulo 3
collision, also called modulo 3 interference. There are only three
possible positions of the CRS in the RB. Therefore, when signals of
four or more cells are transmitted at the same location, a modulo 3
conflict is inevitable.
Optimization of Mod 3 Interference
1. Adjust the antenna. adjust the azimuth/tilt to change the coverage
area of the interfering cell. On the other hand, adjust the downtilt to
reduce the overlapping coverage area of the two cells.
2. Adjust the transmit power of the interfering cell. This reduces the
level of the interfering signal, increases the SINR, and optimizes the
user rate. This method is most commonly used in live network
optimization, but affects the cell coverage capability.
3. Change the PCI of a cell. This is the most critical solution. It can
completely resolve the mod-3 interference in a certain area. However,
because there are only three possible options for mod-3 interference,
changing the PCI usually resolves the mod-3 interference. But modulo-
three interference occurs in another place, so this method, while good,
can only be used in rare cases.
13 Huawei Confidential
Case1: coverage
Typical Cases for bad sinr
Case2: interference
14 Huawei Confidential
LTE-NR co-channel interference comparison
Both LTE and NR are OFDM symbols. The subcarrier spacing is
similar, the frame length and slot assignment are the same, and
the real-time domain and frequency domain are aligned. Co-
channel interference between LTE and NR occurs in the
following three aspects:
 LTE interference to NR:
 LTE CRSs are continuously transmitted
(about 10% of all REs).
 LTE wide beams and large overlapping
areas
 The LTE load is high.
Characteristics of interference
between LTE and NR
LTE
CRS
NR
CSI-RS
PBCH/SSS/PSS :LTE continuously transmits data on a wide
beam. NR supports a maximum of eight narrow beams for
polling and randomizing interference.
Reference signal (pilot):LTE CRSs are continuously sent. However,
NR does not have CRSs and uses CSI-RSs. CSI-RSs are sent only
when UEs are scheduled. This greatly reduces co-channel
interference.
NR
LTE
 Interference from NR to LTE
 NR CRS Free, no interference to
neighboring cells when no load occurs
 NR narrow beam, interference
randomization
 NR light load
Data subcarrier: LTE and NR transmit data subcarriers only when
there is data to be transmitted.
15 Huawei Confidential
Contents
1 Overview of DT FAQS
2 Coverage FAQS
3 interference FAQS
4 Speed FAQS
16 Huawei Confidential
Classification of rate-related problems
Wireless side:
1. Coverage;
2. Interference.
3. Neighboring.
4. Grant
5. Prb high load(high prb usage)
Parameters:
1. Network camping policy.
2. Ho parameters.
3. Feature parameters.
others:
1. Transmission probems: Transmission limited, Transmission
Intermittent Disconnection.
2. Core network problems.
3. Terminal problems.
4. FTP service problem
5. Test Method and Process
6. Drving speed
Thank You
www.huawei.com
Copyright © 2018 Huawei Technologies Co., Ltd. All Rights Reserved.
The information in this document may contain predictive statements including, without limitation, statements regarding the future financial
and operating results, future product portfolio, new technology, etc. There are a number of factors that could cause actual results and
developments to differ materially from those expressed or implied in the predictive statements. Therefore, such information is provided for
reference purpose only and constitutes neither an offer nor an acceptance. Huawei may change the information at any time without notice.

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5-LTE-DT FAQS EMERSON EDUARDO RODRIGUES.pptx

  • 1. www.huawei.com Copyright © 2016 Huawei Technologies Co., Ltd. All rights reserved. DT FAQS
  • 2. 2 Huawei Confidential Contents 1 Overview of DT FAQS 2 Coverage FAQS 3 interference FAQS 4 Speed FAQS
  • 3. 3 Huawei Confidential -3- LTE DT FAQS Problem Category Subcategory Problem Description Solution Coverage problems Poor coverage The RSRP of LTE signals on a road is less than -110(-105) and lasts for a certain distance. 1. Optimize the RF (downtilt angle). 2. Increase the cell transmit power. 3. Replace high-gain antennas. 4. Add new sites. Overshoot coverage The RSRP of the cell signal of site A is continuously greater than that of site B within the main coverage area of BTS B. 1. RF optimization 2. Decrease the cell transmit power 3. Decrease the antenna height. Interfere nce problems Intra-frequency interference( Overlap ping coverage) Two or more intra-frequency LTE signals with the same strength are generated on a road section. The larger the number of interference signals, the smaller the difference in strength, and the more severe the interference Select a primary coverage cell to enhance the signal strength of the primary coverage cell and reduce the interference signal strength. Mod 3 interference The strength of the serving cell is the same as that of the neighboring cell, and the PCI mod3 of the serving cell is the same as that of the neighboring cell. 1. Change the signal strength of the serving cell or neighboring cell through RF optimization. 2. Change the PCI of the serving cell or neighboring cell. Ho- problems Ho failure or not ho Missing neighboring cells, incorrect external cell definition, or improper parameters Add neighbor relationships and modify external cells or handover parameters. Alms All kinds of alms Hardware fault, VSWR,out-of-synchronization Troubleshooting and Clearing Alarms
  • 4. 4 Huawei Confidential Contents 1 Overview of DT FAQS 2 Coverage FAQS 3 interference FAQS 4 Speed FAQS
  • 5. 5 Huawei Confidential Conventional antenna coverage diagram
  • 6. 6 Huawei Confidential • Multi-pole realize beamforming • Coverage improved by BCH, SCH, CSI-RS channels beamforming × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × 64T64R/32T32R Horizontal beam Vertical beam • NR beamforming is more accurate • Better SINR, decrease interference 5G NR narrow beam 5G NR narrow beam improves H+V coverage LTE Wide Beam 5G Massive MIMO Narrow Beam
  • 7. 7 Huawei Confidential Case1:poor coverage due to excessive inter-site distance Poor Coverage Scenario Case2:poor coverage due to Optimization Reason Confirm with the customer whether the site can be added. Check the nearest site OXLP54, RF problems or alarm or power and so on
  • 8. 8 Huawei Confidential Case1:Overshoot coverage due to Weak coverage of the main control cell overshoot Coverage Scenario OXLM18U overshoot& main cell OXLPU62 poor coverage , Check the nearest site OXLP54, RF problems alarms powerho- parameter and so on Case2: CELL OXL5N2H Overshoot ,should increase the e-tilt of this cell
  • 10. 10 Huawei Confidential Contents 1 Overview of DT FAQS 2 Coverage FAQS 3 interference FAQS 4 Speed FAQS
  • 11. 11 Huawei Confidential FDD LTE interference types include external interference, intermodulation interference, blocking interference, and neighboring cell interference. External interference: 1. Interference does not match the cell bandwidth. 2. Interference is not related to the traffic volume. intermodulation interference: 1. Co-antenna with other RATCs to form X-order intermodulation or LTE intermodulation. 2. The system power of the interference source increases, and the interference increases accordingly. blocking interference: High-power signals exist in the frequency bands supported by the RRU. Wideband or narrowband interference RRU支持带宽 Strong out-of- band interference Neighboring cell interference: 1. Interference has PUSCH/PUCCH characteristics. 2. Interference is closely related to traffic volume. 100RB指标 PUSCH LTE interference input signal output signal linear system nonlinear system
  • 12. 12 Huawei Confidential Mod 3 interference Formation of Modular 3 Interference According to 3GPP specifications, each RB has four cell reference signals (CRSs). It is stipulated in frequency domain that there is one CRS in every six subcarriers, and it is stipulated in time domain that the CRS is located in the first symbol and the fifth symbol. Because the LTE system uses dual antennas mostly to transmit and receive data, there are actually three cases for a location of the CRS in the RB: If CRSs have the same location in the RB, this is called modulo 3 collision, also called modulo 3 interference. There are only three possible positions of the CRS in the RB. Therefore, when signals of four or more cells are transmitted at the same location, a modulo 3 conflict is inevitable. Optimization of Mod 3 Interference 1. Adjust the antenna. adjust the azimuth/tilt to change the coverage area of the interfering cell. On the other hand, adjust the downtilt to reduce the overlapping coverage area of the two cells. 2. Adjust the transmit power of the interfering cell. This reduces the level of the interfering signal, increases the SINR, and optimizes the user rate. This method is most commonly used in live network optimization, but affects the cell coverage capability. 3. Change the PCI of a cell. This is the most critical solution. It can completely resolve the mod-3 interference in a certain area. However, because there are only three possible options for mod-3 interference, changing the PCI usually resolves the mod-3 interference. But modulo- three interference occurs in another place, so this method, while good, can only be used in rare cases.
  • 13. 13 Huawei Confidential Case1: coverage Typical Cases for bad sinr Case2: interference
  • 14. 14 Huawei Confidential LTE-NR co-channel interference comparison Both LTE and NR are OFDM symbols. The subcarrier spacing is similar, the frame length and slot assignment are the same, and the real-time domain and frequency domain are aligned. Co- channel interference between LTE and NR occurs in the following three aspects:  LTE interference to NR:  LTE CRSs are continuously transmitted (about 10% of all REs).  LTE wide beams and large overlapping areas  The LTE load is high. Characteristics of interference between LTE and NR LTE CRS NR CSI-RS PBCH/SSS/PSS :LTE continuously transmits data on a wide beam. NR supports a maximum of eight narrow beams for polling and randomizing interference. Reference signal (pilot):LTE CRSs are continuously sent. However, NR does not have CRSs and uses CSI-RSs. CSI-RSs are sent only when UEs are scheduled. This greatly reduces co-channel interference. NR LTE  Interference from NR to LTE  NR CRS Free, no interference to neighboring cells when no load occurs  NR narrow beam, interference randomization  NR light load Data subcarrier: LTE and NR transmit data subcarriers only when there is data to be transmitted.
  • 15. 15 Huawei Confidential Contents 1 Overview of DT FAQS 2 Coverage FAQS 3 interference FAQS 4 Speed FAQS
  • 16. 16 Huawei Confidential Classification of rate-related problems Wireless side: 1. Coverage; 2. Interference. 3. Neighboring. 4. Grant 5. Prb high load(high prb usage) Parameters: 1. Network camping policy. 2. Ho parameters. 3. Feature parameters. others: 1. Transmission probems: Transmission limited, Transmission Intermittent Disconnection. 2. Core network problems. 3. Terminal problems. 4. FTP service problem 5. Test Method and Process 6. Drving speed
  • 17. Thank You www.huawei.com Copyright © 2018 Huawei Technologies Co., Ltd. All Rights Reserved. The information in this document may contain predictive statements including, without limitation, statements regarding the future financial and operating results, future product portfolio, new technology, etc. There are a number of factors that could cause actual results and developments to differ materially from those expressed or implied in the predictive statements. Therefore, such information is provided for reference purpose only and constitutes neither an offer nor an acceptance. Huawei may change the information at any time without notice.