This document discusses diagnosing LTE traffic faults through drive testing. It provides probes and indicators for issues related to insufficient resources for scheduling, coding with low values, poor coverage, abnormal receive power, and other potential problems. Diagnosis involves checking for operations and external events that could affect service rates. Specific alarms and their impacts are also listed. The document is marked as confidential information that requires permission before spreading.
This document provides a troubleshooting guide for LTE inter-radio access technology (IRAT) handovers. It describes why IRAT is needed as voice revenues remain important while data revenues grow. It also outlines the applications of IRAT, delivery policies for idle mode, connected mode, and voice services. Signaling procedures for IRAT handovers including reselection, redirection, and PS handover are defined. Key performance indicators for IRAT including control plane delays and user plane interruption times are also defined to help diagnose IRAT issues.
The document discusses fault analysis and troubleshooting of LTE antenna and feeder systems. It describes techniques like RSSI analysis, frequency scanning, interference detection tests, and DTP testing to identify issues like passive intermodulation (PIM) and determine if the fault is in the antenna tower or below. Parameters for simulated load testing and online interference monitoring are also outlined.
The document discusses VoLTE optimization services including RAN and EPC analysis using various tools. It details accomplishments like optimizing sites for carriers and analyzing problems like VoLTE drop issues. The key services described are VoLTE parameter audits, drive log analysis, UETR analysis, and end-to-end VoLTE call tracing. Case studies provided examine issues like QCI profile not defined, RRC drops without VoLTE drops, and improvements gained from features like ICIC and parameter changes.
The document discusses LTE system signaling procedures. It begins with objectives of understanding LTE architecture, elementary procedures of interfaces like S1, X2 and Uu, and procedures for service setup, release and handover. It then covers topics like system architecture, bearer service architecture, elementary procedures on Uu including connection establishment and release, and procedures on S1 and X2 interfaces. The document aims to help readers understand LTE signaling flows and procedures.
Inter-frequency and inter-RAT handovers can be coverage, load, or service based. Coverage-based handovers are triggered by certain A3/A4/A5 events for inter-frequency and B1/B2 events for inter-RAT. The document discusses the parameters involved in measuring cells and configuring handovers, including measurement reports, handover commands, and key performance indicators for analyzing handover issues. Common causes of handover problems include poor downlink quality, interference, and abnormal X2 interface signaling.
1. The document provides Huawei's mobility strategy recommendations for Maxis' LTE network, which involves LTE, UMTS, and GSM networks.
2. The strategy addresses cell selection and reselection procedures in both idle and connected modes between the different RATs and frequencies. It aims to optimize coverage and load balancing through configuration of various priority and threshold parameters.
3. Over multiple revisions from 2012 to 2018, the strategy has been updated based on trials and discussions between Maxis and Huawei to refine the parameter settings and push more users to preferred frequencies like L2600.
The document discusses various LTE measurement parameters and procedures including:
1. The eNB reports a list of detected PRACH preambles and measures timing advance, average RSSI, average SINR, UL CSI, and transport BLER for RRM purposes.
2. UE measurements include CQI, RSRP, and RSRQ while eNB measurements include timing advance, RSSI, SINR, UL CSI, detected preambles, and transport BLER. Inter-RAT measurements are also discussed.
3. Examples of RSRP, RSRQ, and timing advance procedures are provided along with CQI measurement details. PLMN selection, cell selection,
LTE uses various frequency bands and duplexing techniques to provide high-speed data and peak download speeds of up to 300 Mbps. It supports mobility of up to 350 km/h and uses advanced technologies like OFDM, SC-FDMA, MIMO and turbo coding to achieve low latency and high bandwidth. LTE specifications define channel bandwidths of 1.4, 3, 5, 10, 15 and 20 MHz with modulation schemes of QPSK, 16QAM and 64QAM.
This document provides a troubleshooting guide for LTE inter-radio access technology (IRAT) handovers. It describes why IRAT is needed as voice revenues remain important while data revenues grow. It also outlines the applications of IRAT, delivery policies for idle mode, connected mode, and voice services. Signaling procedures for IRAT handovers including reselection, redirection, and PS handover are defined. Key performance indicators for IRAT including control plane delays and user plane interruption times are also defined to help diagnose IRAT issues.
The document discusses fault analysis and troubleshooting of LTE antenna and feeder systems. It describes techniques like RSSI analysis, frequency scanning, interference detection tests, and DTP testing to identify issues like passive intermodulation (PIM) and determine if the fault is in the antenna tower or below. Parameters for simulated load testing and online interference monitoring are also outlined.
The document discusses VoLTE optimization services including RAN and EPC analysis using various tools. It details accomplishments like optimizing sites for carriers and analyzing problems like VoLTE drop issues. The key services described are VoLTE parameter audits, drive log analysis, UETR analysis, and end-to-end VoLTE call tracing. Case studies provided examine issues like QCI profile not defined, RRC drops without VoLTE drops, and improvements gained from features like ICIC and parameter changes.
The document discusses LTE system signaling procedures. It begins with objectives of understanding LTE architecture, elementary procedures of interfaces like S1, X2 and Uu, and procedures for service setup, release and handover. It then covers topics like system architecture, bearer service architecture, elementary procedures on Uu including connection establishment and release, and procedures on S1 and X2 interfaces. The document aims to help readers understand LTE signaling flows and procedures.
Inter-frequency and inter-RAT handovers can be coverage, load, or service based. Coverage-based handovers are triggered by certain A3/A4/A5 events for inter-frequency and B1/B2 events for inter-RAT. The document discusses the parameters involved in measuring cells and configuring handovers, including measurement reports, handover commands, and key performance indicators for analyzing handover issues. Common causes of handover problems include poor downlink quality, interference, and abnormal X2 interface signaling.
1. The document provides Huawei's mobility strategy recommendations for Maxis' LTE network, which involves LTE, UMTS, and GSM networks.
2. The strategy addresses cell selection and reselection procedures in both idle and connected modes between the different RATs and frequencies. It aims to optimize coverage and load balancing through configuration of various priority and threshold parameters.
3. Over multiple revisions from 2012 to 2018, the strategy has been updated based on trials and discussions between Maxis and Huawei to refine the parameter settings and push more users to preferred frequencies like L2600.
The document discusses various LTE measurement parameters and procedures including:
1. The eNB reports a list of detected PRACH preambles and measures timing advance, average RSSI, average SINR, UL CSI, and transport BLER for RRM purposes.
2. UE measurements include CQI, RSRP, and RSRQ while eNB measurements include timing advance, RSSI, SINR, UL CSI, detected preambles, and transport BLER. Inter-RAT measurements are also discussed.
3. Examples of RSRP, RSRQ, and timing advance procedures are provided along with CQI measurement details. PLMN selection, cell selection,
LTE uses various frequency bands and duplexing techniques to provide high-speed data and peak download speeds of up to 300 Mbps. It supports mobility of up to 350 km/h and uses advanced technologies like OFDM, SC-FDMA, MIMO and turbo coding to achieve low latency and high bandwidth. LTE specifications define channel bandwidths of 1.4, 3, 5, 10, 15 and 20 MHz with modulation schemes of QPSK, 16QAM and 64QAM.
The document describes LTE access procedures including random access, RRC connection setup, E-RAB setup, and TAU procedures. It provides details on random access preamble formats, RA response transmission, contention resolution, and relevant performance counters for monitoring each step of the LTE access process. Troubleshooting tips are also given for common issues like NAS procedure failures, ERAB setup failures, and RRC connection rejections.
LTE Location Management and Mobility Managementaliirfan04
Provides an overview of power management (connected and idle mode) and mobility management (both idle-mode mobility (cell selection and re-selection) and active mode (handovers).
The document discusses drive testing using TEMS Investigation software. It provides an overview of the tools needed for drive testing including a laptop, dongle, mobile set, modem, GPS, and more. It outlines the steps to setup the software and ensure all tools are connected and functioning properly. These include attaching the required devices, loading cell files, and selecting the log collection location. The document also describes some key parameters that can be analyzed during drive testing like signal strength, interference, and throughput.
This document discusses LTE network coverage optimization. It identifies six main causes of coverage problems: incorrect network planning, deviations from planned site positions, differences between actual and planned parameters, changes to the wireless environment, new coverage requirements, and increased network load. The document notes that coverage optimization aims to eliminate downlink coverage issues like holes, weakness, overshooting, and lack of a dominant cell, as well as optimize uplink coverage, balance uplink/downlink coverage, reduce interference, and improve handovers. Common optimization methods include antenna, feeder and parameter adjustments.
This document provides an overview and detailed descriptions of Circuit Switched Fallback (CSFB) features in an evolved Radio Access Network (eRAN). It describes CSFB procedures for falling back from an LTE network to UTRAN or GERAN networks to support circuit switched services like voice calls. The document includes sections on CSFB architectures, handover decisions and executions, related interfaces, engineering guidelines, parameters and troubleshooting.
The document discusses LTE network architecture including nodes like the eNodeB, MME, SGW and PGW, and their functions. It also outlines the basic LTE call flows for initial call setup, detach procedures, idle-to-active transitions, and handovers. Key call flow steps include attach request, authentication, context setup, and establishment of bearers between the UE and PDN gateway.
2-How to Extend DTAC LTE Coverage with Limited RRU Capacity.pdfibrahim jerbi
This document discusses how to extend LTE coverage with limited RRU capacity at DTAC's live network. It provides information on LTE technology power consumption, the LTE formula for cell reference signal (CRS) gain using power boosting (PB), demo predictions of CRS gain using an asset planning tool, calculations of coverage area and population comparisons based on CRS gain, configuration of CRS gain in three vendors' equipment, and recommendations for PB and PA values in DTAC's live LTE network.
This document provides an agenda and procedures for conducting cluster optimization tests. It describes drive routes that cover all sectors of each base station in the cluster. Key tests include FTP uplink/downlink calls, VoLTE calls, and checks of coverage, mobility, accessibility and voice quality. The objectives are to validate RF design, handover performance, retainability, and identify worst areas for improvement through two drive tests and analysis of call logs and KPIs. Attendees should be RF and drive test engineers familiar with the XCAL tool and SCFT procedures.
This document provides information about MobileComm Technologies' drive test process for UMTS networks. It includes documentation on tools used for tuning and optimization, parameters measured, call flows, key performance indicators, examples of coverage and interference issues identified, and tips for network tuning. The document contains 47 slides covering topics like coverage verification using P-CPICH measurements, identifying interference and overshooting issues, analyzing call drops, tuning for voice and data calls, and comparing mechanical vs electrical antenna tilts.
This document provides suggestions to help operators reduce call setup time (CST) in benchmark tests. It describes enhancements that can be made to WCDMA RAN, LTE RAN, EPC, IMS, MSS and UDM networks. For each enhancement, it discusses the impacted domains, pros, cons, dependencies and references. The primary focus is on improving CST without compromising network performance. Local teams should evaluate which enhancements fit their specific network conditions and priorities.
This document provides an overview of the LTE physical channel structure and procedures between the eNB and UE. It describes the LTE architecture and introduces the main physical channels including downlink channels like PBCH, PDCCH, PDSCH and uplink channels like PUSCH, PUCCH, PRACH. It explains the channel mapping and provides examples of the initial access procedure and synchronization signal transmission. Key concepts covered are radio interface protocol stacks, channel coding, multiple access, and reference signals.
3G drive test procedure (SSV) by Md Joynal AbadenMd Joynal Abaden
This document outlines the procedure for performing a 3G SSV (Site Survey Verification) drive test. It describes the objectives of verifying RF design and identifying coverage/quality issues. It lists the necessary drive test tools including laptops, phones, dongles, GPS, and software. It describes performing individual cell verification tests to check performance metrics like RSCP, Ec/No, and HSPA speed on a per-cell basis in static and drive tests. The procedure involves verifying metrics, calls, and data service on each cell sector and checking handovers between cells. The goal is to accept the site once planned coverage and performance are achieved.
This document summarizes various LTE KPIs and performance metrics related to random access, RRC connection establishment, ERAB establishment, and issues that may impact them. It provides potential causes for high values or failures in these metrics as well as recommended actions to investigate like checking RF parameters, capacity, licenses, alarms, configuration, and optimizing physical antenna settings.
This document provides guidelines for LTE radio frequency (RF) network optimization. It describes the network optimization process including single site verification and RF optimization. Key aspects of RF optimization covered include preparing for optimization by collecting data, analyzing problems related to coverage, signal quality and handover success rate, and adjusting parameters like transmit power, antenna tilts and neighboring cell configurations. Common issues addressed are weak coverage, coverage holes, lack of a dominant cell, and cross coverage between cells. Optimization methods and specific cases are presented to resolve different problems.
Oea000000 lte principle fundamental issue 1.01Ndukwe Amandi
This document provides an overview of LTE systems and technologies. It describes LTE's development through 3GPP releases, its network architecture as an all-IP flat network, and its key air interface technologies including OFDMA, SC-FDMA, MIMO, and adaptive modulation and coding. The document also outlines LTE's protocol stacks, channels, and deployment considerations for a smooth evolution from 2G/3G networks to 4G LTE.
The document discusses LTE uplink power control. It describes that uplink power control uses both open-loop and closed-loop mechanisms. Open-loop power control estimates path loss to set the initial transmission power, while closed-loop allows the network to directly control transmission power through power control commands. Power control helps reduce interference, maximize data rates, and prolong UE battery life by adjusting transmission power on a subframe basis.
This document describes the design of an LTE network optimization project by a group of students from Taiz University. It includes an introduction to LTE, the network planning process, and LTE system architecture. The network planning section discusses coverage planning including link budget calculations and propagation models, as well as capacity planning considering factors like interference levels and supported modulation schemes. The document also provides an overview of LTE system architecture components including the user equipment, E-UTRAN, EPC, and functions of each. It concludes with a section on LTE radio frequency optimization methods.
This document provides an overview of LTE functionalities and features. It begins with background on LTE development and standardization. It then describes the LTE network elements and interfaces, including the radio interface between UE and eNB. The document reviews the RRM framework and lists key RRM features, providing status updates on which features are ready in the current release or planned for future releases. It also includes roadmaps showing the planned features and timeline for LTE releases. The document appears to be an internal presentation on LTE technologies and the Nokia Siemens Networks product roadmap.
This document provides technical training on optimizing LTE downlink throughput. It discusses:
1. The increasing commercial adoption of LTE networks and rapid growth of LTE users.
2. Challenges in optimizing LTE networks including insufficient analysis capabilities and experience-based adjustments.
3. A proposed optimization scheme involving in-depth analysis of issues like weak coverage, interference and throughput problems to identify root causes and targeted optimization suggestions.
The document discusses optimization of Voice over LTE (VoLTE) networks, including planning, implementation, key performance indicators (KPIs), challenges, and testing tools. It provides an introduction to VoLTE and describes the phases of VoLTE deployment. Metrics for analyzing VoLTE performance from terminal logs, traces collected at the Mobility Management Entity (MME), and Wireshark logs are outlined. Finally, flow charts are presented for optimizing VoLTE accessibility, retainability, and mobility based on drive test and operations support system (OSS) statistics analysis.
The document provides an overview of LTE architecture, interfaces, network elements, radio network and protocols. It describes the main LTE interfaces like Uu, S1, X2 and S5. The network elements discussed are eNB, MME, SGW and PGW. The radio network section covers physical layer technologies used in LTE like OFDMA, MIMO and QAM. It also explains transport channels, logical channels and layer 2 architecture in LTE.
The document describes LTE access procedures including random access, RRC connection setup, E-RAB setup, and TAU procedures. It provides details on random access preamble formats, RA response transmission, contention resolution, and relevant performance counters for monitoring each step of the LTE access process. Troubleshooting tips are also given for common issues like NAS procedure failures, ERAB setup failures, and RRC connection rejections.
LTE Location Management and Mobility Managementaliirfan04
Provides an overview of power management (connected and idle mode) and mobility management (both idle-mode mobility (cell selection and re-selection) and active mode (handovers).
The document discusses drive testing using TEMS Investigation software. It provides an overview of the tools needed for drive testing including a laptop, dongle, mobile set, modem, GPS, and more. It outlines the steps to setup the software and ensure all tools are connected and functioning properly. These include attaching the required devices, loading cell files, and selecting the log collection location. The document also describes some key parameters that can be analyzed during drive testing like signal strength, interference, and throughput.
This document discusses LTE network coverage optimization. It identifies six main causes of coverage problems: incorrect network planning, deviations from planned site positions, differences between actual and planned parameters, changes to the wireless environment, new coverage requirements, and increased network load. The document notes that coverage optimization aims to eliminate downlink coverage issues like holes, weakness, overshooting, and lack of a dominant cell, as well as optimize uplink coverage, balance uplink/downlink coverage, reduce interference, and improve handovers. Common optimization methods include antenna, feeder and parameter adjustments.
This document provides an overview and detailed descriptions of Circuit Switched Fallback (CSFB) features in an evolved Radio Access Network (eRAN). It describes CSFB procedures for falling back from an LTE network to UTRAN or GERAN networks to support circuit switched services like voice calls. The document includes sections on CSFB architectures, handover decisions and executions, related interfaces, engineering guidelines, parameters and troubleshooting.
The document discusses LTE network architecture including nodes like the eNodeB, MME, SGW and PGW, and their functions. It also outlines the basic LTE call flows for initial call setup, detach procedures, idle-to-active transitions, and handovers. Key call flow steps include attach request, authentication, context setup, and establishment of bearers between the UE and PDN gateway.
2-How to Extend DTAC LTE Coverage with Limited RRU Capacity.pdfibrahim jerbi
This document discusses how to extend LTE coverage with limited RRU capacity at DTAC's live network. It provides information on LTE technology power consumption, the LTE formula for cell reference signal (CRS) gain using power boosting (PB), demo predictions of CRS gain using an asset planning tool, calculations of coverage area and population comparisons based on CRS gain, configuration of CRS gain in three vendors' equipment, and recommendations for PB and PA values in DTAC's live LTE network.
This document provides an agenda and procedures for conducting cluster optimization tests. It describes drive routes that cover all sectors of each base station in the cluster. Key tests include FTP uplink/downlink calls, VoLTE calls, and checks of coverage, mobility, accessibility and voice quality. The objectives are to validate RF design, handover performance, retainability, and identify worst areas for improvement through two drive tests and analysis of call logs and KPIs. Attendees should be RF and drive test engineers familiar with the XCAL tool and SCFT procedures.
This document provides information about MobileComm Technologies' drive test process for UMTS networks. It includes documentation on tools used for tuning and optimization, parameters measured, call flows, key performance indicators, examples of coverage and interference issues identified, and tips for network tuning. The document contains 47 slides covering topics like coverage verification using P-CPICH measurements, identifying interference and overshooting issues, analyzing call drops, tuning for voice and data calls, and comparing mechanical vs electrical antenna tilts.
This document provides suggestions to help operators reduce call setup time (CST) in benchmark tests. It describes enhancements that can be made to WCDMA RAN, LTE RAN, EPC, IMS, MSS and UDM networks. For each enhancement, it discusses the impacted domains, pros, cons, dependencies and references. The primary focus is on improving CST without compromising network performance. Local teams should evaluate which enhancements fit their specific network conditions and priorities.
This document provides an overview of the LTE physical channel structure and procedures between the eNB and UE. It describes the LTE architecture and introduces the main physical channels including downlink channels like PBCH, PDCCH, PDSCH and uplink channels like PUSCH, PUCCH, PRACH. It explains the channel mapping and provides examples of the initial access procedure and synchronization signal transmission. Key concepts covered are radio interface protocol stacks, channel coding, multiple access, and reference signals.
3G drive test procedure (SSV) by Md Joynal AbadenMd Joynal Abaden
This document outlines the procedure for performing a 3G SSV (Site Survey Verification) drive test. It describes the objectives of verifying RF design and identifying coverage/quality issues. It lists the necessary drive test tools including laptops, phones, dongles, GPS, and software. It describes performing individual cell verification tests to check performance metrics like RSCP, Ec/No, and HSPA speed on a per-cell basis in static and drive tests. The procedure involves verifying metrics, calls, and data service on each cell sector and checking handovers between cells. The goal is to accept the site once planned coverage and performance are achieved.
This document summarizes various LTE KPIs and performance metrics related to random access, RRC connection establishment, ERAB establishment, and issues that may impact them. It provides potential causes for high values or failures in these metrics as well as recommended actions to investigate like checking RF parameters, capacity, licenses, alarms, configuration, and optimizing physical antenna settings.
This document provides guidelines for LTE radio frequency (RF) network optimization. It describes the network optimization process including single site verification and RF optimization. Key aspects of RF optimization covered include preparing for optimization by collecting data, analyzing problems related to coverage, signal quality and handover success rate, and adjusting parameters like transmit power, antenna tilts and neighboring cell configurations. Common issues addressed are weak coverage, coverage holes, lack of a dominant cell, and cross coverage between cells. Optimization methods and specific cases are presented to resolve different problems.
Oea000000 lte principle fundamental issue 1.01Ndukwe Amandi
This document provides an overview of LTE systems and technologies. It describes LTE's development through 3GPP releases, its network architecture as an all-IP flat network, and its key air interface technologies including OFDMA, SC-FDMA, MIMO, and adaptive modulation and coding. The document also outlines LTE's protocol stacks, channels, and deployment considerations for a smooth evolution from 2G/3G networks to 4G LTE.
The document discusses LTE uplink power control. It describes that uplink power control uses both open-loop and closed-loop mechanisms. Open-loop power control estimates path loss to set the initial transmission power, while closed-loop allows the network to directly control transmission power through power control commands. Power control helps reduce interference, maximize data rates, and prolong UE battery life by adjusting transmission power on a subframe basis.
This document describes the design of an LTE network optimization project by a group of students from Taiz University. It includes an introduction to LTE, the network planning process, and LTE system architecture. The network planning section discusses coverage planning including link budget calculations and propagation models, as well as capacity planning considering factors like interference levels and supported modulation schemes. The document also provides an overview of LTE system architecture components including the user equipment, E-UTRAN, EPC, and functions of each. It concludes with a section on LTE radio frequency optimization methods.
This document provides an overview of LTE functionalities and features. It begins with background on LTE development and standardization. It then describes the LTE network elements and interfaces, including the radio interface between UE and eNB. The document reviews the RRM framework and lists key RRM features, providing status updates on which features are ready in the current release or planned for future releases. It also includes roadmaps showing the planned features and timeline for LTE releases. The document appears to be an internal presentation on LTE technologies and the Nokia Siemens Networks product roadmap.
This document provides technical training on optimizing LTE downlink throughput. It discusses:
1. The increasing commercial adoption of LTE networks and rapid growth of LTE users.
2. Challenges in optimizing LTE networks including insufficient analysis capabilities and experience-based adjustments.
3. A proposed optimization scheme involving in-depth analysis of issues like weak coverage, interference and throughput problems to identify root causes and targeted optimization suggestions.
The document discusses optimization of Voice over LTE (VoLTE) networks, including planning, implementation, key performance indicators (KPIs), challenges, and testing tools. It provides an introduction to VoLTE and describes the phases of VoLTE deployment. Metrics for analyzing VoLTE performance from terminal logs, traces collected at the Mobility Management Entity (MME), and Wireshark logs are outlined. Finally, flow charts are presented for optimizing VoLTE accessibility, retainability, and mobility based on drive test and operations support system (OSS) statistics analysis.
The document provides an overview of LTE architecture, interfaces, network elements, radio network and protocols. It describes the main LTE interfaces like Uu, S1, X2 and S5. The network elements discussed are eNB, MME, SGW and PGW. The radio network section covers physical layer technologies used in LTE like OFDMA, MIMO and QAM. It also explains transport channels, logical channels and layer 2 architecture in LTE.
4 lte access transport network dimensioning issue 1.02saeed_sh65
The document discusses several key aspects of an LTE access transport network:
1. It describes the five major interfaces of an eNodeB including S1, X2, OM, clock, and co-transmission interfaces.
2. It explains the protocols used on the S1 and X2 interfaces including SCTP, GTP-U, and X2AP.
3. It provides an overview of the different layers - layers 1, 2, and 3 - that can be used as transport bearer networks for an LTE system and their characteristics.
The document provides information on drive testing in GSM networks. Drive testing involves using mobile devices to collect network performance data along predetermined routes. This helps evaluate coverage, availability, capacity, retainability, and call quality from the subscriber perspective. Key aspects discussed include the hardware requirements for drive testing (laptop, data collection software, mobile phones, GPS), different test modes (dedicated call, idle, scan), and important metrics to analyze (Rx level, Rx quality, bit error rate, frame erasure rate, speech quality index). TEMS software is highlighted as a common tool for collecting data and analyzing network performance based on drive test results.
The document discusses various resources in an LTE network that need to be monitored to ensure capacity and quality of service. It describes several key performance indicators (KPIs) related to resources like connected users, traffic volume, paging messages, processor usage, and provides thresholds and solutions to address issues.
The document discusses and compares the performance of different network topologies in OPNET:
- A hub-only topology showed the highest delay and packet loss due to collisions from broadcasting.
- Adding a switch improved performance by reducing delay and increasing packets received through switching instead of broadcasting.
- A switch-only or dual switch topology had the best performance with no collisions and lowest delay, as switches use addressing tables to directly send packets without broadcasting.
The document discusses and compares the performance of different network topologies in OPNET:
- A hub-only topology showed the highest delay and packet loss due to collisions from broadcasting.
- Adding a switch improved performance by reducing delay and increasing packets received through switching instead of broadcasting.
- A switch-only or dual switch topology had the best performance with no collisions and lowest delay, as switches use addressing tables to directly send packets without broadcasting.
Improving Performance of TCP in Wireless Environment using TCP-PIDES Editor
Improving the performance of the transmission
control protocol (TCP) in wireless environment has been an
active research area. Main reason behind performance
degradation of TCP is not having ability to detect actual reason
of packet losses in wireless environment. In this paper, we are
providing a simulation results for TCP-P (TCP-Performance).
TCP-P is intelligent protocol in wireless environment which
is able to distinguish actual reasons for packet losses and
applies an appropriate solution to packet loss.
TCP-P deals with main three issues, Congestion in
network, Disconnection in network and random packet losses.
TCP-P consists of Congestion avoidance algorithm and
Disconnection detection algorithm with some changes in TCP
header part. If congestion is occurring in network then
congestion avoidance algorithm is applied. In congestion
avoidance algorithm, TCP-P calculates number of sending
packets and receiving acknowledgements and accordingly set
a sending buffer value, so that it can prevent system from
happening congestion. In disconnection detection algorithm,
TCP-P senses medium continuously to detect a happening
disconnection in network. TCP-P modifies header of TCP
packet so that loss packet can itself notify sender that it is
lost.This paper describes the design of TCP-P, and presents
results from experiments using the NS-2 network simulator.
Results from simulations show that TCP-P is 4% more
efficient than TCP-Tahoe, 5% more efficient than TCP-Vegas,
7% more efficient than TCP-Sack and equally efficient in
performance as of TCP-Reno and TCP-New Reno. But we can
say TCP-P is more efficient than TCP-Reno and TCP-New
Reno since it is able to solve more issues of TCP in wireless
environment.
A Survey of Different Approaches for Differentiating Bit Error and Congestion...IJERD Editor
TCP provides reliable wireless communication. The packet loss occurs in wireless network during
the data transmission and these losses are always classified as congestion losses. While Packet is also lost due to
random bit error. But traditional TCP always consider as packet is lost due to congestion and reduce it
congestion window. Thus, TCP gives poor performance in wireless link. Many TCP variants have been
proposed for congestion control but they cannot distinguish error either due to congestion or due to bit error thus
it reduces congestion window every time but when there is a bit error then no need to reduce the transmission
rate. In this survey the general approaches taken for differentiating congestion or bit error has been discussed.
This document provides guidelines for LTE radio frequency (RF) network optimization. It describes the network optimization process, including single site verification and RF optimization. RF optimization objectives like coverage, signal quality and handover success rate are defined. Methods for adjusting azimuth, tilt, power and other parameters to improve coverage and resolve issues are presented. The roles of RSRP, SINR and other metrics in optimization are also explained. The document aims to aid network planning and optimization personnel in evaluating and improving LTE network performance.
This document provides guidelines for LTE radio frequency (RF) network optimization. It describes the network optimization process, including single site verification and RF optimization. RF optimization objectives like coverage, signal quality and handover success rate are defined. Methods for adjusting azimuth, tilt, power and other parameters to improve coverage and resolve issues are presented. The roles of RSRP, SINR and other metrics in optimization are also explained. The document aims to aid network planning and optimization personnel in evaluating and improving LTE network performance.
Carrier aggregation allows LTE networks to aggregate multiple component carriers to increase bandwidth and peak data rates. It is a key technology in LTE-Advanced. Three carrier aggregation was standardized in Release 10 and improvements were made in Releases 11 and 12. Implementing carrier aggregation poses design challenges for user equipment due to requirements for complex transceiver architectures capable of simultaneously transmitting and receiving on multiple frequency bands, which can cause issues like intermodulation distortion. It also impacts higher layers with changes to RRC signaling and the addition of cross-carrier scheduling capabilities. Thorough testing is needed to validate performance under realistic radio frequency impairment conditions.
This document provides guidelines for LTE radio frequency (RF) network optimization. It describes the network optimization process including single site verification and RF optimization. Key aspects of RF optimization covered include preparing by collecting data and analyzing problems, adjusting parameters such as transmit power and neighbor lists, and ensuring optimization objectives like coverage, signal quality, and handover success rates are met. The document also details common issues like weak coverage, lack of a dominant cell, and cross coverage and methods for resolving them.
This document provides guidelines for LTE radio frequency (RF) network optimization. It describes the network optimization process including single site verification and RF optimization. Key optimization objects are defined such as reference signal received power (RSRP), signal to interference plus noise ratio (SINR), and handover success rate. Common coverage issues like weak coverage, coverage holes, lack of a dominant cell, and cross coverage are explained along with methods to resolve them. The document also outlines RF optimization preparations, methods, and troubleshooting techniques.
LTE network planning involves coverage and capacity planning. Key aspects of LTE network planning include link budget and capacity estimation. Radio network planning solutions help with interference avoidance, co-antenna analysis, and other performance enhancement features. LTE has a flat network architecture with OFDM technology and MIMO. Network elements include eNodeBs and elements in the EPC such as MME, S-GW, and P-GW.
This document provides guidelines for LTE radio frequency (RF) network optimization. It describes the network optimization process including single site verification and RF optimization. The key objectives of RF optimization are improving coverage, signal quality, and handover success rate. Guidelines are provided for analyzing problems related to weak coverage, lack of a dominant cell, cross coverage, and methods for resolving them. The document also defines LTE RF optimization metrics like RSRP, SINR and handover success rate and provides target baselines.
The document discusses LTE handover fault diagnosis. It describes typical handover flows, measurement control processes, handover request messages, KPIs for measuring handover success rates, and various fault scenarios and solutions. Common faults include poor coverage causing signaling failures, incorrect neighbor cell configurations, and transmission issues on the X2 or S1 interfaces. Diagnosis involves analyzing call traces, RSRP/RSRQ measurements and troubleshooting potential causes like RF adjustments, parameter optimizations or transmission resource limitations.
The document discusses various parameters used in LTE drive testing including:
- RSRP, RSRQ, SINR, RSSI, CQI, PCI, BLER, and throughput which provide information on signal strength, quality, and performance. Phone-based drive testing allows monitoring of these parameters and correlation with data performance. MIMO and handovers between LTE and other technologies can also be evaluated. Key metrics include coverage, capacity, and end-user experience.
The document discusses drive testing using TEMS Investigation software. It provides an overview of the tools needed for drive testing including a laptop, dongle, mobile set, modem, GPS, and more. It outlines the steps to setup the software and ensure all tools are connected and functioning properly. These include attaching the required devices, loading cell files, and selecting the log collection location. The document also describes some key parameters that can be analyzed during drive testing like signal strength, interference, and throughput.
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4.oeo000040 lte traffic fault diagnosis issue 1
1. LTE Traffic Fault Diagnosis (Drive Test)
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2. LTE Traffic Fault Diagnosis (Drive Test)
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3. LTE Traffic Fault Diagnosis (Drive Test)
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4. LTE Traffic Fault Diagnosis (Drive Test)
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5. LTE Traffic Fault Diagnosis (Drive Test)
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6. LTE Traffic Fault Diagnosis (Drive Test)
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7. LTE Traffic Fault Diagnosis (Drive Test)
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8. LTE Traffic Fault Diagnosis (Drive Test)
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9. Insufficient resources for scheduling(RB Number&Grant)
LTE Traffic Fault Diagnosis (Drive Test)
[Probe] The number downlink/uplink Grant times is less than 0.9 multiplying the
theoretical value.
[Probe] The number of PDSCH RBs is less than the theoretical RB value for the total
system bandwidth multiplying 0.9.
Coding with low values (MCS, IBLER, and Rank)
[Probe] The downlink or uplink IBLER is greater than 12%.
[U2000] For interference detection monitoring in cell performance monitoring,
there is an interference value of an RB greater than –120 dBm (eRAN3.0) or –110
dBm (eRAN6.0).
The Rank2 ratio is less than 80%.
Poor coverage
[Probe] Downlink: The SINR is lower than 25 dB (in the peak rate test scenario), or
the RSRP difference between the local cell and a neighboring cell is lower than 10
dBm.
[Probe] Uplink: During the uplink test, the path loss is lower than 100, the PUSCH
power is greater than 20 dBm, the IBLER converges to 10%, and the MCS is low
(the MCS should be greater than 23 according to the peak rate requirement).
Abnormal receive power
[Probe] The average difference between RSRPs of two antennas in the downlink is
greater than 3 dB.
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10. LTE Traffic Fault Diagnosis (Drive Test)
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11. Based on problem scenarios, use different methods to check for operations and external
LTE Traffic Fault Diagnosis (Drive Test)
events that affect the service rate.
For performance deterioration problems, perform this step first to determine the
correlation between the external events/historical operations and the deterioration events
in terms of time/scope.
For multiple faulty eNodeBs, focus on operations that affect network performance, such as
EPC or transmission operations. For eNodeB-level operations, select top 10 cells for analysis
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12. The Hardware Module is faulty:
LTE Traffic Fault Diagnosis (Drive Test)
ALM-26532 RF Unit Hardware Fault
ALM-26538 RF Unit Clock Problem
ALM-26506 RF Unit Optical Interface Performance Degraded
The coverage shrinks, therefore the service rate is affected:
ALM-26520 RF Unit TX Channel Gain Out of Range
Handover failure may happen and the service rate is affected:
ALM-29204 X2 Interface Fault
Uplink demodulation performance may be affected:
ALM-26521 RF Unit RX Channel RTWP/RSSI Too Low
Uplink coverage shrinks:
ALM-26522 RF Unit RX Channel RTWP/RSSI Unbalanced
ALM-26787 RHUB-pRRU CPRI Interface Error
ALM-26758 TMA Running Data and Configuration Mismatch
ALM-26755 TMA Bypass
ALM-26530 RF Unit ALD Current Out of Range
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13. Influence by PDCCH Symbol Number
LTE Traffic Fault Diagnosis (Drive Test)
Downlink data transmission throughput strongly associated with the number of
PDCCH symbols. The default is the symbol 3 PDCCH adaptive. When peak test, we
can manually set the initial number of symbols of PDCCH to be 1.
Influence by fast ANR
eNodeB will be automatically selected at random to support fast ANR UE. UE will
continue to report neighborhood information to the eNodeB, which would affect
the UE uplink throughput. If the fast ANR is enabled, the rate of the selected UE
will be decreased by 1/4.
Influence by Frequency Selective Scheduling
If this scheduling is enabled, the Ues can only part of the frequency instead of all
frequency. Therefore the throughput will be affected.
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14. LTE Traffic Fault Diagnosis (Drive Test)
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15. -l 1400: Indicates the injected packet length. The default value is 1498 bytes (measured at the IP
layer, including the IP header). This parameter must be set at both the sender and receiver.
LTE Traffic Fault Diagnosis (Drive Test)
layer, including the IP header). This parameter must be set at both the sender and receiver.
-p 5010: Indicates the injecting port. The default value is 5001. This parameter must be set at both
the sender and receiver. Note that this parameter at the sender indicates the injecting port and the
one at the receiver indicates the receiving port.
-P 2: Indicates two injecting threads. Assuming that the injecting rate is 1 Mbit/s (indicated by -b 1m),
the injecting rate becomes 2 Mbit/s if two threads are used to inject packets. This parameter is set on
the sender only.
Injecting TCP packets
To set up a receiving service in the receiver, run the iperf –s –i 1 –w 512k command,
Where –s indicates receiving service, –i 1 indicates that the received traffic volume is
displayed once per second, and –w 512k indicates that the receive window of the receiver
is 512 KB. This command lacks the –u option in comparison with the command executed
for UDP at the receiver.
Run the iperf –c x. x. x. x –t 1000 –i 1 –w 512k command,
where –c x. x. x. x indicates the IP address that the sender is connected to, -t 1000 indicates
inject duration of 1000 seconds, -i 1 indicates that the injected traffic volume is displayed
once per second, and -w 512k indicates that the receive window of the sender is 512 KB.
Other parameters are explained as follows:
-M 1400: Indicates the maximum segment size (MSS) of TCP packets, excluding the IP
header and TCP header. The default value is 1460 bytes. This parameter must be set at both
the sender and receiver.
-p 5010: Indicates the injecting port. The default value is 5001. This parameter must be set
at both the sender and receiver. Note that this parameter at the sender indicates the
injecting port and the one at the receiver indicates the receiving port.
-P 2: Indicates two threads for injecting or receiving packets. This parameter is set on the
sender only.
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16. LTE Traffic Fault Diagnosis (Drive Test)
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17. LTE Traffic Fault Diagnosis (Drive Test)
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18. LTE Traffic Fault Diagnosis (Drive Test)
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19. If no route is configured, run the following command to configure the return route:
LTE Traffic Fault Diagnosis (Drive Test)
route add [service IP address of the UE] mask [subnet mask] [service IP address of
the server] –p
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20. If the aggregate maximum bit rate (AMBR) is set to 0, the UE can access the network but
LTE Traffic Fault Diagnosis (Drive Test)
fails in data transmission. In this case, check the AMBR value in the access message.
View the AMBR in the S1AP_INITIAL_CONTEXT_SETUP_REQ message traced over the S1
interface. If the AMBR value is 0, contact evolved packet core (EPC) personnel to modify
the AMBR.
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21. The ROHC feature provides an efficient header compression mechanism for RTP, UDP, and
LTE Traffic Fault Diagnosis (Drive Test)
IP packets to improve transmission efficiency and transmission quality and features high
compression ratio and robustness. In ROCH mode, data can be successfully transmitted
only when the ROCH feature is supported on the transmit and receive sides. Currently, only
four ROHC formats are supported by Huawei eNodeBs. Run the following command to
check whether the ROHC is enabled.
If a commercial UE does not support the ROHC and the ROCH is enabled on the eNodeB,
data transmission will fail. In this case, run the following command to disable the ROHC on
the eNodeB.
MOD PDCPROHCPARA:ROHCSWITCH=OFF;
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22. LTE Traffic Fault Diagnosis (Drive Test)
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23. LTE Traffic Fault Diagnosis (Drive Test)
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24. LTE Traffic Fault Diagnosis (Drive Test)
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25. LTE Traffic Fault Diagnosis (Drive Test)
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26. Figure shows injection of a 130 MB packet on the downlink and the ingress traffic on the
LTE Traffic Fault Diagnosis (Drive Test)
eNodeB is 131. 28 Mbit/s (16410349 x 8/1000/1000). The calculation result shows that
the traffic volume from the server to the core network and then to the eNodeB is sufficient.
If the RX traffic is smaller than the egress traffic of the server, the ingress traffic of the
eNodeB is restricted.
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27. LTE Traffic Fault Diagnosis (Drive Test)
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28. Insufficient traffic volume at the eNodeB ingress is mostly caused by insufficient bandwidth
LTE Traffic Fault Diagnosis (Drive Test)
somewhere in the transmission link.
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29. UDP loopback working principle is: the peer set UDP loopback, the local sends UDP
LTE Traffic Fault Diagnosis (Drive Test)
packets to the peer. The peer reverses the source address and destination address of the
received packets and sends the UDP packets back to the source station. The local side
makes the statistics by returned UDP packets, thus continuity and quality of transmission
can be detected.
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30. LTE Traffic Fault Diagnosis (Drive Test)
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31. LTE Traffic Fault Diagnosis (Drive Test)
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32. LTE Traffic Fault Diagnosis (Drive Test)
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33. LTE Traffic Fault Diagnosis (Drive Test)
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34. LTE Traffic Fault Diagnosis (Drive Test)
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35. LTE Traffic Fault Diagnosis (Drive Test)
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36. LTE Traffic Fault Diagnosis (Drive Test)
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37. LTE Traffic Fault Diagnosis (Drive Test)
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38. LTE Traffic Fault Diagnosis (Drive Test)
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39. LTE Traffic Fault Diagnosis (Drive Test)
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40. The channel/interference check is performed only after the association verification is
LTE Traffic Fault Diagnosis (Drive Test)
passed and you determine that the problem is caused by a channel fault or interference.
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41. LTE Traffic Fault Diagnosis (Drive Test)
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42. LTE Traffic Fault Diagnosis (Drive Test)
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43. Analyze a TCP problem as follows:
LTE Traffic Fault Diagnosis (Drive Test)
If the throughput is stable but cannot reach the peak value, check the window
parameters and RTT.
If the throughput can reach the peak value but is unstable and may suddenly fall to
a low value, check for packet loss and disorder.
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44. Optimization of the sending and receiving windows in Win 7
LTE Traffic Fault Diagnosis (Drive Test)
In Windows 7, the TCP performance is automatically optimized by the TCP auto
tuning function. Start the Windows command line as an administrator and run the
following commands:
netsh int tcp set heuristics disabled
netsh int tcp set global autotuninglevel=normal
If the command is executed successfully, a confirmation message is returned. The
commands take effect immediately. There is no need to restart the computer. You
can run the following command to check the current system configuration level:
netsh int tcp show global
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45. LTE Traffic Fault Diagnosis (Drive Test)
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46. Run the LST TYPDRBPUCCH command to query the SR period of each QCI.
LTE Traffic Fault Diagnosis (Drive Test)
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47. LTE Traffic Fault Diagnosis (Drive Test)
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48. LTE Traffic Fault Diagnosis (Drive Test)
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49. First start the IFTS trace and then start TCP traffic. Stop IFTS trace upon completion of the
LTE Traffic Fault Diagnosis (Drive Test)
TCP traffic and save the .tmf trace file for analysis.
IFTS Trace is used to trace information of a UE served by a specified cell, including S1, X2
and Uu interface information at the control plane and data transmission statistics at the
user plane. The traced information can be saved automatically or manually and viewed
online or offline.
IFTS: Intelligent Field Test System
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50. LTE Traffic Fault Diagnosis (Drive Test)
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