This document discusses analyzing potential long-term evolution (LTE) signals using the cubic metric (CM) to predict power amplifier (PA) power de-rating. It reviews how CM has been shown to be more accurate than peak-to-average power ratio for various signals. The document proposes a methodology to analyze several proposed LTE uplink signals with varying PAPR and CM using rescaled equivalent bandwidth measurements and an empirical correction to relate them to actual measurement configurations. Table 1 describes the seven signals to be tested, including OFDM, DFTS-OFDM and IFDMA signals with varying modulation schemes and bandwidths.
4G is the fourth generation of wireless mobile telecommunications technology. It provides significantly higher data rates, supports seamless connection of various networks, and offers fully IP-based internet access. Key features of 4G include speeds of up to 1 Gbps, orthogonal frequency-division multiple access (OFDMA) for optimal bandwidth utilization, IPv6 compatibility to support a vast number of devices, and smart antenna technology for seamless handoffs and space division multiple access. 4G aims to deliver an always connected wireless experience with end-to-end quality of service for voice, streaming multimedia, and internet access anytime, anywhere.
The document discusses LTE channels and the MAC layer. It describes the functions of the MAC layer, including mapping between transparent and logical channels, error correction through HARQ, and priority handling with dynamic scheduling. It then provides details on the LTE downlink channels, including both logical channels like PCCH, BCCH, CCCH, and DCCH, as well as transport channels like PCH, BCH, DL-SCH, MCH, and PDCCH.
The document describes the LTE protocol stack, which contains a user plane and control plane. It divides the protocol stack into layers for the radio network and transport network. The physical layer transfers data and performs error detection. The MAC sublayer maps transport channels to logical channels and handles scheduling. The RLC layer provides different reliability modes for data transfer. The PDCP layer performs header compression and ciphering. The RRC layer controls handovers, paging, and radio bearer setup. Transport protocols like IP, UDP, and GTP are used in the fixed network.
Scheduling Algorithms in LTE and Future Cellular NetworksINDIAN NAVY
1) The document discusses scheduling algorithms in LTE and future cellular networks. It provides an overview of key concepts like OFDMA, MIMO, small cells, and the essential elements of LTE including resource blocks and transport channels.
2) It describes important scheduling algorithms used in LTE like proportional fair, round robin, best CQI, and algorithms that consider QoS. The objectives and benefits of different algorithms are explained.
3) Future cellular networks will require capabilities like very high data rates, low latency, and support for applications involving AI, M2M communication, and cloud computing. 5G networks will need to meet requirements like low power consumption and worldwide connectivity.
This slide for your understanding on LTE !
LTE, the wireless access protocol for 4G mobile network service, has evolved from GSM and WCDMA based on 3GPP!
The contents of this slide is below;
I. LTE Introduction
II. LTE Protocol Layer
III. SAE Architecture
IV. NAS(Non Access Stratum) Protocols
V. EPC Protocol Stacks
With my regards,
Guisun Han
This document describes two features called Busy-Hour Download Rate Control and Video Service Rate Adaption. It discusses how these features use DSCP values set by a service awareness device to allow an eNodeB to provide differentiated quality of service for different traffic types like video and downloads. This improves user experience for high priority services during busy hours and for video services by reducing buffering times and freezes.
4G is the fourth generation of wireless mobile telecommunications technology. It provides significantly higher data rates, supports seamless connection of various networks, and offers fully IP-based internet access. Key features of 4G include speeds of up to 1 Gbps, orthogonal frequency-division multiple access (OFDMA) for optimal bandwidth utilization, IPv6 compatibility to support a vast number of devices, and smart antenna technology for seamless handoffs and space division multiple access. 4G aims to deliver an always connected wireless experience with end-to-end quality of service for voice, streaming multimedia, and internet access anytime, anywhere.
The document discusses LTE channels and the MAC layer. It describes the functions of the MAC layer, including mapping between transparent and logical channels, error correction through HARQ, and priority handling with dynamic scheduling. It then provides details on the LTE downlink channels, including both logical channels like PCCH, BCCH, CCCH, and DCCH, as well as transport channels like PCH, BCH, DL-SCH, MCH, and PDCCH.
The document describes the LTE protocol stack, which contains a user plane and control plane. It divides the protocol stack into layers for the radio network and transport network. The physical layer transfers data and performs error detection. The MAC sublayer maps transport channels to logical channels and handles scheduling. The RLC layer provides different reliability modes for data transfer. The PDCP layer performs header compression and ciphering. The RRC layer controls handovers, paging, and radio bearer setup. Transport protocols like IP, UDP, and GTP are used in the fixed network.
Scheduling Algorithms in LTE and Future Cellular NetworksINDIAN NAVY
1) The document discusses scheduling algorithms in LTE and future cellular networks. It provides an overview of key concepts like OFDMA, MIMO, small cells, and the essential elements of LTE including resource blocks and transport channels.
2) It describes important scheduling algorithms used in LTE like proportional fair, round robin, best CQI, and algorithms that consider QoS. The objectives and benefits of different algorithms are explained.
3) Future cellular networks will require capabilities like very high data rates, low latency, and support for applications involving AI, M2M communication, and cloud computing. 5G networks will need to meet requirements like low power consumption and worldwide connectivity.
This slide for your understanding on LTE !
LTE, the wireless access protocol for 4G mobile network service, has evolved from GSM and WCDMA based on 3GPP!
The contents of this slide is below;
I. LTE Introduction
II. LTE Protocol Layer
III. SAE Architecture
IV. NAS(Non Access Stratum) Protocols
V. EPC Protocol Stacks
With my regards,
Guisun Han
This document describes two features called Busy-Hour Download Rate Control and Video Service Rate Adaption. It discusses how these features use DSCP values set by a service awareness device to allow an eNodeB to provide differentiated quality of service for different traffic types like video and downloads. This improves user experience for high priority services during busy hours and for video services by reducing buffering times and freezes.
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.
Orthogonal Frequency Division Multiplexing, OFDM uses a large number of narrow sub-carriers for multi-carrier transmission to overcome the effect of multi path fading problem. LTE uses OFDM for the downlink, from base station to terminal to transmit the data over many narrow band careers of 180 KHz each instead of spreading one signal over the complete 5MHz career bandwidth. OFDM meets the LTE requirement for spectrum flexibility and enables cost-efficient solutions for very wide carriers with high peak rates.
The primary advantage of OFDM over single-carrier schemes is its ability to cope with severe channel conditions. Channel equalization is simplified. The low symbol rate makes the use of a guard interval between symbols affordable, making it possible to eliminate inter symbol interference (ISI).
This document presents a mini project on linear feedback shift registers (LFSRs). It describes how an 8-bit LFSR works using 8 D-flip flops connected in a chain with outputs XORed together. The LFSR generates a pseudo-random sequence that repeats after 255 cycles. It discusses the circuit, working, and timing diagrams of the 8-bit LFSR. Applications mentioned include random number generation, error detection/correction, and implementing cyclic redundancy checks for data transmission.
LTE carrier aggregation technology development and deployment worldwidecriterion123
Carrier aggregation (CA) allows the combination of multiple component carriers to increase bandwidth and throughput. CA can be intra-band, combining contiguous or non-contiguous carriers within a band, or inter-band, combining carriers across frequency bands. Inter-band CA provides more flexibility to utilize fragmented spectrum. The LTE standard defines a maximum of five component carriers for CA. CA improves downlink throughput by increasing bandwidth but may not always increase uplink throughput due to limitations of UE maximum power. Close frequency band CA and FDD-TDD CA require additional RF components to separate signal paths and prevent interference between bands.
This document provides an overview of Synchronous Digital Hierarchy (SDH) including its introduction, components, frame structure, and applications. SDH was developed to provide a standardized digital transmission network with vendor independence. It uses optical fiber to enable end-to-end monitoring and self-healing ring architectures for survivability. The SDH frame structure consists of sections for transport overhead (TOH), path overhead (POH), and payloads. SDH supports multiplexing of various signals like E1, DS1, and STM streams. It allows dynamic bandwidth allocation and is a platform for future services.
The document discusses an LTE training course agenda presented by the OAI Project Team. It covers topics including LTE overview, channels in LTE, cell search procedure, system information, and random access procedure. For each topic, it provides outlines, descriptions, and diagrams. The random access procedure section explains its main purpose is to achieve uplink synchronization and assign a unique UE identifier C-RNTI.
This document provides an overview of a training course on 3G UMTS networking. The course covers topics such as the physical layer, connection establishment, measurements, mobility management, and the UTRAN control protocol. It describes the UMTS network architecture including the core network domains and interfaces. It also discusses radio access network components like the RNC and Node B, as well as key aspects of the WCDMA air interface such as duplexing modes, spreading codes, and handover types. Finally, it introduces concepts like quality of service management in UMTS networks.
This document summarizes forward error correction techniques. It discusses how FEC works by adding redundant data to transmitted messages to allow errors to be detected and corrected without retransmission. It then describes various types of FEC coding including block coding, convolutional coding, turbo codes, and low-density parity check coding. It also discusses how techniques like concatenating codes and interleaving can be used to further reduce errors.
The document discusses various congestion control algorithms and quality of service techniques used in computer networks. It describes approaches like traffic-aware routing, admission control, traffic throttling, and load shedding to control congestion. It also explains how quality of service is achieved through integrated services, differentiated services, and techniques like traffic shaping, packet scheduling, buffering, and jitter control.
TDMA allows multiple users to share the same frequency channel by dividing the signal into different time slots. Each user transmits in brief bursts at periodic intervals, with the time slots being allocated so as not to interfere with each other. Key advantages include efficient use of spectrum and ability to carry voice and data. TDMA networks provide approximately three times the voice channel capacity of analog networks.
This document provides an overview of radio resource management for cellular networks. It discusses topics like call signaling, traffic channel allocation algorithms, interference level measurements, prioritized allocation, queuing parameters and processes for entering and leaving the queue. The document is copyrighted material from Nokia Siemens Networks and cannot be copied or shared without their permission.
This document provides an overview of the LTE1841 Inter Frequency Load Equalization feature. It describes the motivation and goals of the feature, which are to equalize load between inter-frequency cells by maintaining the load difference between partner cells according to a configured delta. The technical details section explains the key aspects of how load is measured and exchanged between cells, how the active mode load equalization state is determined, and the process for candidate UE selection and load equalization execution.
The document summarizes key LTE parameters including RSRP, RSRQ, SINR, RSSI, CQI, PCI, BLER, throughput, latency, tracking area code, timing advance, and transmit power. RSRP measures reference signal power and is used for coverage and path loss calculations. RSRQ measures signal quality near cell edges. SINR measures signal quality accounting for interference and noise. CQI indicates downlink channel quality. PCI identifies cells. BLER indicates block error rate. Latency aims to be less than 10ms for user data and 100ms for control signaling. Timing advance synchronizes uplink transmissions accounting for UE distance from the base station.
This document discusses optimization of networks using drive testing and TEMS software. It provides information on:
1) How drive testing and TEMS can analyze network performance from a subscriber perspective by recording measurement data.
2) The types of information displayed in TEMS windows including cell identity, signal strength, quality, and timing advance measurements.
3) How to use the TEMS software including default tabs, maps, recording properties, and report generation.
This document discusses various causes and troubleshooting steps related to 2G call drops and unsuccessful handovers. It addresses issues like low signal strength, interference, incorrect parameter settings, transmission faults, hardware faults, and more. The key performance indicators of TCH Drop Rate and Handover Failure Rate are defined. Causes of dropped calls on traffic channels include excessive timing advance, low signal strength, poor quality, sudden loss of connection, and other factors. Investigation steps provided include checking error logs, parameters, neighboring cell definitions, transmission quality, antenna installation, and more.
2 g and 3g kpi improvement by parameter optimization (nsn, ericsson, huawei) ...Jean de la Sagesse
The document discusses key performance indicators (KPIs) for 2G and 3G networks and how top telecom vendors like Ericsson, Huawei, and NSN optimize parameters to improve these KPIs. It outlines techniques for reducing TCH blocking, SD blocking, TCH drop, HOSR, TASR, SD drop, and improving paging success rate through actions like changing configuration parameters, enabling features, addressing hardware issues, and optimizing cells physically. The optimization of these parameters can help maintain balance between network throughput, capacity and radio quality while ensuring a seamless transition between 2G and 3G.
The document discusses turbo codes, a type of forward error correction code. Turbo codes use parallel concatenated convolutional encoders with pseudorandom interleaving and iterative decoding. This structure allows turbo codes to achieve error correction performance very close to the theoretical limit defined by the Shannon capacity. Some key advantages of turbo codes are their remarkable power efficiency and ability to support delivery of multimedia services through design tradeoffs. However, turbo codes also have long latency and poor performance at very low bit error rates.
WCDMA uses an OSI model with 7 layers. The lower 3 layers - physical, data link, and network layers - are most important for WCDMA. The physical layer uses different physical channels to transmit data over the air interface. Logical channels define how data is transferred, transport channels define how data is transmitted, and physical channels carry payload data and define signal characteristics. There are three types of channels - logical, transport, and physical - that work together to transmit various types of control and traffic data between the UE and base station.
9 carrier aggregation lte-a new challenges for lab and fieldCPqD
This document summarizes a presentation given by Adryele Neves of Anritsu Brazil on carrier aggregation challenges for labs and the field. The presentation covered Anritsu's wireless test portfolio for addressing these challenges, including signaling testers, a radio communication analyzer, and a mobile device test platform. It also discussed testing needs such as IMS, Wi-Fi offloading, audio quality, and battery life. New challenges in remote radio head deployments were noted along with Anritsu's new battery-powered PIM analyzer for on-site testing.
Carrier aggregation in LTE-Advanced can increase bandwidth and bitrate by aggregating multiple component carriers. Each component carrier can have bandwidth of 1.4-20 MHz, and up to 5 carriers can be aggregated for a total of 100 MHz. Carrier aggregation supports both intra-band aggregation within the same frequency band and inter-band aggregation across different bands. Scheduling in carrier aggregation can occur either on the same carrier or across different carriers.
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.
Orthogonal Frequency Division Multiplexing, OFDM uses a large number of narrow sub-carriers for multi-carrier transmission to overcome the effect of multi path fading problem. LTE uses OFDM for the downlink, from base station to terminal to transmit the data over many narrow band careers of 180 KHz each instead of spreading one signal over the complete 5MHz career bandwidth. OFDM meets the LTE requirement for spectrum flexibility and enables cost-efficient solutions for very wide carriers with high peak rates.
The primary advantage of OFDM over single-carrier schemes is its ability to cope with severe channel conditions. Channel equalization is simplified. The low symbol rate makes the use of a guard interval between symbols affordable, making it possible to eliminate inter symbol interference (ISI).
This document presents a mini project on linear feedback shift registers (LFSRs). It describes how an 8-bit LFSR works using 8 D-flip flops connected in a chain with outputs XORed together. The LFSR generates a pseudo-random sequence that repeats after 255 cycles. It discusses the circuit, working, and timing diagrams of the 8-bit LFSR. Applications mentioned include random number generation, error detection/correction, and implementing cyclic redundancy checks for data transmission.
LTE carrier aggregation technology development and deployment worldwidecriterion123
Carrier aggregation (CA) allows the combination of multiple component carriers to increase bandwidth and throughput. CA can be intra-band, combining contiguous or non-contiguous carriers within a band, or inter-band, combining carriers across frequency bands. Inter-band CA provides more flexibility to utilize fragmented spectrum. The LTE standard defines a maximum of five component carriers for CA. CA improves downlink throughput by increasing bandwidth but may not always increase uplink throughput due to limitations of UE maximum power. Close frequency band CA and FDD-TDD CA require additional RF components to separate signal paths and prevent interference between bands.
This document provides an overview of Synchronous Digital Hierarchy (SDH) including its introduction, components, frame structure, and applications. SDH was developed to provide a standardized digital transmission network with vendor independence. It uses optical fiber to enable end-to-end monitoring and self-healing ring architectures for survivability. The SDH frame structure consists of sections for transport overhead (TOH), path overhead (POH), and payloads. SDH supports multiplexing of various signals like E1, DS1, and STM streams. It allows dynamic bandwidth allocation and is a platform for future services.
The document discusses an LTE training course agenda presented by the OAI Project Team. It covers topics including LTE overview, channels in LTE, cell search procedure, system information, and random access procedure. For each topic, it provides outlines, descriptions, and diagrams. The random access procedure section explains its main purpose is to achieve uplink synchronization and assign a unique UE identifier C-RNTI.
This document provides an overview of a training course on 3G UMTS networking. The course covers topics such as the physical layer, connection establishment, measurements, mobility management, and the UTRAN control protocol. It describes the UMTS network architecture including the core network domains and interfaces. It also discusses radio access network components like the RNC and Node B, as well as key aspects of the WCDMA air interface such as duplexing modes, spreading codes, and handover types. Finally, it introduces concepts like quality of service management in UMTS networks.
This document summarizes forward error correction techniques. It discusses how FEC works by adding redundant data to transmitted messages to allow errors to be detected and corrected without retransmission. It then describes various types of FEC coding including block coding, convolutional coding, turbo codes, and low-density parity check coding. It also discusses how techniques like concatenating codes and interleaving can be used to further reduce errors.
The document discusses various congestion control algorithms and quality of service techniques used in computer networks. It describes approaches like traffic-aware routing, admission control, traffic throttling, and load shedding to control congestion. It also explains how quality of service is achieved through integrated services, differentiated services, and techniques like traffic shaping, packet scheduling, buffering, and jitter control.
TDMA allows multiple users to share the same frequency channel by dividing the signal into different time slots. Each user transmits in brief bursts at periodic intervals, with the time slots being allocated so as not to interfere with each other. Key advantages include efficient use of spectrum and ability to carry voice and data. TDMA networks provide approximately three times the voice channel capacity of analog networks.
This document provides an overview of radio resource management for cellular networks. It discusses topics like call signaling, traffic channel allocation algorithms, interference level measurements, prioritized allocation, queuing parameters and processes for entering and leaving the queue. The document is copyrighted material from Nokia Siemens Networks and cannot be copied or shared without their permission.
This document provides an overview of the LTE1841 Inter Frequency Load Equalization feature. It describes the motivation and goals of the feature, which are to equalize load between inter-frequency cells by maintaining the load difference between partner cells according to a configured delta. The technical details section explains the key aspects of how load is measured and exchanged between cells, how the active mode load equalization state is determined, and the process for candidate UE selection and load equalization execution.
The document summarizes key LTE parameters including RSRP, RSRQ, SINR, RSSI, CQI, PCI, BLER, throughput, latency, tracking area code, timing advance, and transmit power. RSRP measures reference signal power and is used for coverage and path loss calculations. RSRQ measures signal quality near cell edges. SINR measures signal quality accounting for interference and noise. CQI indicates downlink channel quality. PCI identifies cells. BLER indicates block error rate. Latency aims to be less than 10ms for user data and 100ms for control signaling. Timing advance synchronizes uplink transmissions accounting for UE distance from the base station.
This document discusses optimization of networks using drive testing and TEMS software. It provides information on:
1) How drive testing and TEMS can analyze network performance from a subscriber perspective by recording measurement data.
2) The types of information displayed in TEMS windows including cell identity, signal strength, quality, and timing advance measurements.
3) How to use the TEMS software including default tabs, maps, recording properties, and report generation.
This document discusses various causes and troubleshooting steps related to 2G call drops and unsuccessful handovers. It addresses issues like low signal strength, interference, incorrect parameter settings, transmission faults, hardware faults, and more. The key performance indicators of TCH Drop Rate and Handover Failure Rate are defined. Causes of dropped calls on traffic channels include excessive timing advance, low signal strength, poor quality, sudden loss of connection, and other factors. Investigation steps provided include checking error logs, parameters, neighboring cell definitions, transmission quality, antenna installation, and more.
2 g and 3g kpi improvement by parameter optimization (nsn, ericsson, huawei) ...Jean de la Sagesse
The document discusses key performance indicators (KPIs) for 2G and 3G networks and how top telecom vendors like Ericsson, Huawei, and NSN optimize parameters to improve these KPIs. It outlines techniques for reducing TCH blocking, SD blocking, TCH drop, HOSR, TASR, SD drop, and improving paging success rate through actions like changing configuration parameters, enabling features, addressing hardware issues, and optimizing cells physically. The optimization of these parameters can help maintain balance between network throughput, capacity and radio quality while ensuring a seamless transition between 2G and 3G.
The document discusses turbo codes, a type of forward error correction code. Turbo codes use parallel concatenated convolutional encoders with pseudorandom interleaving and iterative decoding. This structure allows turbo codes to achieve error correction performance very close to the theoretical limit defined by the Shannon capacity. Some key advantages of turbo codes are their remarkable power efficiency and ability to support delivery of multimedia services through design tradeoffs. However, turbo codes also have long latency and poor performance at very low bit error rates.
WCDMA uses an OSI model with 7 layers. The lower 3 layers - physical, data link, and network layers - are most important for WCDMA. The physical layer uses different physical channels to transmit data over the air interface. Logical channels define how data is transferred, transport channels define how data is transmitted, and physical channels carry payload data and define signal characteristics. There are three types of channels - logical, transport, and physical - that work together to transmit various types of control and traffic data between the UE and base station.
9 carrier aggregation lte-a new challenges for lab and fieldCPqD
This document summarizes a presentation given by Adryele Neves of Anritsu Brazil on carrier aggregation challenges for labs and the field. The presentation covered Anritsu's wireless test portfolio for addressing these challenges, including signaling testers, a radio communication analyzer, and a mobile device test platform. It also discussed testing needs such as IMS, Wi-Fi offloading, audio quality, and battery life. New challenges in remote radio head deployments were noted along with Anritsu's new battery-powered PIM analyzer for on-site testing.
Carrier aggregation in LTE-Advanced can increase bandwidth and bitrate by aggregating multiple component carriers. Each component carrier can have bandwidth of 1.4-20 MHz, and up to 5 carriers can be aggregated for a total of 100 MHz. Carrier aggregation supports both intra-band aggregation within the same frequency band and inter-band aggregation across different bands. Scheduling in carrier aggregation can occur either on the same carrier or across different carriers.
4 g americas final hspa+ lte carrier aggregation webinar brazilRafael Junquera
This document discusses carrier aggregation of HSPA+ and LTE networks to allow higher data rates by transmitting data simultaneously over both networks. It can take advantage of unused spectrum resources to significantly increase data rates. The most promising architecture involves co-located multi-radio base stations that aggregate data at the base station. HSPA+LTE aggregation is not yet standardized but could provide benefits similar to existing carrier aggregation technologies.
HSPA+ is now available on more than 360 networks across about 160 countries, of which about 160 of the operators have already upgraded to dual-carrier HSPA+ (as of Feb 2014), which delivers peak downlink rates of 42 Mbps. The evolution continuous, bring in more carrier aggregation, HetNets enhancements, even more features to increase the capacity for bursty applications which are characteristic of smartphones and internet of everything (IoE) devices. With all the advancements of HSPA+ evolution, it is one of the important tools for operators to address the looming of 1000x data challenge.
For more information please visit www.qualcomm.com/hspa
Download the presentation here: http://www.qualcomm.com/media/documents/hspa-evolving-long-haul
The document discusses the challenges of providing global LTE connectivity given the many cellular standards, voice modes, and radio frequency bands deployed worldwide. It outlines Qualcomm's solutions to enable seamless mobility across the broadest set of technologies and bands, including integrated multimode chipsets supporting up to 40 LTE and 3G bands along with Wi-Fi, Bluetooth, and GPS. Carrier aggregation is also discussed as a way to accelerate LTE speeds given fragmented spectrum holdings.
LTE Advanced brings carrier aggregation which aggregates fragmented spectrum to provide higher peak data rates, it enables small cell range expansion through advanced interference management techniques like eICIC to allow more users to benefit from small cells, and it continues to evolve through additions like multi-flow carrier aggregation, enhanced heterogeneous networks, and expanding into new areas like device-to-device communications.
The document summarizes key aspects of energy efficient wireless access networks, comparing LTE and LTE-Advanced technologies. It begins with an overview of cellular generations from 1G to 4G. It then discusses energy efficiency in wireless access networks and base station power consumption models. The document analyzes how LTE-Advanced functionalities like carrier aggregation, heterogeneous deployments, and MIMO can improve energy efficiency over LTE. It finds that carrier aggregation and MIMO in LTE-Advanced can increase network energy efficiency by up to 400% and 450% respectively. The document concludes that future networks should implement LTE-Advanced for better energy efficiency compared to LTE.
LTE Advanced is the next major milestone in the evolution of LTE and is a crucial solution for addressing the anticipated 1000x increase in mobile data. It incorporates multiple dimensions of enhancements including the aggregation of carriers, advanced antenna techniques. But most of the gain comes from optimizing HetNets, resulting in better performance from small cells. Qualcomm Technologies has prototyped and demonstrated the benefits of LTE Advanced HetNets at many global events. The first step of LTE Advanced—Carrier Aggregation, was commercially launched in June 2013. It was powered by Qualcomm Technologies' third generation Gobi LTE modems, integrated into Snapdragon 800 solutions.
For more information please visit www.qualcomm.com/lte-advanced
Download the presentation here: http://www.qualcomm.com/media/documents/lte-advanced-global-4g-solution
Carrier aggregation is a technique in LTE-Advanced that allows aggregation of multiple component carriers to increase bandwidth and throughput. It maintains backward compatibility with LTE Release 8 and 9 user equipment by basing the aggregation on existing carriers. Carrier aggregation can be used for both frequency-division duplexing (FDD) and time-division duplexing (TDD). It involves aggregating up to five carriers of varying bandwidths totaling up to 100 MHz maximum. The primary component carrier handles radio resource control signaling and mobility while secondary carriers are added as needed to increase data rates.
Carrier Aggregation - (one) key enabler for LTE-AdvancedAndreas Roessler
Carrier aggregation is the most demanded feature out of the LTE-Advanced (3GPP Release 10) feature set. This feature allows the aggregation of component carrier that for instance reside in different frequency bands. Especially U.S.-based network operator show a strong interest in carrier aggregation, as it is the way out of the very fragmented spectrum allocation here in the U.S. Carrier aggregation is adding some complexity to LTE and of course our customers have an interest to understand the feature in greater detail as well as how our solutions, especially the CMW500, could be utilized to test carrier aggregation. The attached TechPaper is our response to this demand. On 12 pages carrier aggregation is described with all of its aspects, different types and modes, impact on signaling procedures and how to test using Rohde&Schwarz turnkey solutions, including CMW500.
LTE is a common standard covering both FDD and TDD flavors, enableing the industry to build common FDD/TDD infrastructure, common devices, and a large common ecosystem. LTE and its evolution LTE Advanced play a critical role in addressing the 1000x increase in mobile data.
Qualcomm has been leading LTE proliferation from the very beginning— from the industry-first Gobi LTE/3G multimode, common FDD/TDD modems to the current third-generation solutions that powered the world’s first LTE Advanced carrier-aggregation launch in June 2013.
For more information please visit www.qualcomm.com/lte
Download the presentation here: http://www.qualcomm.com/media/documents/lte-qualcomm-leading-global-success
Architectural Options for Metro Carrier-Ethernet Network Buildout: Analysis &...Vishal Sharma, Ph.D.
This workshop is one of the first that we're aware of to give a detailed taxonomy & analysis of deployment options for Carrier Ethernet-based metro/access networks, in one place. We elaborate each option addressing questions like: network architectures possible? Is other supporting technology needed? Or, is it standalone for the applications/services a provider might run, and so on.
Qualcomm: Making the best use of unlicensed spectrumQualcomm Research
In solving the 1000x challenge, licensed spectrum is the foundation. Equally important is utilizing available unlicensed spectrum. The best way to achieve this is to combine both of them through aggregation. Aggregation brings seamless user experience, better coverage and capacity, as well as the efficiencies of a common unified network. Operators have a choice on how to aggregate, and the decision depends on their current assets and future network plans.
Explore our this presentation and other resources to find out when, and how to choose? How can LTE-U coexist fairly with Wi-Fi in 5GHz unlicensed spectrum? What roles existing/new Wi-Fi, and LTE-U play? And whether it really is a "either or" decision.
Webpage: https://www.qualcomm.com/invention/technologies/1000x/spectrum/unlicensed
Download presentation: https://www.qualcomm.com/documents/making-best-use-unlicensed-spectrum-presentation
Sign up for our Technology Newsletter: https://www.qualcomm.com/invention/technologies/wireless/signup
LTE Advanced carrier aggregation, it is possible to utilise more than one carrier and in this way increase the overall transmission bandwidth. These channels or carriers may be in contiguous elements of the spectrum, or they may be in different bands.
Comparative performance analysis of different modulation techniques for papr ...IJCNCJournal
One of the most important multi-carrier tran
smission techniques used in the latest wireless com
munication
arena is known as Orthogonal Frequency Division Mul
tiplexing (OFDM). It has several characteristics
such as providing greater immunity to multipath fad
ing & impulse noise, eliminating Inter Symbol
Interference (ISI) & Inter Carrier Interference (IC
I) using a guard interval known as Cyclic Prefix (C
P). A
regular difficulty of OFDM signal is high peak to a
verage power ratio (PAPR) which is defined as the r
atio
of the peak power to the average power of OFDM Sign
al. An improved design of amplitude clipping &
filtering technique of us previously reduced signif
icant amount of PAPR with slightly increase bit err
or rate
(BER) compare to an existing method in case of Quad
rature Phase Shift Keying (QPSK) & Quadrature
Amplitude Modulation (QAM). This paper investigates
a comparative performance analysis of the differen
t
higher order modulation techniques on that design.
The document summarizes the results of an LTE network simulation for different bandwidth configurations and site grid inter-site distances. It provides key simulation parameters including operating band, transmit power, antenna configuration, scheduling details, propagation model, and SNR curves. The main results are spectral efficiency figures in bps/Hz for various channel bandwidths from 1.4 to 20 MHz and site grid inter-site distances from 500m to 9000m. Some values were modified due to questions about simulator accuracy.
AN OVERVIEW OF PEAK-TO-AVERAGE POWER RATIO REDUCTION TECHNIQUES FOR OFDM SIGNALSijmnct
OFDM (Orthogonal Frequency Division Multiplexing) has been widely adopted for high data rate wireless
communication systems due to its advantages such as extraordinary spectral efficiency, robustness to
channel fading and better QoS (Quality of Service) performance for multiple users. However, some
challenging issues are still unresolved in OFDM systems. One of the issues is the high PAPR (peak-toaverage
power ratio), which results in nonlinearity in power amplifiers, and causes out of band radiation
and in band distortion. This paper reviews some conventional PAPR reduction techniques and their
modifications to achieve better PAPR performance. Advantages and disadvantages of each technique are
discussed in detail. And comparisons between different techniques are also presented. Finally, this paper
makes a prospect forecast about the direction for further researches in the area of PAPR reduction for
OFDM signals
This document provides an outline and introduction to direct sequence spread spectrum (DSSS) and code division multiple access (CDMA). It discusses key concepts such as anti-jam margin, generation of spreading codes, properties of pseudo-noise codes, acquisition and tracking in CDMA systems, CDMA capacity, and throughput efficiency. Advantages of CDMA for satellite networks include interference rejection and asynchronized access, while the main disadvantage is low throughput efficiency.
Comparison of the link budget with experimental performance of a wi max systemPfedya
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Cubuc metric in 3 gpp lte
1. 3GPP TSG RAN WG1 #44 Tdoc# R1-060385
Denver, USA
February 13-17, 2006
Agenda Item
Source: Motorola
Title: Cubic Metric in 3GPP-LTE
Document for: Discussion
Introduction
The conclusion of the original cubic metric (CM) discussion [1] states the peak-to-average power
ratio (PAPR) of a signal does not predict PA power de-rating as accurately as CM. This paper will
expand on the original conclusions by analyzing certain OFDM-type signals that have been considered to
meet the long-term evolution (LTE) goals for 3GPP networks.
Review of the Cubic Metric
A cubic metric has been adopted by the 3GPP members as a method to determine PA power de-
rating because of its accuracy over a wide range of devices and signals. This method has proven to be
superior, for W-CDMA signals, compared to methods that use the statistical PAPR to predict de-rating.
With the introduction of various OFDM-type modulation formats it is crucial that the cubic metric is
verified as a valid predictor of power de-rating.
Data has been collected on several devices for a variety of signals that will show how well the de-
rating of new LTE signals is predicted by CM. Recall the equation to compute the power de-rating via
the cubic metric method:
CM =
[ ]
20 log10 {rms v norm ( t ) } − 20 log10 {rms vref norm ( t ) }
3 3
[ ] dB
K
Where
[ ]
20 log10 {rms vnorm ( t ) } is the called raw cubic metric (in dB) of a signal
3
[ ]
20 log10 {rms vref norm ( t ) } = 1.52 dB is the raw cubic metric of the W-CDMA voice
3
reference signal
rms ( x ) =
( x′x ) v norm ( t ) =
v(t )
to clarify: N , and rms[ v ( t ) ]
In previous work K was empirically determined to be 1.85 for a set of W-CDMA signals.
A new value for K will be determined for multi-carrier signals in this report.
In words, this equation computes the cubic power of a signal v(t), compares it to a reference
signal vref(t) and uses the empirical slope factor K to complete the estimate. Although the signal vectors
are shown as a function of time, the time scale is effectively removed in the rms operation and is not a
part of the computation. Thus the raw CM result is not a function of symbol/chip rate (or alternatively
not a function of signal bandwidth). This can be easily verified by computing the raw cubic metric for a
conventional W-CDMA signal at a 3.84 MHz chip rate, and for the same signal generated at a 7.68 MHz
chip rate. As long as the SRRC filter bandwidth is scaled with the chip rate, an essentially identical
signal is generated at twice the bandwidth, but having the same raw cubic metric. Similarly, a change in
chip rate has no affect on PAPR. Bandwidth effects will be significant to this study since it includes
signals with 3 dB bandwidths larger than the 3.84 MHz used for W-CDMA.
1
2. Bandwidth Considerations
Even though raw cubic metric is not affected by signal bandwidth, the adjacent channel leakage
ratio (ACLR) can be, depending on the definition of the ACLR measurement. This is illustrated in Figure
1 below. The solid shaded boxes represent example spectra of a non-distorted signal and its third order
(cubic) distortion products. The dashed-line boxes represent channel and filter bandwidths and offsets.
The channels and filters in a.) are defined by the 3GPP and are used for all W-CDMA standard
measurements. b.) shows that the frequency overlap between the 3GPP defined measurement filters and
the spectrum of the distortion products increases as the signal bandwidth increases. Comparing a.) and b.)
one can see that ACLR, which is integrated across the measurement filter bandwidth, will be higher for
b.). This will be true even if the relative spectral densities between on channel and adjacent channel
spectra are equal for a.) and b.) simply because the measurement filter is collecting adjacent channel
power over a larger fraction of its bandwidth.
Figure 1 – Considerations for occupied bandwidth in adjacent channel power measurements
|S(f)|
• 3.84 MHz transmitter filter bandwidth
a.) • 5 MHz channel separation
• 3.84 MHz channel power integration bandwidth
f
• 4.51 MHz transmit filter bandwidth
b.) • 5 MHz channel separation
• 3.84 MHz channel power integration bandwidth
f
• 4.51 MHz transmit filter bandwidth
c.) • 5 x 4.51/3.84 MHz channel separation
• 4.51 MHz channel power integration bandwidth
f
Approximate Signal Spectrum 5 MHz channel 3.84 MHz integrated channel power
Approx . Cubic Spectrum 5 x 4.51/3.84 MHZ channel 4.51 MHz integrated channel power
Many of the proposed LTE signals have an increased occupied bandwidth with the goal of
improving spectral efficiency. Since these bandwidth effects are significant, and it has already been
determined that raw cubic metric cannot capture them, a modified technique must be used to study a
signal space that includes signals of different bandwidths. In this new technique all signal measurements
are first rescaled to an equivalent bandwidth. Next the relationship between raw cubic metric and PA
power capability is determined, just as it was in the original W-CDMA cubic metric work. Finally, an
empirical correction is determined that relates the rescaled equivalent bandwidth measurements back to
measurements made using the actual measurement bandwidths and channel spacings deployed.
The diagrams in Figure 1 suggest a simple technique to rescale all the measurements. In a.) one
can observe that only a certain fraction of the third order distortion spectrum falls within the measurement
filter bandwidth, and also that only a certain fraction of the measurement filter bandwidth intercepts any
of the third order distortion power. In b.) both of those fractions have been altered by the increased signal
bandwidth. What is needed is an adjustment that restores both of those fractions to their original values
for the wider bandwidth signal. The adjustment shown in c.) achieves this goal by increasing both the
measurement filter bandwidth and channel separation by the same multiplier. That multiplier is the ratio
of the 3 dB bandwidths being considered. In c.) the study of a 4.51 MHz bandwidth signal is carried out
using a measurement bandwidth of (4.51/3.84) x 3.84 MHz, and a channel separation of
2
3. (4.51/3.84) x 5 MHz. Note that this is for study purposes only. Later in the development results will be
provided for a conventional configuration with 5 MHz channels and 3.84 MHz measurement bandwidths.
Methodology
Several proposed LTE uplink signals with varying levels of PAPR and CM are generated. These
are described in Table 1 below.
Table 1 – Descriptions of LTE Signals Tested
CP Raw CM
Signal Sys Map NFFT Fract NActive Modn BW (MHz) (dB)
A OFDM* PUSC-UL 512 0.25 408 16-QAM 4.51 7.75
B DFTS-OFDM UL 512 0.0625 300 QPSK 4.51 3.44
C DFTS-OFDM UL 512 0.0625 300 16-QAM 4.51 4.85
D DFTS-OFDM UL 512 0.0625 300 64-QAM 4.51 5.18
E IFDMA Full 512 0.25 512 QPSK 3.84 2.40
F IFDMA Full 512 0.25 512 16-QAM 3.84 4.36
G IFDMA Full 512 0.25 512 64-QAM 3.84 4.64
*Results from QPSK and 64-QAM modulations for the OFDM signal are identical to results from 16-QAM modulation; the three
cases can be adequately represented by signal ‘A’ alone
Note that signal ‘A’ is the only modulation of the OFDM type (QPSK and 64QAM have been
omitted). Simulations show that there is no change in PAPR or CM between different modulation
formats of the OFDM system; measurements confirm that there is no power de-rating between the
formats. Only the one modulation case is analyzed here in an effort to avoid artificially weighting data at
any particular CM or PAPR value.
These signals are applied to three different power amplifiers designed for UE applications.
Different PA technologies are represented by two GaAs HBT devices and one GaAs EpHEMT device.
All are 50 ohm matched power amplifier modules representative of current technology.
Table 2 – Description of Power Amplifiers Tested
PA # Description
1 GaAs HBT
2 GaAs HBT
3 GaAs EpHEMT
Each of the 3 power amplifiers are tested with each of the 7 LTE signals and the W-CDMA voice
signal for reference. The input power is swept and the output power level at which the adjacent channel
(± 5 MHz) ACLR reached -33 dB (the linear power capability or LPC) is recorded for each PA and signal
combination1. A rescaled bandwidth-equivalent adjacent channel offset (4.51/3.84 x ± 5MHz = ±
5.87MHz) and measurement bandwidth (4.51/3.84 x 3.84MHz = 4.51MHz) is used for measuring signals
‘A’ through ‘D’ to remove effects of the higher signal bandwidth. Standard measurements using ± 5
MHz channel offsets and 3.84 MHz measurement filter bandwidths are also performed for this set of
signals to determine the bandwidth de-rating component once the raw CM component is known. The
power capability is compared with the W-CDMA signal to determine the relative LPC, or power de-
rating, necessary for each signal and PA combination. In this way, the absolute power capabilities of the
three PA's tested is immaterial; only the signal characteristics affect the results.
1 Note that -33 dB ACLR has been chosen which is consistent with W-CDMA and serves as useful reference value for LTE analysis until
WG4 decides whether ACLR requirements should be changed.
3
4. Results and Analysis
Table 3 shows the output power de-rating for each signal and each device.
Tables 3 & 4 – Measured Relative Power Capability by Signal and PA
Bandwidth Normalized Results Standard Results
Power De-rating Power De-rating
Signal Raw CM PA #1 PA #2 PA #3 Signal Raw CM PA #1 PA #2 PA #3
Ref. 1.52 - - - Ref. 1.52 - - -
A 7.75 3.51 4.08 3.99 A 7.75 4.46 4.93 4.87
B 3.44 1.34 1.63 1.73 B 3.44 2.14 2.29 1.85
C 4.85 1.92 2.26 2.28 C 4.85 2.75 2.89 2.43
D 5.18 2.12 2.44 2.59 D 5.18 3.06 3.07 2.71
E 2.40 - - - E 2.40 0.48 0.45 0.63
F 4.36 - - - F 4.36 1.50 1.74 1.84
G 4.64 - - - G 4.64 1.79 2.03 1.98
(3) (4)
The relationship between the amount of power de-rating and the raw cubic metric is shown below
in Figure 2; the relationship determines the final cubic metric equation (without bandwidth effects). The
points for this plot are taken from Table 3 for signals ‘A’ through ‘D’ and Table 4 for signals E through
G. This corresponds to selecting bandwidth normalized results for the 4.51 MHz bandwidth signals and
standard results for the standard 3.84 MHz bandwidth signals. A linear-best-fit regression line is
calculated and plotted among the data points. The slope of this line quantifies K from the cubic metric
equation for this set of signals. K for this set of signals is different from previous experiments using only
W-CDMA signals (K = 1.56 for LTE vs. K = 1.85 for W-CDMA). Standard error, σy, is 0.23 dB. This
term is the standard deviation of the error between measured data points and the regression line.
To show that CM is superior to PAPR in de-rating prediction, power de-rating vs. the increase in
PAPR over the voice case is plotted in Figure 3. A line with a slope of 1 and passing through the
reference W-CDMA data point, corresponding to predicting the de-rating directly from the increase in
PAPR above the reference signal, is also plotted. Standard error of PAPR prediction is 1.56 dB, on
average more than 1.33 dB poorer than CM prediction.
As described earlier, an empirical correction must be determined for signals ‘A’ through ‘D’ that
relates the rescaled equivalent bandwidth measurements back to measurements made using the standard
method (where actual measurement bandwidths and channel spacings are deployed). The average
difference between the bandwidth normalized measurements and standard measurements is shown in
Figure 4. The average difference, 0.77 dB, is applied as an offset to the regression line from Figure 2.
This offset will be used to modify the CM equation to account for signals of different occupied
bandwidths. One implication of this result is that there is a penalty for increasing spectral efficiency
(increasing signal bandwidth without modifying channel spacing). Methods to mitigate the bandwidth
offset will be discussed in a related report [2].
While this empirical offset only applies to the set of signal and filter bandwidths and offsets
studied in this paper, it is worth noting that the ratio of bandwidths 4.51/3.84 is equal to 0.70 dB. The
proximity of this theoretical value to the empirical 0.77 dB result is probably not a coincidence suggests
an area for further study.
4
5. Figure 2
Power De-rating Prediction Using Cubic Metric
4.50
4.00
σy = 0.227 dB
3.50
3.00 PA #1
Power De-rating (dB)
PA #2
2.50
PA #3
2.00
CM Regression Line
(slope = 1/1.56)
1.50
1.00
0.50
0.00
0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00
Raw Cubic Metric - 1.52 (dB)
Figure 3
Power De-rating Prediction Using PAPR
4.00
3.50
σy = 1.56 dB
3.00
PA #1
2.50
Power De-rating (dB)
PA #2
2.00
PA #3
1.50 PAPR Voice Ref. Line
(slope = 1)
1.00
0.50
0.00
0.00 1.00 2.00 3.00 4.00 5.00 6.00
PAPR - 2.92 (dB)
5
6. Figure 4
ACLR Filter Offset Adjustment
For Bandwidth Normalized Signals
5.00
4.50
4.00
5.0 MHz Filter Offset
3.50
Power De-rating (dB)
3.00 5.87 MHz Filter Offset
2.50
CM Regression Line
(slope = 1/1.56)
2.00
Offset CM Regression
1.50 Line (offset = 0.77 dB)
1.00
0.50
0.00
0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00
Raw Cubic Metric - 1.52 (dB)
Conclusion
• Results show that the prediction accuracy of CM is superior to that of PAPR.
• Measuring the higher bandwidth signals (‘A’ through ‘D’) with scaled adjacent channel
definitions does not give the actual de-rating in real system performance (measurement with
system defined adjacent channel offset). A de-rating increase of 0.77 dB from the CM regression
line can be used to estimate the actual de-rating of higher bandwidth signals. (Note this empirical
offset only applies to the set of signal and filter bandwidths and offsets studied in this paper).
• The amount by which the power capability of a UE power amplifier must be de-rated for LTE
signals with 4.51MHz nominal bandwidth can be summarized by equation (1):
CM =
3
[
20 log10 {rms vnorm ( t ) } − 1.52 ]
+ 0.77 dB (1)
1.56
where 0.77 dB is the increase in CM due to the change in signal bandwidth relative to 3.84 MHz,
if there is no change in relative bandwidth then equation 2 below applies
• The amount by which the power capability of a UE power amplifier must be de-rated for LTE
signals with 3.84MHz nominal bandwidth can be summarized by equation (2).
CM =
3
[
20 log10 {rms vnorm ( t ) } − 1.52]dB (2)
1.56
• The final CM for each signal is shown in Table 5 below and is plotted against measured power
de-rating (using standard measurement method results from Table 4) in Figure 5. The standard
error of the final estimate is 0.187 dB.
6
7. Table 5 – Final CM Summary
Signal Bandwidth
Type Modn Raw CM (dB) K Offset (dB) CM (dB)
WCDMA voice 1.52 - 0.00 0
OFDM 16-QAM 7.75 1.56 0.77 4.76
DFTS-OFDM QPSK 3.44 1.56 0.77 2.00
DFTS-OFDM 16-QAM 4.85 1.56 0.77 2.90
DFTS-OFDM 64-QAM 5.18 1.56 0.77 3.11
IFDMA QPSK 2.40 1.56 0.00 0.56
IFDMA 16-QAM 4.36 1.56 0.00 1.82
IFDMA 64-QAM 4.64 1.56 0.00 2.00
Figure 5
Final CM For LTE Signals
5
4.5
σy = 0.187 dB
4
3.5
Power De-rating (dB)
3
2.5 Measured Data
(standard method)
2 CM Power De-
rating Prediction
1.5
1
0.5
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
CM (dB)
References
[1] R1-040642, “Comparison of PAR and Cubic Metric for Power De-rating”, 3GPP RAN WG1 #37, Montreal 2004.
[2] R1-060144, “UE Power Management for E-UTRA”, 3GPP RAN WG1 LTE Adhoc, Helsinki 2006.
7