Beamforming works by controlling the phase and amplitude of signals sent from each antenna element, allowing signals to be constructively or destructively combined. This allows for the shaping of antenna patterns and directing of beams toward or away from users. There are two types of beams - broadcast beams that define cell coverage and common channel signals, and narrower traffic beams used for user data transmission. Beamforming can be implemented using either reciprocity-based or codebook-based techniques, with the radio node or UE determining beam directions respectively. Both passive and active antennas can perform beamforming if they support multiple ports.
Pci mod3,6,30 analysis and auto optimizationShuangquan Lei
This presentation introduce a network optimization platform, and with this application, system will support you to find 4G LTE cells which have PCI MOD(3), MOD(6) and MOD(30) collision, and then can generate candidate value list by big data analysis.
Please send email to me if this application can make your work more effective.
my email address: lei.shuangquan@gmail.com
Ericsson’s proprietary Lean Carrier innovation is first to address intercell signaling interference, introducing lean design concepts to 4G LTE to improve data speed and app coverage for users while on the road to 5G.
The slides givews an overview of the Ericsson 5G training program for 2018, including fundamentals as well as technical overviews of 5G Core and 5G RAN.
According to WHO: Eelectromagnetic fields of all frequencies represent one of the most common and fastest growing environmental influences, about which anxiety and speculation are spreading. All populations are now exposed to varying degrees of EMF, and the levels will continue to increase as technology advances. A wide range of environmental influences causes biological effects. 'Biological effect' does not equal 'health hazard'. Special research is needed to identify and measure health hazards.
At low frequencies, external electric and magnetic fields induce small circulating currents within the body. In virtually all ordinary environments, the levels of induced currents inside the body are too small to produce obvious effects.
The main effect of radiofrequency electromagnetic fields is heating of body tissues.
Pci mod3,6,30 analysis and auto optimizationShuangquan Lei
This presentation introduce a network optimization platform, and with this application, system will support you to find 4G LTE cells which have PCI MOD(3), MOD(6) and MOD(30) collision, and then can generate candidate value list by big data analysis.
Please send email to me if this application can make your work more effective.
my email address: lei.shuangquan@gmail.com
Ericsson’s proprietary Lean Carrier innovation is first to address intercell signaling interference, introducing lean design concepts to 4G LTE to improve data speed and app coverage for users while on the road to 5G.
The slides givews an overview of the Ericsson 5G training program for 2018, including fundamentals as well as technical overviews of 5G Core and 5G RAN.
According to WHO: Eelectromagnetic fields of all frequencies represent one of the most common and fastest growing environmental influences, about which anxiety and speculation are spreading. All populations are now exposed to varying degrees of EMF, and the levels will continue to increase as technology advances. A wide range of environmental influences causes biological effects. 'Biological effect' does not equal 'health hazard'. Special research is needed to identify and measure health hazards.
At low frequencies, external electric and magnetic fields induce small circulating currents within the body. In virtually all ordinary environments, the levels of induced currents inside the body are too small to produce obvious effects.
The main effect of radiofrequency electromagnetic fields is heating of body tissues.
Physical channel - Each timeslot on a carrier is referred to as a physical channel. Per carrier there are 8 physical channels.
Logical channel - Variety of information is transmitted between the MS and BTS. There are different logical channels depending on the information sent. The logical channels are of two types
Traffic channel
Control channel
BCH Channels
BCCH( Broadcast Control Channel )
Downlink only
Broadcasts general information of the serving cell called System Information
BCCH is transmitted on timeslot zero of BCCH carrier
Read only by idle mobile at least once every 30 secs.
SCH( Synchronisation Channel )
Downlink only
Carries information for frame synchronisation. Contains TDMA frame number and BSIC.
FCCH( Frequency Correction Channel )
Downlink only.
Enables MS to synchronise to the frequency.
Also helps mobiles of the ncells to locate TS 0 of BCCH carrier.
RACH( Random Access Channel )
Uplink only
Used by the MS to access the Network.
AGCH( Access Grant Channel )
Downlink only
Used by the network to assign a signalling channel upon successfull decoding of access bursts.
PCH( Paging Channel )
Downlink only.
Used by the Network to contact the MS.
We are now introducing the industry’s first 5G NR-capable radio, called Ericsson AIR 6468. It features 64 transmit and 64 receive antennas enabling it to support our 5G plug-ins for both Massive MIMO and Multi-User MIMO. The high-performance beamforming, required for Massive MIMO, is enabled through the use of a split Cloud RAN architecture, which brings the required intelligence and scalability to this new radio. And, the AIR 6268 is designed for compatibility with the 5G NR standard while also supporting 4G/LTE.
5G Interview Questions: 50 Questions on Spectrum3G4G
These slides are for information purposes only. The questions asked in this has been covered in other tutorials and opinion videos. The latest PDF version of this document can be downloaded from here: https://www.3g4g.co.uk/5G/5Gtech_Interview0001_Spectrum.pdf
All our #3G4G5G slides and videos are available at:
Videos: https://www.youtube.com/3G4G5G
Slides: https://www.slideshare.net/3G4GLtd
5G Page: https://www.3g4g.co.uk/5G/
Free Training Videos: https://www.3g4g.co.uk/Training/
All components of the 5G platform is in place, we are making our system truly end-to-end with the new products we are introducing. With two new 5G Radios, AIR 6488 and AIR 5121 that, together with the AIR 6468, launched 2016, give us a complete portfolio of 5G radios for Massive MIMO with new mid-band and high-band versions.
5G NR: Numerologies and Frame structure
Supported Transmission Numerologies
- A numerology is defined by sub-carrier spacing and Cyclic-Prefix overhead.
- In LTE there is only one subcarrier spacing which is 15kHz whereas in the case of 5G NR multiple subcarrier spacings are defined. Multiple subcarrier spacings can be derived by scaling a basic subcarrier spacing by an integer N.
- The numerology used can be selected independently of the frequency band although it is assumed not to use a very low subcarrier spacing at very high carrier frequencies. Flexible network and UE channel bandwidth are supported.
- The numerology is based on exponentially scalable sub-carrier spacing deltaF = 2µ × 15 kHz with µ = {0,1,3,4} for PSS, SSS and PBCH and µ = {0,1,2,3} for other channels.
- Normal CP is supported for all sub-carrier spacings, Extended CP is supported forµ=2.
- 12 consecutive sub-carriers form a physical resource block (PRB). Up to 275 PRBs are supported on a carrier.
- A resource defined by one subcarrier and one symbol is called as a resource element (RE).
Physical channel - Each timeslot on a carrier is referred to as a physical channel. Per carrier there are 8 physical channels.
Logical channel - Variety of information is transmitted between the MS and BTS. There are different logical channels depending on the information sent. The logical channels are of two types
Traffic channel
Control channel
BCH Channels
BCCH( Broadcast Control Channel )
Downlink only
Broadcasts general information of the serving cell called System Information
BCCH is transmitted on timeslot zero of BCCH carrier
Read only by idle mobile at least once every 30 secs.
SCH( Synchronisation Channel )
Downlink only
Carries information for frame synchronisation. Contains TDMA frame number and BSIC.
FCCH( Frequency Correction Channel )
Downlink only.
Enables MS to synchronise to the frequency.
Also helps mobiles of the ncells to locate TS 0 of BCCH carrier.
RACH( Random Access Channel )
Uplink only
Used by the MS to access the Network.
AGCH( Access Grant Channel )
Downlink only
Used by the network to assign a signalling channel upon successfull decoding of access bursts.
PCH( Paging Channel )
Downlink only.
Used by the Network to contact the MS.
We are now introducing the industry’s first 5G NR-capable radio, called Ericsson AIR 6468. It features 64 transmit and 64 receive antennas enabling it to support our 5G plug-ins for both Massive MIMO and Multi-User MIMO. The high-performance beamforming, required for Massive MIMO, is enabled through the use of a split Cloud RAN architecture, which brings the required intelligence and scalability to this new radio. And, the AIR 6268 is designed for compatibility with the 5G NR standard while also supporting 4G/LTE.
5G Interview Questions: 50 Questions on Spectrum3G4G
These slides are for information purposes only. The questions asked in this has been covered in other tutorials and opinion videos. The latest PDF version of this document can be downloaded from here: https://www.3g4g.co.uk/5G/5Gtech_Interview0001_Spectrum.pdf
All our #3G4G5G slides and videos are available at:
Videos: https://www.youtube.com/3G4G5G
Slides: https://www.slideshare.net/3G4GLtd
5G Page: https://www.3g4g.co.uk/5G/
Free Training Videos: https://www.3g4g.co.uk/Training/
All components of the 5G platform is in place, we are making our system truly end-to-end with the new products we are introducing. With two new 5G Radios, AIR 6488 and AIR 5121 that, together with the AIR 6468, launched 2016, give us a complete portfolio of 5G radios for Massive MIMO with new mid-band and high-band versions.
5G NR: Numerologies and Frame structure
Supported Transmission Numerologies
- A numerology is defined by sub-carrier spacing and Cyclic-Prefix overhead.
- In LTE there is only one subcarrier spacing which is 15kHz whereas in the case of 5G NR multiple subcarrier spacings are defined. Multiple subcarrier spacings can be derived by scaling a basic subcarrier spacing by an integer N.
- The numerology used can be selected independently of the frequency band although it is assumed not to use a very low subcarrier spacing at very high carrier frequencies. Flexible network and UE channel bandwidth are supported.
- The numerology is based on exponentially scalable sub-carrier spacing deltaF = 2µ × 15 kHz with µ = {0,1,3,4} for PSS, SSS and PBCH and µ = {0,1,2,3} for other channels.
- Normal CP is supported for all sub-carrier spacings, Extended CP is supported forµ=2.
- 12 consecutive sub-carriers form a physical resource block (PRB). Up to 275 PRBs are supported on a carrier.
- A resource defined by one subcarrier and one symbol is called as a resource element (RE).
Design and Analysis of Ku/K-band Circular SIW Patch Antenna Using 3D EM-based...TELKOMNIKA JOURNAL
Substrate Integrated Waveguide (SIW) antennas are considered as main radiators for RF and microwave wireless systems due to their low profile, low cost and soft integration with the other devices. The gain of a SIW patch antenna may be enhanced using different techniques such as Artificial Neural Networks (ANN) by modifying the antenna’s geometry with high efficiency comparing to electromagnetic techniques that take more time. This paper describes a novel structure of a circular SIW patch antenna design using a tree-dimensional electromagnetic (3D-EM) simulation based on ANN model which is developed as an accurate tool for synthesizing the forward side and then analyzing the reverse side of the problem. In this work, ANN algorithms are used for training the samples to provide precise geometrical dimensions of the SIW patch antenna with high accuracy for the target requirements. The antenna is designed to operate in Ku and K frequency bands, resonate at 16.10 GHz and 19.81 GHz respectively and show good performance resulting in low return losses of less than -10dB to -29dB for the selective frequency bands.
Design of Planar Antennas for Wireless ApplicationsAnil Pandey
Planar antennas, including microstrip and printed antennas, metal-plate antennas, ceramic chip and dielectric resonator antennas have a low profile hence, these antennas have extensive applications in mobile systems (such as 900/1800 MHz bands), wireless local area networks (WLANs, such as 2.4/5.2/5.8 GHz bands), ultra-wideband (UWB, such as 3.1 ~ 10.6 GHz band) communications.
Alberto Morello and Vittoria Mignone
DVB-S2 is the second-generation specification for satellite broadcasting – developed by the DVB (Digital Video Broadcasting) Project in 2003. It benefits from more recent developments in channel coding (LDPC codes) combined with a variety of
modulation formats (QPSK, 8PSK, 16APSK and 32APSK).
Compact reconfigurable PIFA antenna for wireless applicationsTELKOMNIKA JOURNAL
This paper presents, new compact and multiband frequency reconfigurable planar inverted-F antenna (PIFA). The antenna is designed and optimized to cover mobile application devices like GPS, WLAN/Wi-Fi, WiMAX, 4G LTE, UWB, and satellite applications. The frequency reconfigurability is obtained by using only a single RF switch (PIN diode) for changing the operating frequency. The antenna dimensions are 45.6x39.6x1.6 mm3 printed on an FR-4 epoxy substrate with relative dielectric constant εr = 4.3, loss tangent tan (δ) = 0.002 and 50 Ω coaxial feed line. The proposed antenna has two patches connected by a single PIN diode. The antenna introduces nine resonant frequencies under (S11 ≤ -10 dB) which are: 0.980 GHz, 3.392 GHz, 3.924 GHz, 4.554 GHz, 5.82 GHz, 6.81 GHz, 7.305 GHz, 8 GHz and 8.105 GHz in the ON and OFF states of the PIN diode which are applicable to cover GSM900, WLAN/Wi-Fi, WiMAX, 4G LTE, UWB, and satellite systems. The obtained maximum simulated gain is 8.45 dB at 6.81 GHz. The lowest return loss is obtained to be -42 dB at 5.854 GHz. Detailed simulation and measurement results are explored and studied in this research. The CST software is used to simulate and optimize the proposed PIFA antenna. The proposed antenna has been fabricated and produced a good agreement with the simulation results.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
1. Ericsson Internal | 2018-02-21
Beamforming -
How does it work
Frank Henschke
Ericsson AG
2019-11-26
2. Ericsson Internal | 2018-02-21
— Antenna are provided with
antenna diagrams (“beams”)
— Each antenna has its own
beam diagram
— Antenna with Electrical tilt are
provided with multiple beam
diagrams, one for each tilt
— But what is behind beam
shape and beam direction?
S(t)
Antenna, sofar…
4. Ericsson Internal | 2018-02-21
Directional Properties
Constructive Interference
= peak in antenna diagram
Destructive Interference
= null in antenna diagram
5. Ericsson Internal | 2018-02-21
— The higher the number of elements:
— The narrower the beam
— The higher the antenna gain
Behindthebeamshape
6. Ericsson Internal | 2018-02-21
Port 1 2 1 2
1 2
Behindthebeamdirection
2 Ports
S(t)
S(t+θ)
θ =π/4
θ =0 θ =π/2 θ =π3/4
Port 1 2
θ =-π/4 θ =-π/2 θ =-π3/4
θ =0
Phase shift between antenna dipoles defines the direction of the beam
S(t)
7. Ericsson Internal | 2018-02-21
— By splitting the antenna in subarrays and sending the same signal with proper amplitudes and phases
to the different subarrays it is possible to dynamically change both beam shape and beam direction
— With beamforming both amplitude and phase are part of the baseband signal processing in the radio
node => the radio node decides both beam shape and beam direction
— By placing multiple arrays of subarrays next to each other the radio node can steer both beam shape
and beam direction in both vertical and horizontal domains
Beamforming
S(t)
S(t)
Ai;
θi
S(t)
Aij;
θi;
φj
S(t) S(t)
S(t)
8. Ericsson Internal | 2018-02-21
MIMO
— According to Shannon formula there is limited gain in channel capacity when SNR is high
— At high SNR it is more efficient to send 2 data streams over channels with lower SNR than sending a
single data stream over a channel having very good SNR
SNR
Cap
SNR1
𝑆𝑁𝑅2 + 𝑆𝑁𝑅3 =
SNR1
C1
C2, C3
C=C2+C3>C1
9. Ericsson Internal | 2018-02-21
— At high SNR the radio node would split power among different data streams in order to exploit MIMO
benefits
— multiple data streams are sent to the antenna, each data stream uses its own channel and a dedicated
set of amplitudes and phases (=beam)
— each beam is emitted with lower power
— SU-MIMO: multiple data stream are sent to a single user for increased user bitrate
— MU-MIMO: multiple data streams are sent towards multiple users for increased system capacity
Beamforming &MIMO
S(t)
Aij;
θi;
φj
V(t)
Aij;
θi;
φj
S(t)
Aij;
θi;
φj
S(t)
S(t)
V(t)
10. Ericsson Internal | 2018-02-21
Definitions andconsiderations
— Active antenna = passive antenna with integrated electronics such as signal amplifiers, analog to
digital converters and other signal processing units
— Beamforming is achieved when the same signal is sent to different (correlated) elements of the
antenna with well defined phases and amplitudes
— Beamforming can be achieved with both passive and active antenna, passive antenna with
multiple ports are required to perform beamforming
2 feeders
Cross
polarized
2T2R
Passive
Antenna
Baseband
Optical
cable
Cross
polarized
2T2R
Active
Antenna
Baseband
Radio
2 layers MIMO OK
Beamforming NOK
The beam is
Antenna HW
dependent
Same Antenna
gain
4 feeders
Cross
polarized
4T4R
Passive
Antenna
Baseband
Optical
cable
Cross
polarized
4T4R
Active
Antenna
Baseband
4 layers MIMO OK
Beamforming OK
The beams are
defined by the
Radio Node
Same Antenna
gain
Radio
8 feeders
Cross
polarized
8T8R
Passive
Antenna
Baseband
Radio
Baseband
Optical
cable
Cross
polarized
32T32R
Active
Antenna
8 layers MIMO OK
Beamforming OK
The Beams are
defined by the
Radio Node
Same Antenna
gain
11. Ericsson Internal | 2018-02-21
Broadcast Beams andTrafficBeams
Beamformingcapableantenna
— There are 2 types of beams:
— Broadcast beam for common channels, always on air, beam is defined by the radio node
— Traffic beams for user data, only on air when there is data to be sent, this is a high gain narrow beam
— Common channels can be sent via multiple narrow beams or a single wide beam, Ericsson implementation
uses a single wide broadcast beam: beamforming is in this case used to achieve the wanted cell coverage, tilt
may apply.
— Broadcast beam has lower ERP than traffic beams
MOM-configurable
sector shape and
digital tilt
HIGHRISE
— Four options available for broadcast beams:
— Macro (providing standard Macro coverage with 60°
Horizontal, 10° Vertical)
— Hotspot (providing coverage to a close area: 60°
Horizontal, 30° Vertical)
— Highrise (providing coverage to a close high rise
building with 20°Horizontal and 30° vertical)
— Customized
12. Ericsson Internal | 2018-02-21
Trafficbeams:whodecides what beamisonair?
— For Traffic beams there are 2 main types of beamforming:
— Reciprocity based beamforming
— The User Equipment (UE) transmits reference signals and the radio node performs channel estimations in
order to define what direction, how many beams to use and which shape
— For SU-MIMO the radio can use up to as many channels/beams as many transmitters are available on the
User equipment
— For MU-MIMO The radio can theoretically use up to as many channels/beams as many transmitters are
available on the Radio
— Codebook based beamforming
— The radio node transmits reference signals and the User Equipment (UE) performs channel estimations in
order to requests specific beam directions to the radio node, the UE can select among a list of 3GPP
predefined beam directions (Precoding codebook)
— The list of predefined beam directions is configuration dependent, it depends on how many antenna
ports/CSI-RS the radio node is configured to transmit
— Any tilt configured on broadcast beams would also affect the traffic beams
— The radio node could forbid utilization of beams in specific directions (codebook restriction for codebook
basedbeamforming) or create nulls in specific directions (reciprocity based beamforming)
13. Ericsson Internal | 2018-02-21
— eNB transmits CSI-RS in DL
— UE measures on the CSI-RS and reports
back CSI
— DL beam forming is based on CSI and
standardized precoding tables.
Closed-loop CSIfeedback
UEspecificbeamforming,LTEexample
Precoder
table
CSI
Works for both FDD and TDD
TM9 (Rel-10)
14. Ericsson Internal | 2018-02-21
Reciprocity basedCSI
UE specific beamforming, LTE example
Works for TDD but not so good for FDD
› UE transmits SRS, sounding
reference signals, in UL
› Different UEs are configured with
different UE specific SRS
configuration
› eNB measures on the SRS and
base DL transmission on that
TM8
15. Ericsson Internal | 2018-02-21
Trafficbeams:whodecides what beamisonair?
— Reciprocity based beamforming via Uplink channel sounding
— UE transmits Sounding Reference Signals (SRS)
— The radio node measures and defines what and how many
beams to send
— Codebook based beamforming via downlink reference signals, so
called “Channel State Information Reference Signals” (CSI-RS)
1. Type 1 CSI codebook:
— Radio node sends CSI-RS signals according to 3GPP, the
UE measures and asks for specific beams out of 3GPP
defined codebooks
— CSI-RS can be pre-coded, non pre-coded
— Suitable for SU-MIMO
2. Type 2 CSI codebook
— High resolution CSI feedback targeting MU-MIMO
16. Ericsson Internal | 2018-02-21
Antenna patterns forreciprocity based beamforming
64T64R
— With reciprocity based beamforming the radio node has access to
all TX ports
— As a consequence there is higher flexibility to shape beams and
point the traffic beam in a wider range of directions
— The picture shows envelope of traffic beams
— Any tilt on the broadcast beam would not have any effect on the
envelope of traffic beams
17. Ericsson Internal | 2018-02-21
Antenna patterns forcodebookbasedbeamforming
64T64R
— In codebook based beamforming the UE sees as many antenna ports as configured by the radio node
through CSI-RS
— each configuration (N1, N2) corresponds to a 3GPP defined amount of possible beams
N1=8
N2=2
N1=8
N2=1
16 port
CSI-RS
32 port
CSI-RS
AIR 6488 Physical Antenna
4
rows
8 columns
Virtual Antenna
example 1
Virtual Antenna
example 2
18. Ericsson Internal | 2018-02-21
CSI-RSconfigurationandnumberofavailablebeams
- Based on 38.214 v15.3-Table 5.2.2.2.1-2: Supported configurations of (N1,N2) and (O1,O2).
Total amount of
available beams
Alternative options
for 32 ports
Number of beams in
the horizontal domain
Number of beams in the
vertical domain
The standard allows
the radio node to
prevent utilization of
certain beams
When multiple beams
are on air power is split
among beams
19. Ericsson Internal | 2018-02-21
— Example of traffic beams envelope for 32 CSI-
RS with 8, 2 configuration (N1, N2)
— Any tilt on the broadcast beam would have
impact on the envelope of the traffic beams
— Example of traffic beams envelope for 8 CSI-
RS with 4, 1 configuration (N1, N2)
— Any tilt on the broadcast beam would have
impact on the envelope of the traffic beams
Codebook basedbeamforming
64T64RAntennapatternexamples
tilt tilt
20. Ericsson Internal | 2018-02-21
— Beamforming is possible with both passive and active antennas
— When the antenna configuration allows for beamforming the antenna patterns become dependent
on SW configuration mainly (within the boundaries defined by the HW)
— It is important to decouple hardware and antenna patterns
— the same antenna could be configured to radiate differently on different sites
— There are 2 types of beams:
— Broadcast beams: defines the coverage area of the cell, traffic is not possible outside of the
coverage area of the broadcast beams
— Traffic beams: use to transmit user data, transmission is focused in the direction of the intended
user which increases signal quality and achievable rate
— Multiple traffic beams can be on air at the same time (MIMO), each beam has lower power
because power is shared among beams
Conclusions andconsiderations
21. Ericsson Internal | 2018-02-21
— Without beamforming power is transmitted in the entire coverage area of the cell, signal to a user
in the cell reaches all other users distributed in the cell
— With beamforming the power is transmitted mainly in the direction of the intended receiver, this
makes the radio environment statistically less polluted which in turns leads to higher achievable
bitrates
Conclusions andconsiderations II
22. Ericsson Internal | 2018-02-21
— With beamforming the instantaneous ERP and the resulting
peak RF EMF levels can be higher than those for traditional
base-station antennas.
— When no time-averaged power is considered the size of the
exclusion zones (i.e. the areas where public access should be
restricted due to RF safety limits) increases. Such increased
EMF compliance boundary makes deployment challenging in
e.g. dense urban environments.
— Ericsson provides a functionality that reduces the time-
averaged power levels to a configurable value, this is achieved
through power back-off
— Exclusion zones are reduced with no impact on coverage and
minimum impact on the capacity of the served cell.
EMFPowerlock
Workers
General
public
Exclusion zone
10 W/m2
ICNIRP public
EMF limit
Exclusion zone
50 W/m2
ICNIRP worker
EMF limit
23. Ericsson Internal | 2018-02-21
— The EMF exclusion zones are reduced as a result of the power back-off and this is beneficial to NR
deployments.
— Coverage is maintained and the impact on capacity is limited to time intervals with averaged power
above the configured value.
Benefits andGains