Mobility Management Challenges andMobility Management Challenges and
Issues in 4G Heterogeneous NetworksIssues in 4G Heter...
Technologies
ChallengesChallenges
• Convergence/integration/inter-working of all
existing and emerging fixed and mobile
(w...
The
Internet
IP backbone
Billing
VHE
Signalling
Gateway
WAP Accounting
UMTS
Broadcast Networks
(DAB, DVB-T)
Satellite FES
...
Global coverage
National coverage
Local area coverage
Wireless LANs
DAB and DVB-T, DVB-S
2G, 3G and 4G Cellular
Personal a...
Multi-Agency Seamless Mobility
The Future Home…
DSL/Cable
or MSOTelephone
Wireless
camera
Wireless
media
gateway
NAS for
MP3 & Video
Content
Integrated n...
Success Story @ Work – Madras
Pharma
T.Nagar
Sholinganallur
• Point to Point and Point to Multi Point
• Backhaul spanning ...
Success Story @ Work – Residency Group
Hotels
-Enable Point – to – Point Connectivity ( 1KM )
- Centralized accounting and...
Main BuildingAnnexe
Usman Road
• Point – to – Point Connectivity ( 600 meters )
• Enabling centralized billing and account...
The complexity of the problem: user prospective
From a user prospective
Multiple Heterogeneous
network operators
part of
M...
A Heterogeneous Network Architecture
UTRAN WLAN 4G RAN
PAN
Wireless
Access Network
Core NetworkFuture Internet
Intra-Cell ...
Re-configurable Technology
What does Reconfiguration mean?
“Reconfiguration refers to the software
re-definition and/or ad...
Re-configurable Technology
Benefits
• Users
• Operators
• Manufacturers
- Select network depending on service requirements...
Re-configuration Procedures
Reconfiguration
Trigger
Mode
Identification
Mode
Negotiation
Software
Download
Mode Switch
Dec...
Aggressive frequency re-use ⇒
High spectrum efficiency ⇒
Increased co-channel interference
Downlink Switched Beam Antenna
...
Path Loss and Fading Challenge
Delay
Spread
Rayleigh
Fading
Path
Loss
rapid fading of 20 to 30 dB
(power varies by 100 to ...
4G Cellular Interference
Challenge
0.001
0.01
0.1
1
-5 0 5 10 15 20 25
1|3 reuse
2|6 reuse
3|9 reuse
4|12 reuse
7/21 reuse...
MIMO Measured Channel Capacity
Potential Capacity Relative to a Single Antenna System
• Capacity increase close to 4 times...
Space-Time Coding
OFDM for 4G Wireless
~ 6 kHz
~ 800
tones
~ 5 MHz
• OFDM is being increasingly used in
high -speed information transmission...
Mobility Management Challenges and Issues in 4G Heterogeneous Networks
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Mobility Management Challenges and Issues in 4G Heterogeneous Networks

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Towards 4G
User centric, user controlled services and
context-aware applications
From a user prospective

Multiple Heterogeneous network operators
part of

Multiple user environments
accessed using

Multiple heterogeneous devices



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  • Transcript of "Mobility Management Challenges and Issues in 4G Heterogeneous Networks"

    1. 1. Mobility Management Challenges andMobility Management Challenges and Issues in 4G Heterogeneous NetworksIssues in 4G Heterogeneous Networks ByBy AJAL.A.JAJAL.A.J Towards 4GTowards 4G User centric, user controlled services and context-aware applications
    2. 2. Technologies ChallengesChallenges • Convergence/integration/inter-working of all existing and emerging fixed and mobile (wired and wireless) networks including broadcast • Simple to select and easy to use desired services • Universal and low cost terminals IP Technology Agent Technology Reconfigurable Technology
    3. 3. The Internet IP backbone Billing VHE Signalling Gateway WAP Accounting UMTS Broadcast Networks (DAB, DVB-T) Satellite FES GSM / GPRS Context-aware information Centre IP-based micro-mobility Wireless LANs ISPSIP Proxy Server Inter-Working
    4. 4. Global coverage National coverage Local area coverage Wireless LANs DAB and DVB-T, DVB-S 2G, 3G and 4G Cellular Personal area coverage Hierarchical coverage layers for 4G Satellite Regional coverage Wireless PANs Vertical Handover Horizontal Handover IP-based backbone
    5. 5. Multi-Agency Seamless Mobility
    6. 6. The Future Home… DSL/Cable or MSOTelephone Wireless camera Wireless media gateway NAS for MP3 & Video Content Integrated networks, content, and entertainment systems Managed Security Managed Voice Managed Wireless
    7. 7. Success Story @ Work – Madras Pharma T.Nagar Sholinganallur • Point to Point and Point to Multi Point • Backhaul spanning to 12kms from T.Nagar (H.O) to Sholinganallur (Factory)
    8. 8. Success Story @ Work – Residency Group Hotels -Enable Point – to – Point Connectivity ( 1KM ) - Centralized accounting and reservation system - Hotspot Zones for wireless internet access
    9. 9. Main BuildingAnnexe Usman Road • Point – to – Point Connectivity ( 600 meters ) • Enabling centralized billing and accounting systems Success Story @ Work – GRT Thangamaligai
    10. 10. The complexity of the problem: user prospective From a user prospective Multiple Heterogeneous network operators part of Multiple user environments accessed using Multiple heterogeneous devices owned by heterogeneous users
    11. 11. A Heterogeneous Network Architecture UTRAN WLAN 4G RAN PAN Wireless Access Network Core NetworkFuture Internet Intra-Cell PAN Ad-hoc Network PAN PAN PAN
    12. 12. Re-configurable Technology What does Reconfiguration mean? “Reconfiguration refers to the software re-definition and/or adaptation of every element within each layer of the communication chain.” Baseband Processing User Data A/D Converter D/A Converter RF Front End
    13. 13. Re-configurable Technology Benefits • Users • Operators • Manufacturers - Select network depending on service requirements and cost. - Connect to any network – Worldwide roaming. -Access to new services. - Respond to variations in traffic demand (load balancing). - Incorporate service enhancements and improvements. - Correction of software bugs and upgrade of terminals. - Rapid development of new personalised and customised services - Single platform for all markets. - Increased flexible and efficient production.
    14. 14. Re-configuration Procedures Reconfiguration Trigger Mode Identification Mode Negotiation Software Download Mode Switch Decision Mode Monitoring Reconfigure Terminal Initiated by network operator or user Download software modules that are required for the target What networks are available? What is the most suitable network (based on QoS, user preferences etc.)? Decision on preferred mode
    15. 15. Aggressive frequency re-use ⇒ High spectrum efficiency ⇒ Increased co-channel interference Downlink Switched Beam Antenna SIGNAL OUTPUT INTERFERENCE SIGNAL SIGNAL OUTPUT BEAMFORMER WEIGHTS Uplink Adaptive Antenna SIGNAL INTERFERENCE BEAMFORMER BEAM SELECT Smart antennas provide substantial interference suppression for enhanced performance Smart Antennas for 4G • Key enhancement technique to improve system capacity and user experience • Leverage Smart Antennas currently in development/deployment for IS-136 & GSM
    16. 16. Path Loss and Fading Challenge Delay Spread Rayleigh Fading Path Loss rapid fading of 20 to 30 dB (power varies by 100 to 1000 times in level at rates of about 100 times per second) path loss up to ~ 150 dB (that is a 1 followed by 15 zeroes) Reflected signals arrive spread out over 5 to 20 microsecond
    17. 17. 4G Cellular Interference Challenge 0.001 0.01 0.1 1 -5 0 5 10 15 20 25 1|3 reuse 2|6 reuse 3|9 reuse 4|12 reuse 7/21 reuse Signal to Interference ratio in dB CumulativeProbability Each base station is equipped with three 120 degree directional antennas to reduce interference & improve capacity
    18. 18. MIMO Measured Channel Capacity Potential Capacity Relative to a Single Antenna System • Capacity increase close to 4 times that of a single antenna is possible with 4 transmit and 4 receive antennas • Capacity for pedestrians is similar to mobile users
    19. 19. Space-Time Coding
    20. 20. OFDM for 4G Wireless ~ 6 kHz ~ 800 tones ~ 5 MHz • OFDM is being increasingly used in high -speed information transmission systems: - European HDTV - Digital Audio Broadcast (DAB) - Digital Subscriber Loop (DSL) - IEEE 802.11 Wireless LAN 5 MHz channels ~ 6 KHz tones ~ 13/26 MHz sample rate 2048 FFT size (160 usec OFDM blocks) 256/512 sample OFDM block guard time QPSK & 16-QAM modulation adaptive modulation/coding 1 to 2 msec time-slots in 20 to 40 msec frames Mobile OFDM parameters: ex.
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