14-08-2012, 03:56 PM
3G and 4G Wireless – Advances and Challenges
3G and 4G Wireless.ppt (Size: 2.12 MB / Downloads: 160)
Orthogonal Frequency Division Multiplexing (OFDM)
Successor to Frequency Hopping and Direct Sequence CDMA
Capability to cancel multipath distortion in a spectrally efficient manner without requiring multiple local oscillators (802.11a and 802.16)
Based on use of IFFT and FFT
Frequency orthogonality as compared to code orthogonality in CDMA using Walsh Code
Key Mobility Services
Multimedia Messaging Services (MMS)
Text, sounds, images, and video
Transition from Short Message Service (SMS)
Open Internet standards for messaging
Web Applications
Information portals
Wireless Markup Language (WML) with signals using Wireless Application Protocol (WAP)
Location Communications Services
Location Awareness Based
Personalization of information presentation format
Service capability negotiations (MExE environment)
Some Representative Current Wireless Options
Release 99
Release 4
Release 5
Domains, Protocols, and Channels
Radio Resource Management
Network Dimensioning and Optimization
Quality of Service (QoS0 and Location Services
HSDPA
Peak Data rate > 10 Mbps
Same spectrum by both voice and data
Up to 12 spreading codes for High Speed DSCH (HS-DSCH)
Fast link Adaptation
Both code and time division for channel sharing
Transmission Time interval 2 ms
Hybrid Automatic Repeat reQuest (HARQ)
Automatic optimizations to Channel Quality Indicator (CQI)
QPSK and 16 QAM modulation at 3.84 Mhz symbol; spreading factor fixed to 16
Incremental Redundancy or chase combining (CH)
New DPCCH2 in uplink primarily for HARQ channel state info
3.5G Radio Network Evolution
High Data rate, low latency, packet optimized radio access
Support flexible bandwidth upto 20 MHz, new transmission schemes, advanced multi-antenna technologies, and signaling optimization
Instantaneous peak DL 100 Mb/s and UP 50 Mb/S within 20 MHz spectrum
Control plane latency of < 100 ms (camped to active) and < 50 ms (dormant to active)
> 200 users per cell within 5 MHz spectrum
Spectrum flexibility from 1.25 MHz to 20 MHz
Eliminate “dedicated” channels; avoid macro diversity in DL
Migrate towards OFDM in DL and SC-FDMA in UL
Support voice services in the packet domain
Adaptive Modulation and Coding using Channel Quality Indicator (CQI) measurements
3G and 4G Wireless.ppt (Size: 2.12 MB / Downloads: 160)
Orthogonal Frequency Division Multiplexing (OFDM)
Successor to Frequency Hopping and Direct Sequence CDMA
Capability to cancel multipath distortion in a spectrally efficient manner without requiring multiple local oscillators (802.11a and 802.16)
Based on use of IFFT and FFT
Frequency orthogonality as compared to code orthogonality in CDMA using Walsh Code
Key Mobility Services
Multimedia Messaging Services (MMS)
Text, sounds, images, and video
Transition from Short Message Service (SMS)
Open Internet standards for messaging
Web Applications
Information portals
Wireless Markup Language (WML) with signals using Wireless Application Protocol (WAP)
Location Communications Services
Location Awareness Based
Personalization of information presentation format
Service capability negotiations (MExE environment)
Some Representative Current Wireless Options
Release 99
Release 4
Release 5
Domains, Protocols, and Channels
Radio Resource Management
Network Dimensioning and Optimization
Quality of Service (QoS0 and Location Services
HSDPA
Peak Data rate > 10 Mbps
Same spectrum by both voice and data
Up to 12 spreading codes for High Speed DSCH (HS-DSCH)
Fast link Adaptation
Both code and time division for channel sharing
Transmission Time interval 2 ms
Hybrid Automatic Repeat reQuest (HARQ)
Automatic optimizations to Channel Quality Indicator (CQI)
QPSK and 16 QAM modulation at 3.84 Mhz symbol; spreading factor fixed to 16
Incremental Redundancy or chase combining (CH)
New DPCCH2 in uplink primarily for HARQ channel state info
3.5G Radio Network Evolution
High Data rate, low latency, packet optimized radio access
Support flexible bandwidth upto 20 MHz, new transmission schemes, advanced multi-antenna technologies, and signaling optimization
Instantaneous peak DL 100 Mb/s and UP 50 Mb/S within 20 MHz spectrum
Control plane latency of < 100 ms (camped to active) and < 50 ms (dormant to active)
> 200 users per cell within 5 MHz spectrum
Spectrum flexibility from 1.25 MHz to 20 MHz
Eliminate “dedicated” channels; avoid macro diversity in DL
Migrate towards OFDM in DL and SC-FDMA in UL
Support voice services in the packet domain
Adaptive Modulation and Coding using Channel Quality Indicator (CQI) measurements