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Support interactive multimedia services: teleconferencing, wireless Internet, etc.
Wider bandwidths, higher bit rates.
Global mobility and service portability.
Scalability of mobile networks (>10 times the capacity of 3G).
3G vs. 4G From : www.mobileinfo.com All IP (IP6.0) A number of air link protocols, including IP 5.0 IP multi-band adapters Smarter Antennas, software multiband and wideband radios Optimized antenna design, multi-band adapters Component Design Concatenated coding scheme Convolution rate 1/2, 1/3 Forward Error Correction OFDM and MC-CDMA (Multi Carrier CDMA) W-CDMA, 1xRTT, Edge Access Technologies All digital with packetized voice Circuit and Packet Switching Design Basis 100 MHz (or more) 5-20 MHz Bandwidth Higher frequency bands (2-8 GHz) Dependent on country or continent (1800-2400 MHz) Frequency Band 20 to 100 Mbps in mobile mode 384 Kbps to 2 Mbps Speeds Hybrid - Integration of Wireless LAN (WiFi, Bluetooth) and wide area Wide area cell-based Network Architecture Converged data and voice over IP Predominantly voice driven - data was always add on Major Requirement Driving Architecture 4G 3G (including 2.5G)
The 4G mobile network(s) HAPS GSM UMTS WLAN Bluetooth Satellite Wireline or Wireless Networks (Internet) ADSL Home Add. Mobile IP Add. Care-of Add. Care-of Add. Services Content Very wide area Wide area Metropolitan area Local area Personal area Direct Sequence Frequency Hopping WCDMA TD-CDMA TDMA FDD OFDM TDD OFDM Unspecified
One of the most challenging problems facing deployment of 4G technology is how to access several and different mobile and wireless networks
There are two possible architectures
4G Wireless Networks Challenges First Challenge: Accessing Different Networks
First Challenge: Accessing Different Networks 1. Multimode Devices Architecture
A single physical terminal with multiple interfaces to access the different wireless networks
Improve call completion
Expand coverage area
Reliable coverage in case of network, link or switch failure
Complexity in the hardware of the device
Performed by the user, device or network
To reduce the complexity of the hardware in the device the most promising technology is to adapt the software radio approach BPF LNA ADC reprogrammable Baseband DSP User Analogue Digital An ideal software radio system Multimode Devices Architecture (cont.) Analog/digital converter bandpass filter Low noise amplifier
The system tracks and locates a mobile terminal for possible connection
Location management involves handing all the information about
Roaming terminals such as original and current location cells
Second Challenge: Terminal Mobility 1. Location Management
Second Challenge: Terminal Mobility 2. Handoff Management
Maintain ongoing communication when the terminal roams
IP changes during handoff :
184.108.40.206, home address care-of address mobile IP address local network address 220.127.116.11, IPv6 within the same cell: 18.104.22.168, 192.168.5.120
Second Challenge: Terminal Mobility 2. Handoff Management 22.214.171.124, home address care-of address mobile IP address local network address 126.96.36.199, IPv6 when the terminal roams to another cell: 188.8.131.52, 192.168.5.120