Mudasir Ahmad Bhat

4G Definition4G is the fourth generation of wireless mobile

telecommunications technology, succeeding 3G. A 4G system must provide capabilities defined by ITU in IMT Advanced.

4G Networks are projected to provide speed of 100Mbps while moving and 1Gbps while stationary.

3G TechnologyLarge capacity and broadband capabilities

Allows the transmission of 384kbps for mobile systems and up to 2Mbps

Increased spectrum efficiency –5MhzA greater number of users that can be

simultaneously supported by a radio frequency bandwidth

High data rates at lower incremental cost than 2G–Global roaming

Previous Technology - 3GCDMA –Code Division Multiple Access

Form of multiplexing

Does not divide up the channel by time or frequency

Encodes data with a special code associated with each channel

Code Division Multiple Access

IMT-Advanced requirementsBe based on an all-IP packet switched network.Have peak data rates of up to approximately 100

Mbit/sBe able to dynamically share and use the

network resources.Use scale-able channel bandwidths of 5–20 MHz.The ability to offer high quality of service for

next generation multimedia support,LTE Advanced standardized by the 3GPP802.16m standardized by the IEEE (i.e. WiMAX)

Types of MultiplexingFDMA – Frequency Division Multiple Access

Each phone call is allocated one frequency for the entire duration of the call

Types of MultiplexingTDMA - Time Division Multiple Access

Each phone call is allocated a spot in the frequency for a small amount of time, and "takes turns" being transmitted

Types of MultiplexingCDMA - Code Division Multiple Access

Each phone call is uniquely encoded and transmitted across the entire spectrum, in a manner known as spread spectrum transmission

Reasons for New ResearchEven though 3G has successfully been

introduced to mobile users, there are some issues that are debated by 3G providers and users.High input fees for the 3G service

licenses

Great differences in the licensing terms

3G phones are expensive

Fourth Generation

What is 4G?Fourth Generation Technology

Faster and more reliable100 Mb/s Lower cost than previous generationsMulti-standard wireless systemBluetooth, Wired, Wireless Ad Hoc NetworkingIPv6 CoreOFDM used instead of CDMAPotentially IEEE standard 802.11nMost information is proprietary

4G Architecture

Communications ArchitecturePersonal Layer Gateway:

devices that connect to upper layers; cell phone, fax, voice, data modem, MP3 players, PDAs

Info-Sensor layer:environmental sensors

Fiber-optic wire layer: high speed subterranean labyrinth of fiber

optic cables and repeaters

Ad Hoc Networks Spontaneous self

organization of networks of devices

Not necessarily connected to internet

4G will create hybrid wireless networks using Ad Hoc networks

Form of mesh networking–Very reliable

Enhance Mobile GamingExperience enhance wireless

capabilities that deliver mobile gaming interaction with less than five seconds

Play online multi player games while traveling at high speeds or sitting outside

Broadband access in Remote location4G will provide a wireless alternative for

broadband access

I will provide first opportunity for broadband access in remote locations without an infrastructure to support cable or DSL access.

Key featuresMIMO (multi-antenna and multi-user).Frequency-domain-equalization for example multi-

carrier modulation (OFDM) in the downlink.Frequency-domain statistical multiplexing,Turbo principle error-correcting codes: To

minimize the required SNR at the reception sideChannel-dependent scheduling: To use the time-

varying channelLink adaptation: Adaptive modulation and error-

correcting codesMobile IP utilized for mobility