802.16e Protocol Architecture

Traffic (yellow) and Signalling (green) planes of 802.16e standard are shown above.

WiBro Network Architecture

 

WiMax Network Architecture

 

Protocol Layer Structure

Service specific Convergence Sublayer (CS):

• Transformation or mapping of external network data
• Classify external network SDUs and associate them with proper MAC service flow (assigns SFID) and CID. SFID assignement is based on the QOS
• Payload Header Supression ()

MAC Common Part Sublayer (MAC CPS):

• Core MAC functionality of system access
• Bandwidth allocation
• Connection establishment and maintainence
• Classified to perticular MAC conection
• Quality of Service (QOS)
• Scheduling of data over PHY

Privacy Sublayer:

• Providing authentication
• Secure key exchange
• Encryption

Physical Layer (PHY):

• OFDMA,
• MIMO, AAS
• Space Time Coding (STC), Beam Forming
• HARQ
• Adaptive Modulation and Coding (AMC)
• Convolution Turbo Coding (CTC)

What makes WiMax interesting ?

WiMax is a wireless broadband solution that offers rich set of features with lots of flexibility in term of system deployment and service offering. Some of the salient features highlighted below:

- LOS and NLOS communication

- OFDMA based physical layer

- IP based architecture

- High data rate

- Scalable bandwidth

- Adeptive modulation and coding

- Flexible and dynamic per user resource allocation

- Support for Quality of Service

- High level of security

- Mobility

Mobile WiMax and WiBro PHY Specification

Mobile WiMax PHY Specification

Frequency Band	2Ghz-11Ghz for fixed & 2Ghz-6Ghz for mobile application
Channel Bandwidth	Scalable bandwidth between 1.25Mhz to 20Mhz
FFT size	Mobile-28,512,1024,2048 and Fixed-256
Duplexing	TDD and FDD
Multiple Access	SOFDMA
Modulation scheme	QPSK, 16QAM, 64QAM
Frame length	5mSec
Data throughput	~ 70Mbps DL/UL
Mobility	~ 120kmph
Cell coverage	1mile-3mile

WiBro PHY Layer Specification

Frequency Band	2.3Ghz-2.4Ghz
Channel Bandwidth	Scalable bandwidth between 1.25Mhz to 20Mhz
FFT size	8.75Mhz
Duplexing	FDD
Multiple Access	OFDMA
Modulation scheme	QPSK, 16QAM, 64QAM
Frame length	5mSec
Data throughput	~ 50Mbps DL/UL
Mobility	~ 100kmph
Cell coverage	~1km
Channel Codding	CTC(Convolution Turbo Coding)
Key Features	AMC, HARQ, MIMO etc..