15-10-2016, 04:35 PM
[attachment=73142]
INTRODUCTION
Standard: IEEE 802.16
Goal: Provide high-speed Internet access to home and business subscribers, without wires.
Base stations (BS) can handle thousands of subscriber stations (SS)
BS can control all data traffic goes between BS and SS through the allocation of bandwidth on the radio channel.
Supports
Legacy voice systems
Voice over IP
TCP/IP
Applications with different QoS requirements.
Main advantage :
fast deployment,
dynamic sharing of radio resources
low cost
IEEE 802.16 PROTOCOL LAYERING
Like IEEE 802.11, IEEE 802.16
specifies the Medium Access Control
(MAC) and PHYlayers of the wireless
transmission system.
The IEEE 802.16 MAC layer consists
of three sublayers.
MAC PDU FORMAT
The MAC PDU (protocol data unit) is the data unit exchanged between the MAC layers of the BS and its SSs.
Consists of a fixed-length MAC header, a variable-length payload, and an optional cyclic redundancy check (CRC).
MAC Header Formats
Two MAC header formats: The first is the generic MAC header that begins each MAC PDU containing either MAC management messages or CS data. The second is the bandwidth request header used to request additional bandwidth.
SECURITY MECHANISMS
Authentication and Registration
Based on X.509 digital certificates
Access Control
MAC/IP address filtering
VPN at higher layers
Passwords
Privacy
DES with 128 bit key
PKI for key distribution
IEEE 802.16 KEY FEATURES
Broad band wireless access
Up to 50 km
Up to 70mbps
Offers non line of site operation
1.5 to 28 MHz channels
Hundreds of simultaneous sessions per channel
Support point to multi point and mesh network channel
INTRODUCTION
Standard: IEEE 802.16
Goal: Provide high-speed Internet access to home and business subscribers, without wires.
Base stations (BS) can handle thousands of subscriber stations (SS)
BS can control all data traffic goes between BS and SS through the allocation of bandwidth on the radio channel.
Supports
Legacy voice systems
Voice over IP
TCP/IP
Applications with different QoS requirements.
Main advantage :
fast deployment,
dynamic sharing of radio resources
low cost
IEEE 802.16 PROTOCOL LAYERING
Like IEEE 802.11, IEEE 802.16
specifies the Medium Access Control
(MAC) and PHYlayers of the wireless
transmission system.
The IEEE 802.16 MAC layer consists
of three sublayers.
MAC PDU FORMAT
The MAC PDU (protocol data unit) is the data unit exchanged between the MAC layers of the BS and its SSs.
Consists of a fixed-length MAC header, a variable-length payload, and an optional cyclic redundancy check (CRC).
MAC Header Formats
Two MAC header formats: The first is the generic MAC header that begins each MAC PDU containing either MAC management messages or CS data. The second is the bandwidth request header used to request additional bandwidth.
SECURITY MECHANISMS
Authentication and Registration
Based on X.509 digital certificates
Access Control
MAC/IP address filtering
VPN at higher layers
Passwords
Privacy
DES with 128 bit key
PKI for key distribution
IEEE 802.16 KEY FEATURES
Broad band wireless access
Up to 50 km
Up to 70mbps
Offers non line of site operation
1.5 to 28 MHz channels
Hundreds of simultaneous sessions per channel
Support point to multi point and mesh network channel